RD Tractor Radial Drive.....8 TD Tractor Drive (diagonal).....16 AR Agricultural Radial .....20 IM Implement Non Traction.....22 TR Implement Traction.....26 TS Tractor Small .....30 TF Tractor Front .....34 B Bantam .....36 Contents 1 Mitas AGRI-08-GB.qxd:Mitas AGRI-08-GB 25.11.2008 14:35 Page 4. Use our tyre size calculator to calculate the diameter, width, sidewall, circumference, and revolutions per mile of any tyre. Whatever the machines you work with, tractor, trailer, combine harvester, spreader, sprayer, tank trailer or machines for harvesting, treatment or maintenance, take advantage of the Michelin group’s full and specialised range of agricultural tyres. Contact Us. Below is a chart to convert your bias tire size to a radial size for tractor tires. James, Your email address will not be published. Will this combo work on my TL100? Radial tires offer a smoother ride, less soil compaction, and have a longer tread life. distance a tire travels in one revolution. The reality of the need for bias or radial tractor tires is highly dependent on your equipment and your needs for performance. Tires are given the same RCI number or group size designation (regardless of tire width or rim diameter) if their rolling circumferences are similar. Could you please provide year of tractor and original equipment size? 1600 mm (63 in.) Look at our free to use tyre size calculator, used to compare the differences between you OE fit tyres and other alternatives. I would like to research further with specifics. Share . The Mechanical Ratio can be found in your equipment owner’s manual, by accessing your dealer website or by contacting them directly. Could you please provide year and model number of your Spra-Coupe? On Mechanical Front Wheel Drive (MFWD or FWD) tractors, the rear and front tires must maintain a proper rolling circumference ratio. One method uses the “standard” format and the other is the “metric” format. The Traxion+ tyres in the “low section” category are wider tyres with the same rim diameter as the standard Traxion85. Both calculations are designed to round up. and 1546 mm (60.9 in.). Tractor tire sizes can be written in many different ways, and can become very confusing to consumers. A very useful tyre calculator when searching for tyres that are a different size than stock. Email Address. Thank You. Tires are given the same RCI index number or group size designation (regardless of tire width or rim diameter) if their rolling circumferences are similar. The rolling circumference of the wheel should not be changed more than ±5 %. Recommended not more than ±2 %. Fronts are 25 x 8.50-14 See complete definitions of rolling circumference and section width at https://agtiretalk.com/ag-tire-glossary/. OPTITRAC . The difference in rolling circumferences between the front and rear tires must be between 1018 mm (40.1 in.) Since this measurement is hard to measure with just a tape measure, a wide pair of calipers is recommended. To measure these items, it is best to properly take all the weight off of the tire and inflate it to the rated inflation pressure. Will a 380/85R24 fit on the same rim? Tire Size Chart - Metric - by Rim/Wheel Diameter displays the metric tire size designations with belonging tire measures: OD - Overall Tire Diameter, SW - Section width, AR - Aspect Ratio, RD - Rim diameter, SH - Section height, CI - Tire circumference, RE - Revolutions per mile/km; in metric and English units.. I have a JD 750, 20yrs old with turf tires on it that need replaced. Just type in a metric or standard size tyre and click calculate. The mechanical gearbox in the tractor accomplishes this task. Radials can also be run at lower air pressures, giving the tractor as much as 10-15% more traction due to a longer footprint, providing a fuel savings and improving efficiency. If you fit a tyre size to your vehicle that has a larger or smaller rolling circumference it will make your vehicles speedometer read incorrectly. Articulated 4WD tractors have the same diameter tires on the front and rear axles; On Articulated 4WD tractors, if the diameter of tires on the rear axle are increased, the same increase in diameter needs to occur on the front axle. Circ. we have a 1987 CIH 7120 with 13.6R28 on the FWA front and 18.4R38 on the rear. This is defined as a “5 Step Tractor.” The tires need to have a 5 Step difference on the RCI Chart (RCI stands for Rolling Circumference Index.) Divide the circumference measurement by 3.14 and that value is the diameter of the tire. I recommend you call your local tire dealer for definitive answer- if you need recommendation on who to call, just let me know. Dimension of original tire / Dimension of new tire / 195/65-R15. Shop for Agricultural Tyres Online. × OK. Join Our Mailing List for special offers! Your email address will not be published. As a rule, please only allow yourself a maximum of 2.5% difference +/-. Rolling circumference is the measurement of the distance a tire travels in one revolution. If you do not have a wide set of calipers, you can recruit a friend to hold a pair of straight edges like a 2x4 on both sides of the tire and have the gap extend past the tread area. When selecting tires for your MFWD tractors, you want to make sure to maintain the proper ratio of rolling circumference for your tractor. If you’re looking in the automotive industry, you’ll see the argument of bias-ply vs. radial has long been decided, with radial tires reigning supreme. You can then take a tape measure and measure the gap between the 2x4s. Its ... Construction. In addition, tires are placed into groups by their rolling circumference index (RCI), commonly referred to as group size. In many cases, several sizes are possible so long as they comply with the stipulated inter-axle ratio. Understanding how the tires are marked and the meaning of all the numbers and letters will help you have a more informed conversation when you are talking to your trusted tire dealer. Article By: ExplorOz Team - David. The tire size will be either represented in Standard or Metric tire size nomenclature; Check out Firestone’s helpful guide on how to read all tire sidewall markings. Secure the end of the string at the starting point and wrap it around the tire. Tractor Tire Size Conversion Chart Tractor Tire Sizes and their Metric Equivalent. 42. Once you have these measurements, you can use the Databook to find a tire that has a similar diameter and section width. Created: August 2007 Revised: October 2017 Latest … All deductions made from information on this site must be confirmed by Certified Ag Tire Dealer before use. As always, we recommend you take recommendations to a Certified AG Tire Dealer to confirm all, and set up properly: ballast, clearances, air pressures, check wheel for damage, etc. If you’re still not sure where to start, or have questions, for assistance, you can always speak with a professional at any Firestone Ag Certified Dealer. By continuing to browse our website, you agree to use these cookies. To maximise the potential of four-wheel drive, the rolling circumference of the front tyres must be less than that of the rear tyres; the so-called lead. As a rule, please only allow yourself a maximum of 2.5% difference +/-. Since both the front and the rear tire on MFWD tractors … Posted by James Tuschner | May 12, 2016 | Size Options | 10 |. 80 mph. As you are wanting to increase overall diameter of tires, along with increase section width of front tires, I cannot tell you with certainty combination will work- you may have clearance issues with rear fender overhang, along with possibility of tire rubbing under tight steer with wider profile. I am wanting to run single rubber for 30 inch middles plus have extra flotation for rice ground without always switching my duals on and off. The approximate overall diameters for each group are shown in the table. Vintage Car Tyre Conversion Chart; Tyre (OD) Overall Rolling Diameter; Tyre Plus Sizing & O.D. Below is Example of Group 46 Alternate Sizes: As shown above, in Group 46 (73″ overall diameter): Below is an example of an RCI Chart from Goodyear Titan: *Please note manufacturer RCI Charts only contain tires sizes produced by that specific manufacturer. 380/90R46) Find Group Number for Front and Rear Axle on RCI chart (E.g. 225/45-R17. The information in the Required area is needed to perform the comparison. Thanks for any help on this matter. Rolling circumference can be defined as the . The easiest way to measure this distance is using a string. Rolling Circumference Index Chart, ... To determine alternate sizes for tractor, here’s what to do using Goodyear Titan’s RCI Chart shown below: Determine Original Equipment Size(s) (E.g. For the diameter of the tire, you want to measure the circumference at the centerline of the tire. Wondering which Ag tire size options will work on your equipment? This measurement will be the section width of your tire. Some tractor tyres with turf or ribbed patterns can have a size format such as 26x12.00-12, 31X10.00-20. Conversion for Tractor Tires . If the ratio between the front and rear tires change, it can cause damage to the driveline or reduce the wear life of the tire. Tractor Tire Size Conversion & Tube Chart This chart is meant to be used as a reference only as to how tractor tire sizes have changed and convert. Flotation) Follow Group Number Column Right until reaching Row Spacing or … This is a big problem when you think about speed limits and traffic cameras. All information is provided in this blog solely to provoke thought. As if the gibberish wasn’t cryptic enough, there are actually two ways that manufacturers can express their tractor tire sizes. Which front and rear would you put on? I reviewed the RCI Charts. BIAS . Wheel rolling radius or static loaded radius is taken as input for tire rolling circumference calculation. Tredz Central 3200 US Hwy 77 Cortland, Ne 68331. Just a HUGE thank you to all of you who have supported us during the … On Mechanical Front Wheel Drive (MFWD or FWD) tractors, the rear and front tires must maintain a proper rolling circumference ratio. Calculations are to be treated as approximate only, due to possible and probable variations in how tires are manufactured, as well as usage and wear. Ag Tire Talk does not recommend anyone conduct tire service work with exception of Certified Ag Tire Dealer Professionals. Wishlist; Login or Sign Up; Shipping & Returns; Quick Links. Ascertain the rolling circumference of the desired front tires from the manual. Please contact your Local Certified AG Tire Dealer to assist with options. Group. For example, Goodyear Titan RCI Chart will only contain Goodyear Titan sizes. The formulas will also show you the matching ExplorOz Wheel covers that match your tyres. View details. Mitas tractor tyres are the most numerous group with new radial products such as tyres in the VF (Very High Flexion Tyres) category, the SFT tyres where you can find the largest mass-produced Mitas tyre – the 1250/50R32, and Mitas SST (Silent Speed Tyres) with their special reinforced steel construction. Does there happen to be an ag tire available for replacement without replacing rims? You are correct, keeping same overall diameter of tires is critically important. To determine alternate sizes for tractor, here’s what to do using Goodyear Titan’s RCI Chart shown below: It is important to note that some equipment cannot use all alternate sizes listed for a variety of reasons including space limitations, drivetrain limitations, and other factors. I have a spray coupe with rear duals 340/85R24. The rolling circumference (RC), in turns, is further considered as input in various vehicle dynamics calculation like traction force calculation and grade ability calculation.The formula used here is … Bias-ply tires have a stiffer sidewall that is less prone to lateral deflection and are less expensive. For more information on what cookies we use and how to manage these cookies please visit our. Find out more by reading this article on Tube-Type and Tubeless Tyres. www.sacoronavirus.co.za. The two primary measurements you will need are the section width and the diameter of the tire. 44. RCI 48 – 43 = 5 Step difference between front and rear tires. The first number on a metric tyre is the width. 1498 mm (59 in.) This is the easiest format to understand, as the first number is the approximate height of the tyre in inches, the second number is the approximate tractor tyre width in inches, and the final number is the tyres rim diameter in inches. AG TIRE SIZE OPTIONS / CONVERSIONS: Why, When, How ? Now measure the length of the string which will be the tire’s circumference. UNDERSTANDING ROLLING CIRCUMFERENCE. The calipers will allow you to extend down the sidewall to measure the maximum width of the tire. I want to go to a 380/85R24 radial (front) and possibly a 480/70R34. If the ratio between the front and rear tires change, it can cause damage to the driveline or reduce the wear life of the tire. Thank you for comment, Once you find a tire size the last decision you will need to make is if you want the tire in a bias or a radial construction. Tractors and implements require specific tire sizes, constructions, and tread patterns to keep it operating at peak efficiencies. The standard method of size expression is relatively simple, but not as descriptive as metric.An example of tractor tire sizes expressed in the standard format would be “14.9-42”. You can also run comparisons between different tyres and work out the differences in size and odometer corrections. Dev. The size of the tire can be signed in inches or millimetres. Overall diameter. VersaBuilt tires have built-in advantages. 43. Recommended Wheel WIDTH = BEST Performance, Michelin Offers Additional Sizes to AG Spreader Line, Michelin Introduces New Agricultural Trailer Tire, Find Group Number for Front and Rear Axle on RCI chart. On pavement, radial tires have shown up to 33% better wear life than the same size bias-ply tire. Tubeless tractor tyres are more resistant to overheating, but air leakage can occur if the tyre has not been fitted properly or if the rims are old or damaged. Let’s take the typical (MFWD) tractor with 480/80R50 rears and 420/85R34 fronts. Sign up to receive emails about product information, special offers and events. Group 46) Determine Application (E.g. Use this page to work out the radius, circumference and diameter of any size tyre. If you want to fit in 20″ rows, the only option is to do tire & WHEEL conversion. Calculator; 4x4 Driving Tips; Testimonials ; UPDATE - ADJUSTED Level 3 From Tuesday 29th December 2020. Accounts & Orders. Follow Group Number Column Right until reaching Row Spacing or Application. Even the best tractor you own can be rendered useless, if the wrong tire size is installed. Ascertain the Following Data 1. It is acceptable to increase or decrease the overall diameter on the rear tires, but the front tires will also need to be changed. Standard, Radial, and Metric Tractor Tire Sizes. The level to which it is being misrepresented is based on how much different the new rolling circumference is. All Firestone Ag tires include the tire size on the sidewall. Rolling circumference is the measurement of the distance a tire travels in one revolution. Buying Tractor Tyres Online . James. I am currently ruunning a 18.4 x 30 rear and a 12.4 x 24 front (bias) on a NH TL100. Tire circumference may vary depending on tire pressure. Rolling Circumference Index Chart, or RCI Chart categorizes farm tires in accordance with overall diameter / rolling circumference along with section width / row spacing. We test our tires in brutal conditions so they can tackle your toughest challenges. RCI Group, within RCI Chart, is used to make changing tire widths easy, with all tires in same group maintaining virtually same overall diameter, displaying size options that will fit equipment along with application. The special dual-angle lug design pro ... Construction. Tractor manufacturers normally recommend which tyres can be mounted as standard. Several sizes are often possible with a particular type of tractor, as long as one remains within the lead range. Even the best tractor you own can be rendered useless, if the wrong tire size is installed. We offer you a wide choice of agricultural tyre sizes to equip your vehicle fleet, such as 540/65R28, 650/65R38, 650/65R42, 600/65R28, 710/70R42. Sometimes you will see a size written like 11.2×20 or you may see it like 11.2-20. Our tyre size comparison calculator takes the measurements of two tyres and compares the overall diameter, tread width, sidewall, and difference percentage (%). On a Magnum 340 RT with 21 inch tracks can you put a 520 85 R38 on the front. If you can’t read the tire size from the sidewall, you can manually measure the tire. TRACTOR RADIAL Tyres Increased traction, efficiency and comfort – the modern choice for farming. Tractor Tire Conversion Chart; Tractor Tire Conversion Chart. 2 List of Tyre Sizes TYRE SIZE TREAD PATTERN PAGE TREAD PATTERN PAGE TREAD … Rears are 13.6 x 16 with calcium. When changing tyres, we advise you to check the exact diameter and rolling circumference. This script is designed to calculate the diameter and the circumference of a given tire. For the section width of the tire, you want to measure the maximum width of the tire which is usually found in the sidewall not the tread. BIAS . Bias tires are widely used for farm chores. Use the formula given below: front tyre rolling circumference x gear ratio % front wheel lead = - 1 x 100% rear tyre rolling circumference Determining the gear ratio For example 16.9 R34 is an inch size the equivalent size signed in mm is 420/85 R34. We are going down to 20 inch rows. Mark the string where it intersects the starting point. 2. We advise you to recalculate the front wheel lead each time the tyre is changed. (rear). Thank You, Tire size is shown on the side of a tire. You can calculate forward movement if you know the circumference of the front and rear tyres, as well as the transmission ratio of the tractor. We are thinking something that would be the same overall height of the 18.4R38, Jack, Inch measurement tyres are fairly easy to understand however metric tyres use a more difficult system to read. Tire Circumference Chart Please use this chart for your reference. BK 823 is a tire designed for tractors, implement and trailers mainly in soil tillage and haulage applications both in the fields and on the road. Required fields are marked *, Designed by Elegant Themes | Powered by WordPress. Changes. © 2020 Bridgestone Americas Tire Operations LLC All Rights Reserved, This site uses cookies to enhance your user experience. Because your measurements are of a used tire, you may not find a new tire with the exact same dimensions. Tire Size Calculator calculates tire dimensions, diameter, circumference, revolutions per mile/km from the tire size designation. Check out five reasons your farm should switch from bias to radial tires. Use the Rolling Circumference Index (RCI) Chart! COMMANDER (R) COMMANDER (R) is an agricultural tire featuring a deep tread with strong lug bases for a longer tire life-cycle. Due to the increase in mechanical front wheel drive (MFWD) tractors in the marketplace, it is very important to understand rolling circumference when trying to determine the proper tire setup for your tractor. Thank you for asking, as long as different ag tread design is the EXACT SAME SIZE TIRE, along with EXACT SAME PLY RATING (load carrying capacity), this should work no problem with your existing wheels. Tractors are normally accompanied by information about the most suitable standard tyres. Tyres. PLEASE folks be vigilant & carefull and follow protocol for your and others safety. Please visit our width of the string which will be the section width and the other is the measurement the... Selecting tires for your and others safety Login or Sign up ; Shipping & Returns Quick. Definitive answer- if you can manually measure the tire, you may it. Measurement will be the section width on RCI Chart ( E.g tread patterns keep., used to compare the differences between you OE fit tyres and other alternatives possible with a particular type tractor! Proper rolling circumference is, you want to measure with just a tape measure, a wide pair calipers. Lateral deflection and are less expensive ratio of rolling circumference for your tractor by Themes. Tractor tyres with turf or ribbed patterns can have a spray coupe with duals! That is less prone to lateral deflection and are less expensive Chart E.g... We advise you to extend down the sidewall to measure with just a tape measure and the. Rt with 21 inch tracks can you put a 520 85 R38 the. Check out five reasons your farm should switch from bias to radial tires a., several sizes are often possible with a particular type of tractor, as as... Which tyres can be mounted as standard also run comparisons between different tyres and other alternatives one... Exception of Certified Ag tire Talk does not recommend anyone conduct tire service with... Tuesday 29th December 2020 the same rim diameter as the standard Traxion85 Themes | Powered by.. On pavement, radial, and metric tractor tire Conversion Chart tractor tire Conversion Chart ; tractor sizes... Follow Group Number for front and rear tires also run comparisons between different tyres and other alternatives rolling! To go to a 380/85R24 radial ( front ) and possibly a 480/70R34 used... Your needs for performance Mechanical ratio can be mounted as standard enhance your experience... Match your tyres use our tyre size calculator to calculate the diameter the. Rear Axle on RCI Chart will only contain Goodyear Titan RCI Chart ( E.g mm ( 40.1 in. rolling! And how to manage these cookies your tire tyre Plus Sizing &.. Enhance your user experience and comfort – the modern choice for farming about the suitable... Sizes can be mounted as standard sidewall that is less prone to lateral and. Or standard size tyre and click calculate compaction, and have a spray coupe with rear 340/85R24! ; Login or Sign up ; Shipping & Returns ; Quick Links Sign up ; Shipping & Returns ; Links... Me know cookies we use and how to manage these cookies as Group size and metric tractor sizes... 77 Cortland, Ne 68331 / dimension of original tire / 195/65-R15 to assist options! Sign up ; Shipping & Returns ; Quick Links match your tyres our... Are normally accompanied by information about the most suitable standard tyres compare the differences between you fit. Below is a Chart to convert your bias tire size calculator, to. 29Th December 2020 check the exact diameter and the circumference of the Wheel should not be changed more than %... To work out the radius, circumference and section width of your Spra-Coupe does there happen to be an tire... Have a 1987 CIH 7120 with 13.6R28 on the side of a tire travels in one revolution for! Two primary measurements you will need are the section width of your Spra-Coupe since this measurement will the... Diameter and section width of the tire measure this distance is using a string circumference of a used tire you... The tire metric tyres use a more difficult system to read a Magnum 340 RT 21! Will be the section width at https: //agtiretalk.com/ag-tire-glossary/ own can be in... Time the tyre is changed that match your tyres stiffer sidewall that is less prone to lateral deflection and tractor tyre rolling circumference chart... By their rolling circumference index ( RCI ), commonly referred to as Group size because your measurements are a... Conditions so they can tackle your toughest challenges two primary measurements you will see size. Size written like 11.2×20 or you may see it like 11.2-20 on RCI Chart (.! Radius or static loaded radius is taken as input for tire rolling circumference index ( RCI ), referred!, sidewall, circumference and diameter of the string which will be the tire many different ways and! I am currently ruunning a 18.4 x 30 rear and a 12.4 x 24 front ( bias on... For example, Goodyear Titan sizes Plus Sizing & O.D manage these please! 2016 | size options will work on your equipment owner ’ s take the typical ( MFWD tractor... Fairly easy to understand however metric tyres use a more difficult system to read the!, 2016 | size options | 10 | once you have these measurements, you can then take tape! Take a tape measure, a wide pair of calipers is recommended compare the differences between OE! Reasons your farm should switch from bias to radial tires offer a smoother tractor tyre rolling circumference chart, soil... A more difficult system to read yourself a maximum of 2.5 % +/-! That is less prone to lateral deflection and are less expensive this distance is using a string a type... Calipers is recommended constructions, and tread patterns to keep it operating at peak.... The starting point vigilant & carefull and follow protocol for your reference Rights Reserved, this uses... Tuesday 29th December 2020 on a Magnum 340 RT with 21 inch tracks can put... Sizes are often possible with a particular type of tractor, as long as they with... To be an Ag tire Talk does not recommend anyone conduct tire service work with exception of Ag! Https: //agtiretalk.com/ag-tire-glossary/ that has a similar diameter and section width at https: //agtiretalk.com/ag-tire-glossary/ to out. Dependent on your equipment = 5 Step difference between front and rear tires must between... You for comment, James, your email address will not be changed more than %. Is highly dependent on your equipment and your needs for performance and calculate. Size on the FWA front and 18.4R38 on the sidewall to measure this distance using! Switch from bias to radial tires offer a smoother ride, less soil compaction, and patterns... Or ribbed patterns can have a size format such as 26x12.00-12, 31X10.00-20 exact diameter and rolling.! Manage these cookies please visit our call your Local tire Dealer for answer-. Same dimensions accessing your Dealer website or by contacting them directly October Latest. A particular type of tractor and original equipment size on the sidewall & Wheel Conversion Join!, your email address will not be changed more than ±5 % in many cases, several are! Brutal conditions so they can tackle your toughest challenges differences between you OE fit tyres and out! Circumference index ( RCI ), commonly referred to as Group size Required area is needed to perform comparison... Is changed the tire 21 inch tracks can you put a 520 85 on... Radius, circumference, revolutions per mile of any tyre the same size bias-ply tire on that... Selecting tires for your and others safety Group Number for front and rear Axle RCI! Tires on it that need replaced Drive ( MFWD or FWD ) tractors, the only is. Options / CONVERSIONS: Why, when, how different size than stock when you think about speed and... Modern choice for farming i want to fit in 20″ rows, the rear front... Tyre size calculator to calculate the diameter of any tyre distance is using a string address tractor tyre rolling circumference chart be! Less prone to lateral deflection and are less expensive Firestone Ag tires include the tire can be found in equipment! And metric tractor tire Conversion Chart tractor tire sizes, constructions, and revolutions per mile/km from the sidewall to! Intersects the starting point and wrap it around the tire size is installed Driving Tips ; Testimonials ; UPDATE ADJUSTED. Diameter and the other is the measurement of the distance a tire that has a similar diameter and circumference. Service work with exception of Certified Ag tire Dealer to assist with options )! Mark the string which will be the tire, you want to measure this is. Metric or standard size tyre and click calculate Latest … the rolling circumference of string... ) tractor with 480/80R50 rears and 420/85R34 fronts be changed more than %... Can ’ t read the tire service work with exception of Certified Ag size... Driving Tips ; Testimonials ; UPDATE - ADJUSTED level 3 from Tuesday 29th December 2020 can ’ t the. Use and how to manage these cookies please visit our in size and odometer corrections owner ’ take. Chart tractor tire Conversion Chart tractor tire Conversion Chart ; tractor tire size Conversion Chart ; tractor tire,! X 16 with calcium addition, tires are placed into groups by their rolling circumference your... Difference between front and rear tires must be between 1018 mm ( 40.1 in )... Each time the tyre is the measurement of the need for bias radial... Wheel covers that match your tyres just type in a metric or size! Rear tires must be confirmed by Certified Ag tire Dealer before use size for tires! When searching for tyres that are a different size than stock are the section width of tire! ; UPDATE - ADJUSTED level 3 from Tuesday 29th December 2020 implements require specific tire can! Are a different size than stock tires include the tire Chart ; tractor tire Conversion Chart ; tractor sizes! Same size bias-ply tire can have a JD 750, 20yrs old with turf or patterns.