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Each RCI group has a logical, even progression of RC where each RC is 5.4% larger than previous one. The Ford 2120 is a 2WD or 4WD compact utility tractor from the Twenty Compact series. Example: OE allows 1.0 – 3.5% lead. The chart below has popular 5 Step MFWD tractor RCI 48 480/80R50 rears and RCI 43 420/85R34 fronts, showing alternate wider and narrower rear and front sizes highlighted below. There is not a tire combination that is a “one size fits all” situation and often different operations would require different sets of tires for the same equipment. Harm-Hendrik Lange: Customer Solutions Engineer for Continental Commercial Specialty Tires (CST). Performance of a 4WD tractor can be optimized by controlling the power distribu- tion between the front and rear axles. This calculator will get you back to a ratio that's closer to your original. Your email address will not be published. The rolling circumference is the distance in inches that a tire travels in one revolution. But before you make the leap, make sure you really need it, and talk to your tire dealer for advice so you know you’re making a great investment and using it well. If you are running radials you may want to consider changing to an “IF” or “VF” type of tire of the same size. Solve for your Crawl Ratio. Lift the tractor off of the ground and mark both the front and the rear tires. If you look in the Michelin data book, however, not all tires have a published RCI. Your email address will not be published. It would be nice if manufacturers would list the Front-to-Rear Overdriven Ratio in the tractor specifications but alas, most average SCUT & CUT buyers wouldn't know what to do with the information and dealer salesmen would have even less of a clue what it meant or how to explain it to a customer. One of the key tools that is used to adapt or convert tires from crop to crop or grower to grower is the RCI or rolling circumference index. The tractor was taken off road and placed in 4WD. There are several instances where it might make sense to change or convert tire sizes and wheels on tractors. Front: 11.5-20 (6PR), Rear 14.9-28 … If both tires on an axle is changed, there should be no problems. If you measure the circumference of the front tire and then the difference you should be able to calculate the % lead of the front axle. What isn’t it doing or what do you want it to do better? Who really knows until after the fact so consider the most flotation you can justify. They look cool and have the potential of being very functional, but they may also be robbing you of power/gas mileage. Failing to find anything in print for the YM1401D front to rear gear ratio, I decided to take Scotty's advice and just measure it. 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. If converting to these higher technology type of tires does not satisfy ground pressure reduction goals then you may opt for a wheel/tire conversion to tires with a larger air chamber. Precision Inflation, LLC The tire industry has developed the RCI (Rolling Circumference Index) system based on the OD of tires to assist manufacturers in the proper of selection of tire size combinations that will work. RCI 48 – 43 = 5 Step difference between front and rear tires. Or maybe a bit of both. The RCI is the rolling circumference or the distance a tire travels in one revolution. For instance if the front tires are not changed the rear tires OD increases, this will put the tractor into a negative lead/lag meaning the rear tires will be pushing the fronts which could lead to the differential binding up and potentially locking up. For example, operating in low buildings or if a lower center of gravity is required (for use on steep inclines). NOTE: In order to choose proper tire combination, MFWD clutch ratio for your tractor … This interaxle ratio will change depending the tractor model, type of transmission and the front axle configuration. On some surfaces you may find that the front tires are dragging the rears, and on other surfaces that the rears are push-sliding the fronts. It's a good question. For some select large Deere tractors, you can look at the frame for indicator: In the case of a 4-Step Tractor, you simply select a RCI 48 Rear and matching RCI 44 Front. The index is a grouping of tires that are all within about 4 inches of each other in outer diameter (OD). Your equipment should be able to get this information and calculate if the desired tire combination will have an acceptable front lead. For traction and soil compaction (and maybe also for optics), it’s recommended to always choose the highest RCI option the OE permits for the vehicle type, if there are not specific reasons to divert from this theory. It is worth thinking about for … Regardless of which RCI system you use, when you’ve picked out the options, it’s always good to get that second opinion from your equipment dealer or experienced farm tire technician. All information is provided in this blog solely to provoke thought. In order to provide solutions that are flexible to an evolving global market, the equipment manufacturers or OEMs offer their machinery with tires of different diameters or widths for the same machine to adapt their equipment to the specific needs of that grower or crop. You may have a situation where you have the right tires, but need a central tire inflation system (CTIS) to take advantage of them. You don’t need a rim change, there are normally no clearance issues, and you can lower ground pressure by up to 52%. Selecting the right tire/rim combination and using it to its best advantage can be a very powerful way to get the most performance and efficiency from your equipment. Radial tires generally provide better traction, less soil compaction, better comfort, and can be run at lower air pressures. Using the chart, first cross reference your current gear ratio and tire diameter to find your approximate RPM at 65 MPH. Whenever changing the fitment it is best to do the research and understanding what is currently on the tractor and what the RCI drop is from rear to front. 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. Most commonly, a producer or tire dealer will use lead/lag calculations or RCI (rolling circumference index) when converting tires and wheels from duals to wide singles, converting bias to radial, old standard radial tires to newer metric tires, etc. Because of the increased air pressures and load carrying capacities of IF/VF tires, it would be wise to check the standard wheels being used. The advent of powered front axle tractors or mechanical front wheel assist / drive (MFWD) tractors to provide more power (torque) to pull implements in the field requires a clear understanding of the RCI impact. They put a patch in there. Make sure they are built to handle the higher pressures and loads these tires will carry. When selecting a new tire size, a person must choose the same front and rear combination RCI that matches up with the original tires. The various gears in the transmission and differential multiply the torque and split it up between the wheels. These size changes are often required when going from wider to narrower rows, or vice versa. Be careful: “close” may not be close enough, and it will be an expensive lesson. A 4 Wheel Drive tractor should weigh 85-125 pounds per engine horsepower. Alliance Tire Americas We recommend the check to confirm the lead and acceptable technical data for each tire change individually. The torque from the engine is what moves your car. Many tractors have special requirements. You can match a group 49 with a group 44 or group 47 with a group 42 and they will work fine on the tractor. The Kubota L2500 is equipped with a 1.4 L three-cylinder diesel engine and sliding gear transmission with 8 forward and 2 reverse gears. 4) Load and inflation pressure – the RC specified for each tire size and model in the Tire Manufacturer Databook is measured when the tire is set at nominal inflation pressure and under nominal load. If you are working with the Rolling Circumference Index group system, most MFWD tractors need to have fronts and rears that are 5 steps apart in the RCI, like a 50 Group in the rear and a 45 Group for the fronts. OEM engineers physically test each tire combination using the correct inflation pressure for the load before they release these tire combinations and offer them for sale. The problem is that none of these conditions hold true on a our tractors, so we have to use a different methods. Some conversions are done to increase traction, reducing slip and thereby saving on fuel. Going to a smaller diameter front and rear will work as well by selecting any tire from RCI 47 rear – 42 = 5 Steps. If you have a “negative” slip result, the front tires will experience a braking effect that creates a loss of pulling power, more fuel consumption and reduced steering capability.”, PRECISION INFLATION, “It is important to remember that RCI is a great guide; however, sometimes a tire will have a rolling circumference between groups or have variation between manufacturers- that is why we recommend contacting your local tire dealer to ensure lead lag is correct based on ACTUAL Rolling Circumference.”, BKT, “Because of the increased air pressures and load carrying capacities of IF/VF tires, it would be wise to check the standard wheels being used. Ken Brodbeck, VP of Technology. This balance is the tractor gear ratio also known as, “the lead or lag ratio”. For the front tires to pull successfully and produce the right amount of pulling power with the right “slip” to stay within the tractor gear ratio, the proper tire slip needs to be between 1% to 5% = “positive slip”. It can be worth every penny you invest, and then some. You get it de-mounted. But, before you jump to expensive or complicated solutions, first determine if moving from a bias to radial, or from a standard radial to VF, or finding a tire with a larger overall diameter that can be mounted on the same rim can get you to the target goal. Also be sure you understand the air pressure requirements at different operating loads and speeds and determine if you are going to be able or willing to make changes on air in the field. Nick Phillippi: National Product Manager. Articulated 4WD … Continental Agriculture North America This is the method I used. However, with front wheel drive tractors (MFWD) the relationship between the front and the rear axle, called interaxle ratio, must be maintained in order to have the best traction performance and to avoid transmission issues. This tractor was manufactured by the Kubota from 1998 to 2000. To continue our example of the 500 hp 4WD tractor at 60,000 pounds, this tractor should weigh around 33,000 pounds on the front axle and 27,000 pounds on the rear axle. I need to keep my front/rear tire rolling circumference the same ratio to maintain the positive slippage on the 4wd tractor. For a tire size to be considered within a specific RCI, the calculated RCI of the tire must be between -0.2 to +0.2 of the RCI for that group. If you’re looking for more footprint and thinking about a larger tire, you need to be sure you won’t have too much tire— if your tires are too big, you won’t be able to gain what you want as insufficient weight will not provide full footprint at low inflation pressures. If the same sizes are used on front and rear, there are no issues. Front: 9.5-20 (6PR), Rear 13.6-28 (6PR) U60. Maxam Tire International Factors that could lead to smaller tire diameters: – If the total height of the vehicle needs to be limited. The front tires must always turn faster than the rear tires as they are smaller and need more revolutions to cover the same distance. The first selected/entered tire size in the Tire Size Calculator is the base tire for a comparision to the other tires. The idea is as long as the rear and front RCI’s are 5 steps apart they will work on the tractor. The Kubota L2500 is a 2WD (L2500F) or 4WD (L2500DT) compact utility tractor from the L series. Alliance Tire Americas, James Crouch, National Product Manager — Agriculture. One of my favorite up-fitment examples for a very popular tractor setup is switching out 480/80R50 and 380/80R38 sets to VF480/95R50 and VF380/95R38 sets. The Rolling Circumference Index (RCI) is a grouping of tires based on the rolling circumferences. Select tires with suitable load-bearing capability. You might need to replace worn tires that don’t have enough lug depth left to give you the traction required or you may need to change your tire set-up. As if the gibberish wasn’t cryptic enough, there are actually two ways that manufacturers can express their tractor tire sizes. Let’s take the typical (MFWD) tractor with 480/80R50 rears and 420/85R34 fronts. It takes a certain amount of weight for a tractor to transfer one horsepower of energy from the engine to the ground — figure 130-140 pounds per PTO horsepower for front-wheel assist (MFWD) tractors and 95-110 pounds per PTO horsepower for 4WD tractors. 4. These conversions can be via larger diameter, wider section width tires or both but will typically need rim changes also. U70. The front tire mark should be slightly past one revolution. Is your machine ballasted properly? 2. This Index is created using the tire’s Rolling Circumference (RC). Search × Search × Main Menu; Company . Front tires typically are spinning 1%-5% faster than the rears. This ratio will vary based on the downforce the implement exerts on the tractor’s rear axle. Even if the MFWD is switched off on road normally, many tractors engage MFWD while braking, so high lead values may create high tension in the drive line. The Front to Rear Gear Ratio Tire Slippage Calculation is as follows: (Front Tire RC x Tractor OEM Model Gear Ratio) / Rear Tire RC) – 1) 100 = Slip %. Most North American MFWD tractors have a gear ratio of approximately 1.332. 3. Fortunately for farmers, all the other known causes of power hop can be addressed through adjustments to overall tractor weight, weight distribution and tire inflation pressures. This will maintain the correct RC ratios to insure proper front axle lead. A typical case is with sprayers, where during crop applications “skinny” tires are used to reduce crop damage and large flotation tires are used for broadband application without a crop standing. At Alliance Tire, we prefer to provide the actual number of inches in the rolling circumference so you can be extremely accurate about your choices. These differences could allow, depending on the tire brand and their tolerances, the same tire size from one brand to be included in one RCI group and another brand tire to be included in a different RCI group. Greg W. Gilland: Business Development & Ag Segment Manager. This lead is specific and may vary depending on the manufacturer and the vehicle. Of course, more tire width and more section height normally mean more air volume = load capacity at the same inflation pressure. Converting tire sizes to reduce compaction can help by reducing ground pressure from your equipment. That's the right concept....and the method that you are describing works for a 4wd car or truck or for anything where the front and rear tires are identical, inflated the same, and assuming that the loading of the front axle is the same as the rear. For a field work tractor, I would use the 3.4% option, for a tractor used often in road transport, I would choose the 1.1% lead option. I'd like to install a little bigger tire since, from what I can see, the 8-16 tire size isn't very popular anymore. In order to be able to consider all tires (including the ones out of the RCI spread) and to assure we have correct front axle lead; we need to use the actual Rolling Circumference (RC) of both tires and the interaxle ratio for that specific tractor model for our calculations. Tire manufacturers should provide their tires’ rolling circumference (RC) or the RC Index (RCI) values in their published product data to allow growers to calculate the right size tire fitment from front to rear for their equipment to ensure the right amount of positive slippage or pulling power for the given gear ratio. It is acceptable to increase or decrease the overall diameter on the rear tires, but the front tires will also need to be changed. If you need assistance with this, all Michelin Ag reps are equipped with the tools and knowledge to walk you through this. 1-888-513-8473 Login or Sign Up; 0. The main issue to consider is what are your goals? What the RCI difference is between the front and rear axle, as this should be kept constant. There are many occasions when an end user is looking to change the tire set up on their tractors, such as going from narrower row crop section widths to more of a floatation configuration. 2) Tread pattern – A R-1 tire’s RC is smaller than its R-1W counterpart of the same size and the same brand. Then reference your new tire diameter with your choice of RPM to find the new gear ratio needed to supply you with that RPM. On the other hand, in the case of utility and compact tractors moving away from an Ag bar design to and industrial lug design, both of these are fairly common. On the other hand, if a tractor operates part time or is on road often, lower lead values may be considered. Well, the patch doesn’t work either, not by itself. Basically, your tractor is designed around a very specific ratio between the RCIs of your front and rear tires, so to avoid excess tire wear or even destroying your transmission or transfer case, you must change the front and rears in the same percentage. Typically, a farmer wants to produce the highest yield with the best quality at the least cost of production. It is necessary to be very careful when changing sizes on these tractors. Ag Tire Talk does not recommend anyone conduct tire service work with exception of Certified Ag Tire Dealer Professionals. Enter the values on the left and press Compute. Wheels will have to be changed because of the sizes and widths of the tires used. There are options available to decrease your ground pressures and the best option for your operation should be investigated. By knowing what the front to rear gear ratio is on a tractor, a person can use the RCI (Rolling Circumference Index) data to stay within the required range for the tractor. In addition to this “faster” front tire rotation (depending on the interaxle ratio), the front tires rotational speed needs to be 1 to 4% higher than the rears to assure the grip and to help with steering. As a rule, the “ideal” tractor gear ratio between the front axle and the rear axle (IAR or Inter-Axle Ration) ranges from 1.2 to 1.5. So how do we find the new set of tires and keep the proper front/rear tire gear ratio required by the tractor manufacturer? An example is the 480/80R50 rear and 380/80R38 combination on MFWD. You need to compare the likely savings to the cost and really see if the payback will be worth the payment. On MFWD tractors, if the fronts are too big and/or the rears are too small, the fronts will pull the rears (lead). Tractor Ford / 1920. The Kubota L2500 compact utility tractor used the Kubota D1403 diesel engine. If you can’t harvest your crops due to wet soils you probably need to convert your combines to a flotation setup. If you have too much positive slip ratio (above 5%) you will have “excessive” work by the front tires pulling the rear tires equates to a loss of efficiency and higher fuel consumption. Most tire/wheel conversions are done to gain footprint or increase tire volume (actually, they’re both the same thing), lowering air pressure and thereby reducing compaction. In the instance where RCI is not available, you may need to calculate the mechanical lead. If the front tires cover less distance than the rear tires, they would create a braking effect with potential transmission damage. 3) RCI spread – Not all tire sizes can be assigned to specific RCI group (remember the -0.2 to +0.2 spread of RCI) and some will fall outside this spread. Changing tire sizes on 2-wheel drive tractors is straightforward. If your tires are bigger than stock you probably, like myself, have spend a lot of time trying to WAG (wild ass guess) your actual MPH when going down the road. Traction: If you have trouble pulling implements in high torque applications, grain carts or any other application with a reasonable amount of slip you may need to increase your traction. The transmission must be geared so that both fronts and rears turn at basically the same speed, since the fronts will turn more revolutions. Overall tractor weight . Important: whenever you change sizes on MFWD units, you must maintain the correct lead/lag by keeping in mind the RCI—the Rolling Circumference Index, which factors in the length on the ground of one full rotation and the height of the tire (don’t worry, it’s on a chart from your tire manufacturer). Titan offers an online lead/lag calculator to assist in the selection of tires. Modern Agriculture requires different kinds of tires (size, tread pattern, technology) for different applications and conditions in order to increase productivity, reduce compaction, increase flotation, reduce equipment damage and increase operator’s comfort. Torque is the twisting force that the engine produces. This balance is the tractor gear ratio also known as, “the lead or lag ratio”. Dynamic measurement of the gear ratio 1. This is a great tool to use when selecting different options for your tractors. Posted by James Tuschner | Mar 2, 2020 | Size Options, Uncategorized | 0 |, TRELLEBORG, “There is not a tire combination that is a “one size fits all” situation and often different operations would require different sets of tires for the same equipment.”, TITAN, “The tire industry has developed the RCI (Rolling Circumference Index) system based on the OD (Overall Diameter) of tires to assist manufacturers in the proper of selection of tire size combinations that will work.”, CONTINENTAL, “The Rolling Circumference Index (RCI) is a grouping of tires based on the rolling circumferences. You have an option to compare two additional tire sizes to the base tire. Norberto Herbener: OE Applications Engineer. Even the data from the same tire manufacturer may vary for the same tire size, if multiple tire lines exist or if there are tires with different load indexes within the same tire line. Model. https://www.titan-intl.com/en/resources/Lead-Lag-Calculator. If you know your gear ratio and tire size you can get a fairly close idea here. In other words, the front tires will turn more times as the tractors moves forward for every rear tire full revolution. Required fields are marked *, Designed by Elegant Themes | Powered by WordPress. By Joel L Nicoll in forum New Holland Owning/Operating, Family and Friends (Announcements & Notices), Changing tire size on a four wheel drive tractor, Trying to understand tire size and ratios, Tire pressure and front wheel drive lever for YM1601D. Titan International, Inc. (Manufacturer of Titan and Goodyear Farm Tires) – If the turning diameter needs to be optimized. The smaller front tires must travel faster to stay in the same ratio or time that the larger rear tires travel as they roll. Rolling Circumference Index (RCI) is commonly used to match front and rear tires to each other within a given gear ratio. In this situation, a person may have to change wheels and tires when converting to radial tires. In this instance, yes; the proposed Michelin Agribib 2 tires will fit within the manufacturer’s specifications. Equipment like sprayers (same size tires all around the equipment) or equipment with hydrostatic drive (like combines) are not affected by mandatory equivalent rolling circumference when changing tire sizes. The current size is 8-16 Firestones. The following ratios are possible: 1.347; 1.392; Determine Tire Rolling Circumferences: This information must be obtained from the tire manufacturer's manual. This chart is based on a drive gear of 1:1 at 65 MPH using a manual transmission. If your tractor manufacturer alternatively allows you to increase to RCI 47 tires on the rear axle, the front axle should then also increase to 42 to keep the difference of 5 RCIs constant. All deductions made from information on this site must be confirmed by Certified Ag Tire Dealer before use. It’s suggested not to mix tread patterns. If the tractor is mainly used for field work, lead percentage may be chosen on the upper tolerance of the permitted tolerance band, as little higher lead values allow sharper field end turning with engaged MFWD compared to lower lead values. If you run bias tires by chance you can make drastic improvements by switching to the same size in a radial tire. But what about 20” rows or bedded vegetable crops? We now take the rear tire size rolling circumference and divide it by the tractor gear ratio. What is important when selecting different tire sizes is that the difference between the rear tire RCI and the front tire RCI is the same as the tires being replaced. Same way with the fronts: we moved from rolling circumference of 183.3 inches to 195.2 inches—or the same 6%, to maintain the same front-to rear-ratio. Be careful—even standard R-1 tires of a particular size from two different manufacturers—or different designs from the same manufacturer—may vary slightly on RCI, so double check them all. There are several situations when a farmer should consider converting his current wheel/tire setup to an alternative configuration. It is important to remember that RCI is a great guide; however, sometimes a tire will have a rolling circumference between groups or have variation between manufacturers- that is why we recommend contacting your local tire dealer to ensure lead lag is correct based on ACTUAL Rolling Circumference. Keep in mind that when changing tire sizes on front wheel assist tractors you need to maintain your lead/lag ratios to enable the tractor to operate mechanically within the design parameters. MFWD tractors are 4-wheel drive vehicles with different sizes of tires on the front and the rear. Always contact the tractor manufacturer to be sure. 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