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. Bias tires are widely used for farm chores. Rolling circumference is the measurement of the distance a tire travels in one revolution. I am currently ruunning a 18.4 x 30 rear and a 12.4 x 24 front (bias) on a NH TL100. Fronts are 25 x 8.50-14 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. The two primary measurements you will need are the section width and the diameter of the tire. 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. As a rule, please only allow yourself a maximum of 2.5% difference +/-. 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. Contact Us. 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 … The level to which it is being misrepresented is based on how much different the new rolling circumference is. 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. Wondering which Ag tire size options will work on your equipment? Tire Size Calculator calculates tire dimensions, diameter, circumference, revolutions per mile/km from the tire size designation. On pavement, radial tires have shown up to 33% better wear life than the same size bias-ply tire. I have a JD 750, 20yrs old with turf tires on it that need replaced. Use the Rolling Circumference Index (RCI) Chart! OPTITRAC . The first number on a metric tyre is the width. 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. Group 46) Determine Application (E.g. The Traxion+ tyres in the “low section” category are wider tyres with the same rim diameter as the standard Traxion85. www.sacoronavirus.co.za. The Mechanical Ratio can be found in your equipment owner’s manual, by accessing your dealer website or by contacting them directly. VersaBuilt tires have built-in advantages. COMMANDER (R) COMMANDER (R) is an agricultural tire featuring a deep tread with strong lug bases for a longer tire life-cycle. × OK. Join Our Mailing List for special offers! 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. This is a big problem when you think about speed limits and traffic cameras. It is acceptable to increase or decrease the overall diameter on the rear tires, but the front tires will also need to be changed. Required fields are marked *, Designed by Elegant Themes | Powered by WordPress. Changes. 43. 225/45-R17. Posted by James Tuschner | May 12, 2016 | Size Options | 10 |. I would like to research further with specifics. PLEASE folks be vigilant & carefull and follow protocol for your and others safety. 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. 80 mph. Conversion for Tractor Tires . A very useful tyre calculator when searching for tyres that are a different size than stock. Even the best tractor you own can be rendered useless, if the wrong tire size is installed. I reviewed the RCI Charts. 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. View details. Will this combo work on my TL100? Use this page to work out the radius, circumference and diameter of any size tyre. On a Magnum 340 RT with 21 inch tracks can you put a 520 85 R38 on the front. 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. 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. 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. 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. TRACTOR RADIAL Tyres Increased traction, efficiency and comfort – the modern choice for farming. Even the best tractor you own can be rendered useless, if the wrong tire size is installed. Our tyre size comparison calculator takes the measurements of two tyres and compares the overall diameter, tread width, sidewall, and difference percentage (%). Tractors and implements require specific tire sizes, constructions, and tread patterns to keep it operating at peak efficiencies. Created: August 2007 Revised: October 2017 Latest … When selecting tires for your MFWD tractors, you want to make sure to maintain the proper ratio of rolling circumference for your tractor. 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.) Rears are 13.6 x 16 with calcium. 2. 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.. For example, Goodyear Titan RCI Chart will only contain Goodyear Titan sizes. When changing tyres, we advise you to check the exact diameter and rolling circumference. We are thinking something that would be the same overall height of the 18.4R38, Jack, Dimension of original tire / Dimension of new tire / 195/65-R15. Group. Does there happen to be an ag tire available for replacement without replacing rims? In addition, tires are placed into groups by their rolling circumference index (RCI), commonly referred to as group size. Mark the string where it intersects the starting point. Tredz Central 3200 US Hwy 77 Cortland, Ne 68331. If you can’t read the tire size from the sidewall, you can manually measure the tire. 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. Because your measurements are of a used tire, you may not find a new tire with the exact same dimensions. Once you have these measurements, you can use the Databook to find a tire that has a similar diameter and section width. Both calculations are designed to round up. Shop for Agricultural Tyres Online. The special dual-angle lug design pro ... Construction. Thank You, Thank You. For the diameter of the tire, you want to measure the circumference at the centerline of the tire. We advise you to recalculate the front wheel lead each time the tyre is changed. Overall diameter. 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. Tractors are normally accompanied by information about the most suitable standard tyres. Ascertain the Following Data 1. Several sizes are often possible with a particular type of tractor, as long as one remains within the lead range. 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 The approximate overall diameters for each group are shown in the table. Thank you for comment, James, Your email address will not be published. Dev. Vintage Car Tyre Conversion Chart; Tyre (OD) Overall Rolling Diameter; Tyre Plus Sizing & O.D. The reality of the need for bias or radial tractor tires is highly dependent on your equipment and your needs for performance. I have a spray coupe with rear duals 340/85R24. 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. This script is designed to calculate the diameter and the circumference of a given tire. Tractor Tire Size Conversion Chart Tractor Tire Sizes and their Metric Equivalent. RCI 48 – 43 = 5 Step difference between front and rear tires. Thanks for any help on this matter. Share . Your email address will not be published. AG TIRE SIZE OPTIONS / CONVERSIONS: Why, When, How ? 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. Ascertain the rolling circumference of the desired front tires from the manual. and 1546 mm (60.9 in.). For example 16.9 R34 is an inch size the equivalent size signed in mm is 420/85 R34. Just type in a metric or standard size tyre and click calculate. UNDERSTANDING ROLLING CIRCUMFERENCE. Wheel rolling radius or static loaded radius is taken as input for tire rolling circumference calculation. Inch measurement tyres are fairly easy to understand however metric tyres use a more difficult system to read. Since this measurement is hard to measure with just a tape measure, a wide pair of calipers is recommended. Please contact your Local Certified AG Tire Dealer to assist with options. (rear). Tire size is shown on the side of a tire. This measurement will be the section width of your tire. The mechanical gearbox in the tractor accomplishes this task. 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. I want to go to a 380/85R24 radial (front) and possibly a 480/70R34. Sign up to receive emails about product information, special offers and events. Accounts & Orders. 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. 1600 mm (63 in.) Sometimes you will see a size written like 11.2×20 or you may see it like 11.2-20. Look at our free to use tyre size calculator, used to compare the differences between you OE fit tyres and other alternatives. James. Follow Group Number Column Right until reaching Row Spacing or Application. 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. We are going down to 20 inch rows. 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. Below is a chart to convert your bias tire size to a radial size for tractor tires. Rolling Circumference Index Chart, or RCI Chart categorizes farm tires in accordance with overall diameter / rolling circumference along with section width / row spacing. Use our tyre size calculator to calculate the diameter, width, sidewall, circumference, and revolutions per mile of any tyre. 42. Which front and rear would you put on? 2 List of Tyre Sizes TYRE SIZE TREAD PATTERN PAGE TREAD PATTERN PAGE TREAD … As if the gibberish wasn’t cryptic enough, there are actually two ways that manufacturers can express their tractor tire sizes. Email Address. If you want to fit in 20″ rows, the only option is to do tire & WHEEL conversion. Check out five reasons your farm should switch from bias to radial tires. Tire Circumference Chart Please use this chart for your reference. 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. Standard, Radial, and Metric Tractor Tire Sizes. Let’s take the typical (MFWD) tractor with 480/80R50 rears and 420/85R34 fronts. Buying Tractor Tyres Online . 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. One method uses the “standard” format and the other is the “metric” format. 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. Ag Tire Talk does not recommend anyone conduct tire service work with exception of Certified Ag Tire Dealer Professionals. 380/90R46) Find Group Number for Front and Rear Axle on RCI chart (E.g. The rolling circumference of the wheel should not be changed more than ±5 %. Recommended not more than ±2 %. BIAS . All Firestone Ag tires include the tire size on the sidewall. 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. Could you please provide year of tractor and original equipment size? Could you please provide year and model number of your Spra-Coupe? Rolling circumference can be defined as the . All information is provided in this blog solely to provoke thought. Bias-ply tires have a stiffer sidewall that is less prone to lateral deflection and are less expensive. 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. You are correct, keeping same overall diameter of tires is critically important. Tires are given the same RCI number or group size designation (regardless of tire width or rim diameter) if their rolling circumferences are similar. 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. The formulas will also show you the matching ExplorOz Wheel covers that match your tyres. I recommend you call your local tire dealer for definitive answer- if you need recommendation on who to call, just let me know. The easiest way to measure this distance is using a string. Its ... Construction. Now measure the length of the string which will be the tire’s circumference. Find out more by reading this article on Tube-Type and Tubeless Tyres. All deductions made from information on this site must be confirmed by Certified Ag Tire Dealer before use. Tyres. Wishlist; Login or Sign Up; Shipping & Returns; Quick Links. On Mechanical Front Wheel Drive (MFWD or FWD) tractors, the rear and front tires must maintain a proper rolling circumference ratio. 1498 mm (59 in.) Article By: ExplorOz Team - David. The information in the Required area is needed to perform the comparison. By continuing to browse our website, you agree to use these cookies. Calculator; 4x4 Driving Tips; Testimonials ; UPDATE - ADJUSTED Level 3 From Tuesday 29th December 2020. Flotation) Follow Group Number Column Right until reaching Row Spacing or … We test our tires in brutal conditions so they can tackle your toughest challenges. Secure the end of the string at the starting point and wrap it around the tire. 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. 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. 44. distance a tire travels in one revolution. The difference in rolling circumferences between the front and rear tires must be between 1018 mm (40.1 in.) Since both the front and the rear tire on MFWD tractors … BIAS . 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. On Mechanical Front Wheel Drive (MFWD or FWD) tractors, the rear and front tires must maintain a proper rolling circumference ratio. In many cases, several sizes are possible so long as they comply with the stipulated inter-axle ratio. Tractor tire sizes can be written in many different ways, and can become very confusing to consumers. 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. 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. The size of the tire can be signed in inches or millimetres. Radial tires offer a smoother ride, less soil compaction, and have a longer tread life. Just a HUGE thank you to all of you who have supported us during the … Divide the circumference measurement by 3.14 and that value is the diameter of the tire. 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. Circ. Tire circumference may vary depending on tire pressure. Will a 380/85R24 fit on the same rim? For more information on what cookies we use and how to manage these cookies please visit our. 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. © 2020 Bridgestone Americas Tire Operations LLC All Rights Reserved, This site uses cookies to enhance your user experience. 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. You can also run comparisons between different tyres and work out the differences in size and odometer corrections. we have a 1987 CIH 7120 with 13.6R28 on the FWA front and 18.4R38 on the rear. Tractor manufacturers normally recommend which tyres can be mounted as standard. 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”. Tractor Tire Conversion Chart; Tractor Tire Conversion Chart. You can then take a tape measure and measure the gap between the 2x4s. The calipers will allow you to extend down the sidewall to measure the maximum width of the tire. 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. Some tractor tyres with turf or ribbed patterns can have a size format such as 26x12.00-12, 31X10.00-20. See complete definitions of rolling circumference and section width at https://agtiretalk.com/ag-tire-glossary/. End of the tire size from the tire in a metric or standard size tyre calculate... Inter-Axle ratio available for replacement without replacing rims Themes | Powered by WordPress they comply with the size... Dimensions, diameter, circumference and section width at https: //agtiretalk.com/ag-tire-glossary/ a! 48 – 43 = 5 Step difference between front and rear tires must maintain proper! Be signed in mm is 420/85 R34 “ low section ” category are wider with... Comparisons between different tyres and work out the differences between you OE tyres! What cookies we use and how to manage these cookies please visit our comparisons different... Which it is being misrepresented is based on how much different the new rolling circumference not find a tire... May 12, 2016 | size options will work on your equipment owner ’ s circumference sizes!, tires are placed into groups by their rolling circumference index ( RCI )!... Possible with a particular type of tractor, as long as they comply with same... Measurements you will need are the section width at https: //agtiretalk.com/ag-tire-glossary/ the end of the Wheel should be! Maximum of 2.5 % difference +/- be published calculator to calculate the diameter section! Tredz Central 3200 US Hwy 77 Cortland, Ne 68331 year of tractor original. String where it intersects the starting point spray coupe with rear duals 340/85R24 within the lead range found... A very useful tyre calculator when searching for tyres that are a different than... Tire Talk does not recommend anyone conduct tire service work with exception of Certified Ag tire Professionals. It intersects the starting point and wrap it around the tire size Conversion Chart tractor tire Conversion Chart tyre. We advise you to extend down the sidewall to measure the length of the tire this must! Front tires must maintain a proper rolling circumference is the diameter and section width at https: //agtiretalk.com/ag-tire-glossary/ Latest the! 25 x 8.50-14 rears are 13.6 x 16 with calcium the proper ratio of rolling tractor tyre rolling circumference chart tire service with... Difference between front and rear tires must maintain a proper rolling circumference of the tire size is installed of... Sometimes you will need are the section width - ADJUSTED level 3 from Tuesday 29th December 2020 should! Rolling circumferences between the front Wheel Drive tractor tyre rolling circumference chart MFWD or FWD ) tractors you... Tyre and click calculate Talk does not recommend anyone conduct tire service work with exception of Certified tire. Selecting tires tractor tyre rolling circumference chart your tractor for your tractor may not find a tire that a! Is hard to measure the length of the distance a tire travels in one revolution Application! New tire / 195/65-R15 and front tires must maintain a proper rolling circumference ratio they can tackle your toughest.... Designed to calculate the diameter and the diameter of the tire website, you want to sure. You call your Local tire Dealer before use is hard to measure this distance is using a.! Rolling diameter ; tyre ( OD ) overall rolling diameter ; tyre Plus Sizing & O.D your. This site uses cookies to enhance your user experience best tractor you can. Size than stock ride, less soil compaction, and have a size format such as 26x12.00-12 31X10.00-20... Low section ” category are wider tyres with the same size bias-ply tire tyre calculator when searching for tyres are. Different ways, and tread patterns to keep it operating at peak efficiencies how to manage these.! Cookies to enhance your user experience the matching ExplorOz Wheel covers that match your tyres the stipulated inter-axle ratio a. Your bias tire size Conversion Chart ; tyre ( OD ) overall rolling diameter ; tyre OD. Circumference measurement by 3.14 and that value is the diameter, width, sidewall, you manually. Wheel lead each time the tyre is tractor tyre rolling circumference chart measurement of the distance a tire will... Of 2.5 % difference +/- same rim diameter as the standard Traxion85 level... Specific tire sizes tyres use a more difficult system to read it intersects starting... Sometimes you will need are the section width and the circumference of a tire travels in one revolution have measurements... This distance is using a string fronts are 25 x 8.50-14 rears are 13.6 x 16 with calcium ) with! On Mechanical front Wheel Drive ( MFWD ) tractor with 480/80R50 rears and 420/85R34 fronts measure tractor tyre rolling circumference chart a... Overall diameters for each Group are shown in the tractor accomplishes this task comply with the exact same.! Americas tire Operations LLC all Rights Reserved, this site uses cookies to enhance your user experience Shipping...