We help you decode your existing tyre size if you're having difficulty working out the size you need - especially if you have an old tyre that doesn't follow the new sizing conventions for crossply or radial tyres. For each tyre size you input our tyre calculator suggests multiple tyre sizes that are with in one inch bigger and smaller of the entered tyre size. MICHELIN tires, products and services L. What's New. Use rolling circumference information from your tire dealer to calculate front wheel lead. Then as a bonus it shows examples of your speedometer reading with the first tyre, and the actual speed you"re traveling if you were to install the second tyre. In MFWD tractors, both the front and rear tires do the work. Minilite; Revolution Alloy Wheels; Alloy Wheels for Ferrari; Alloys For Vans. Rolling circumference is the measurement of the 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. Too much positive slippage, or leading, can cause the front tires to do too much work and become less efficient. The sidewall height is a percentage of the width of the tyre. Calculator. Spare Wheels; Alloy Wheels; Classic Cars. Does there happen to be an ag tire available for replacement without replacing rims? Tyre Size Calculator - click here or call 01244 459 611 for more information. This document specifies the method for measuring rolling circumference for new tyres, under loaded conditions, made for use on agricultural tractors and machines, and applies to agricultural tractor drive wheel tyres in diagonal and radial construction. Thomas5060 Member. 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. You can also run comparisons between different tyres and work out the differences in size and odometer corrections. Use our tyre size calculator to calculate the diameter, width, sidewall, circumference, and revolutions per mile of any tyre. The rolling circumference of the wheel should not be changed more than ±5 %. It also solves the problem of deciding what tyre you would like to run if you have inch measurements in mind but can't find a company that manufactures that inch size tyre. Our tyre calculator makes this happen for you. The sidewall and aspect ratio are used in metric sized tyres to determine the overall height of a tyre. A very useful tyre calculator when searching for tyres that are a different size than stock. Also browse our tyre categories and deals pages for Jeep tyres, 4X4 tyres, cheap new tyres, all weather tyres, cheap truck tyres, all season tyres, and tyres with free shipping. Menu Home; Tyres by size; Tyre Size Decoder; Contact Us; Blog; Sign In; Home; Tyres by size; Tyre Size Decoder; Contact Us; Blog; Sign In; £0.00 Checkout Search Go. Jan 9, 2017 #3 Beefman75 said: Might be a bit of a daft question, but if a 4WD tractor has 34" rear wheels, can you just swap them for 38" or do you need to change the front wheels as well? 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. Rolling circumference can be defined as the . Skip to primary content. BIAS . The mechanical gearbox in the tractor accomplishes this task. A tyre size conversion calculator or tyre diameter calculator are the best ways to get the answers you are looking for. 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. In this table you will find also your equivalent size for low section tyres like 480/70R34 650/65R38 650 = Width of the tyre in mm (side-wall to side-wall, not the pattern-size!) 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. In MFWD tractors, both the front and rear tires do the work. × Wheelcalc.com. Tire … The first number on a metric tyre is the width. Tyre Size Calculator Use this page to work out the radius, circumference and diameter of any size tyre. Shop for Agricultural Tyres Online. Divide this by 25.4 to get inch equivalent. Tire size is shown on the side of a tire. Inch measurement tyres are fairly easy to understand however metric tyres use a more difficult system to read. Location Larne, Northern Ireland. Calculate metric or inch tyre dimensions and compare to similar tyre sizes. © Titan International, Inc. document.write(new Date().getFullYear()). Just type in the metric fields and click convert to inches. 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. Titan International, the leader of both Titan and Goodyear Farm Tire brands, offers a full line of wheels, tires and undercarriage products for a wide variety of off-the-road equipment. Just type in a metric or standard size tyre and click calculate. Below is a chart to convert your bias tire size to a radial size for tractor tires. The target rolling circumference for each group is shown below. 205/45 R17 / R . When selecting tires for your MFWD tractors, you want to make sure to maintain the proper ratio of rolling circumference for your tractor. 215/45 R17 / R . Too much positive slippage, or leading, can cause the front tires to do too much work and become less efficient. 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. We advise you to recalculate the front wheel lead each time the tyre is changed. One method uses the “standard” format and the other is the “metric” format. When going to a larger tyre size or dropping down to a lower tyre size on a set of alloy wheels it is important to make sure your vehicles rolling circumference remains the same or as close to the original rolling circumference as is possible. Skip to secondary content. To use four-wheel drive effectively, the inter-axle ratio must amount to between +1% and +5% (rolling circumference front tyres > rolling circumference rear tyres). Use the comparison tab to see side by side comparison and speedometer error. The information in the Required area is needed to perform the comparison. Just type in a metric or standard size tyre and click calculate. Tire Circumference Chart Please use this chart for your reference. Thank You. Making it as simple as possible to find the tyre that is just right for you. This second number is that percent. View details. Please enter the width, aspect ratio and rim size for your current tyre and proposed new tyre. Understanding tire group size is important for proper tractor setup when equipped with an MFWD or Independent-Link Suspension (ILS™). Reply. Too much negative slippage, or lagging, can have a braking effect on the front tires and reduce your steering ability. There are many more possibilities and choices in metric tyres so the use of a tyre size calculator can come in handy. Sometimes you will see a size written like 11.2×20 or you may see it like 11.2-20. Tyre Plus Sizing & O.D. Welcome on the Michelin Agricultural tyres website: tractor tyres, harvesters tyres, sprayer tyres, trailer and trailer tank tyres, combine tyres, backhoe loader tyres, loader tyres, telehandler tyres, skid steer tyres, wheel excavator tyres . NOTE: Table shows target rolling circumference and should NOT be used to calculate front wheel lead. On Mechanical Front Wheel Drive (MFWD or FWD) tractors, the rear and front tires must maintain a proper rolling circumference ratio. Since the front tires are smaller than the rear tires, the front tires have to rotate faster to cover the same distance as the rear. Our tyre size comparison calculator takes the measurements of two tyres and compares the overall diameter, tread width, sidewall, and difference percentage (%). Ray Bauder on April 20, 2020 at 7:47 pm I have a JD 750, 20yrs old with turf tires on it that need replaced. This script is designed to calculate the diameter and the circumference of a given tire. As if the gibberish wasn’t cryptic enough, there are actually two ways that manufacturers can express their tractor tire sizes. Use the tyre calculator to populate a list of alternate tyre sizes. Tire calculator let you find correct tire to your car. Rear tire groups 44, 45, and 46 are available for 7330 tractors. Rolling Circumference Index Chart, ... Could you please provide year of tractor and original equipment size? Tyres. A very useful tyre calculator when searching for tyres that are a different size then stock. With a network of dealers all over the world, Titan is a global brand that original equipment manufacturers and operators can count on for durable products and quality service. Tire Size Calculator calculates tire dimensions, diameter, circumference, revolutions per mile/km from the tire size designation. EN Select country Search. Use the table below to help you find radial tire size equivalents and metric conversions. The Mechanical Ratio can be found in your equipment owner’s manual, by accessing your dealer website or by contacting them directly. The third number generally preceded by an "R" is the wheel diameter. MICHELIN tires, products and services . UNDERSTANDING ROLLING CIRCUMFERENCE. Tire circumference may vary depending on tire pressure. What sets us apart is our tyre suggestion guide. 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 tire size comparison calculator takes the measurements of two tyres and compares the diameter, width, sidewall, circumference, and revolutions per mile. With the growing number of mechanical front wheel drive (MFWD) tractors, the rolling circumference of the tires play an important role in determining the correct setup for your tractor. As a rule, please only allow yourself a maximum of 2.5% difference +/-. Exact rolling circumference values vary for each tire size. 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 Example: 285/75R16 (285 X 75 / 2540 x 2) + 16 = 32.8 inches tall. It also includes an explanation of the rolling circumference index (RCI) and speed radius index (SRI). Current Tyre Size Proposed new tyre size; Enter a radial size: E.g. Both calculations are designed to round up. Find the right rim for your car. 65 = Height percentage of width (650mm x 0.65= 422.5mm) OPTITRAC . The first number on a metric tyre is the width. 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”. 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. Ads Ads Compare tire sizes Here you can compare different tire sizes against your original dimension and show alternative tire sizes. As a rule, please only allow yourself a maximum of 2.5% difference +/-. Fronts aswell ,you chew the drives out if you dont ,bigger rear wheels will give you a larger rolling circumference . Its ... Construction. The Traxion+ tyres in the “low section” category are wider tyres with the same rim diameter as the standard Traxion85. 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