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