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. If you are looking for narrower options, simply move to the left of the RCI 48 480/80R50 for rear tire options, then move to the left of RCI 43 420/85R34 for front tire options. 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. For example, a certain John Deere machine may have a “5 step” transmission. CEAT Specialty Tires Inc. This will maintain the correct RC ratios to insure proper front axle lead. We now take the rear tire size rolling circumference and divide it by the tractor gear ratio. 3. The current size is 8-16 Firestones. The RCI is the rolling circumference or the distance a tire travels in one revolution. 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. What do a lot of people do? Your equipment should be able to get this information and calculate if the desired tire combination will have an acceptable front lead. For four-wheel drive tractors, dual tires increased the pull/weight ratio at a given slip level when compared to singles. 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. That is called a 5 step drop. 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. There are several instances where it might make sense to change or convert tire sizes and wheels on tractors. A general recommendation is a 60-40% split, with 60% of the weight in the front. Precision Inflation, LLC For the front tires … This ratio is referred to as the gear ratio and, depending on the brand and type of tractor, is normally between 1.20 and 1.50. The tire circumference difference can theoretically be calculated by the RCIs or the RCI difference: For example, if the transmission ratio is 1.27 and the tire circumference ratio is 1.30, this would mean 2.36% lead for all tire combinations with 5 RCIs difference (1.30/1.27 = 1.0236) on this machine. If you are running radials you may want to consider changing to an “IF” or “VF” type of tire of the same size. It can be worth every penny you invest, and then some. Freight Shipping; About Us; Contact Us; Find Us; Your Next Tire Blog; Staff; Staff2; Español; Return Policy; MSDS Sheets; Tax Exempt Form; Reviews; Equipment Info . If your tires are mismatched with respect to the mechanical lead ratio of your machine, you would experience increased fuel consumption, erratic or rapid front/rear tire wear, wear and tear on your transmission, and overall poor tractor performance. If you know your gear ratio and tire size you can get a fairly close idea here. David Graden: Operational Market Manager – Agriculture. They put a patch in there. This additional rotational speed is called front axle lead. The next higher RCI is always ~5.4% higher (+/- .2 % Tolerance), which means a factor of ~1.054.”, ALLIANCE, “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.”, MAXAM, “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. The gear ratio on the typical MFWD ranges from 1.2 to 1.5; therefore, the proper setup should allow . MFWD tractors are 4-wheel drive vehicles with different sizes of tires on the front and the rear. 1-888-513-8473 Login or Sign Up; 0. Then determine if you’re doing all you can with what you have. 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. This interaxle ratio will change depending the tractor model, type of transmission and the front axle configuration. $45. In this instance, yes; the proposed Michelin Agribib 2 tires will fit within the manufacturer’s specifications. 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. Growing the footprint in length will increase traction. RCI difference = 5 = 1.054 x 1.054 x1.054 x 1.054 x1.054 = 1.054 ^5 = 1.30, Old tires RCI 41 & RCI 46: (4275mm & 5550mm) = 5550 / 4275 = 1.30, New tires RCI 42 & RCI 47: (4505mm & 5850mm) = 5850 / 4505 = 1.30, Allow the Chosen Equipment to fulfill its purpose. Tire/wheel conversions for traction reasons is not very common since these conversions would likely be to a narrower tire that will increase traction but also increases ground pressure along with compaction potential. Ken Brodbeck, VP of Technology. Scott Sloan: Ag Product Manager / Global LSW. It’s suggested not to mix tread patterns. 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. Or maybe a bit of both. Flotation: Flotation problems are encountered at times and harvest time is certainly a critical time. Tyre size. 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. An action plan to correct the compaction problem needs to be developed and implemented. The permitted front wheel lead value is between 0% and +6%. 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. 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. The footprints are enlarged due to the sidewall deflection which will grow the footprints in length. If the fronts are too small, the rears will push the fronts (lag). Lastly, seek out all the options to really determine which makes most sense. Most tractor manufacturers impose a mechanical lead of between 0% and 6%. The next higher RCI is always ~5.4% higher (+/- .2 % Tolerance), which means a factor of ~1.054. Multiply this number by the rolling circumference "RC" (get from published tire data) of the front tire size. 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. 4. Make sure they are built to handle the higher pressures and loads these tires will carry.”, Trelleborg Wheel Systems 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. Also, are you making the decision based on an unusual season, a unique event ,or small part of your overall operation? But what about 20” rows or bedded vegetable crops? In the above example, we took off rears that had a rolling circumference of 240.7 inches and replaced them with tires with rolling circumferences of 256.6 inches, a difference of 6%. Ag Tire Talk does not recommend anyone conduct tire service work with exception of Certified Ag Tire Dealer Professionals. 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. The maximum RCI that is permitted (including the front tires for pairing). This is the value referred to by some OEMs when they mention that the ratio between the front and rear axles is 5 steps. There are charts available that show the different sizes and their perspective RCI values. If narrower or wider tires are wanted or needed on MFWD’s (Mechanical Front Wheel Drive), in order to stay within the correct lead/lag ratio it will probably require changing out tires and wheels. Remember, tires are considered part of the tractor transmission. 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. Rolling Circumference Index (RCI) is commonly used to match front and rear tires to each other within a given gear ratio. It is worth thinking about for … Below is the MAXAM example of tires having similar diameters but different widths within the same RC or RCI to determine what is the best tire size suited to meet their field or crop production needs. Harm-Hendrik Lange: Customer Solutions Engineer for Continental Commercial Specialty Tires (CST). This is a great tool to use when selecting different options for your tractors. In 4wd turn the rear tires one full revolution. By entering the published rolling circumference of the front, rear or both and the gear ratio of the tractor it will tell you the target rolling circumferences of the tires that are needed to make the combination work. What isn’t it doing or what do you want it to do better? For getting the first pass options narrowed down, nothing beats the RCI Chart! The rolling circumference is the distance in inches that a tire travels in one revolution. 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. Combine conversions to a flotation setup is usually a drastic change to maximum flotation. Radial tires generally provide better traction, less soil compaction, better comfort, and can be run at lower air pressures. The rims may have to changed depending on the size and the width of the tires used. 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. BKT’s line of VF tires (V-Flecto) are designed as a Narrow Rim Option (NRO) and will work on the narrower standard rims. This gives us 163.79. A plumb pencil line was marked through the center of the left front and rear rims. If there is no limitation from that perspective (like row applications or plowing in a furrow), maximum permitted values are recommended for maximum performance on the field. Is there another way that might be less costly for those small windows of need, like leasing another unit for short periods? 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. See the following calculation: It is very important you keep this in mind when are converting one size of tire to another, or in some cases, even between tire manufacturers. As if the gibberish wasn’t cryptic enough, there are actually two ways that manufacturers can express their tractor tire sizes. If you put a plug through the outside it seals the outside, but doesn’t necessarily seal the inside. You get it de-mounted. 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. So how do we find the new set of tires and keep the proper front/rear tire gear ratio required by the tractor manufacturer? Static weight distribution, power-to-weight ratio, tractor dimensions, provision for dual tires, etc., vary from manufacturer to manufacturer as reflected in Nebraska Tractor Test results. The ratio between the number of revolutions in the front and rear axle is very important in a mechanical four-wheel drive (this is determined by gears in the gearbox). The tractor was taken off road and placed in 4WD. Well, the patch doesn’t work either, not by itself. Front: 9.5-20 (6PR), Rear 13.6-28 (6PR) U60. Make sure they are built to handle the higher pressures and loads these tires will carry. The Ford 2120 is equipped with a 2.3 L four-cylinder diesel engine and one of two transmissions: gear type transmission with 12 forward and 4 reverse gears or power shuttle transmission with 12 forward and 12 reverse gears. Typically, a farmer wants to produce the highest yield with the best quality at the least cost of production. Alliance Tire Americas, James Crouch, National Product Manager — Agriculture. On the other hand, if a tractor operates part time or is on road often, lower lead values may be considered. They look cool and have the potential of being very functional, but they may also be robbing you of power/gas mileage. The Ford 2120 is a 2WD or 4WD compact utility tractor from the Twenty Compact series. Nevertheless, as the real exact rolling circumference values can vary from the theoretical RCI numbers, the most precise calculation is reached by using the real rolling circumference data from the tire’s datasheet instead of the RCIs. The Kubota L2500 compact utility tractor used the Kubota D1403 diesel engine. For instance, are you operating at the optimal inflation pressure? Some conversions are done to increase traction, reducing slip and thereby saving on fuel. Although most tire manufacturers list rolling circumference for "larger" tires, few smaller rear turfs, and no smaller sized front turfs have a rolling circumference listed in any literature I have seen, (Firestone farm tire data book). In a Deere service recommendation sheet for tire loading, they suggest a preferred 40% volume fill for liquid ballast, but the long-standing tradition of tire loading is 75% fill , which is the maximum John Deere suggests. Jim Enyart: Technical Manager. Switching from bias tires to radial tires would be a smart move in the right circumstances. 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. Front: 11.5-20 (6PR), Rear 14.9-28 … 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. for front tire over-speed up to 5% (consult with the tractor manufacturer for the preferred lead percentage). For example, if the formula result for a specific tire size and brand is 47.5, it would not have an RCI (for RCI 47 you would include the range from 46.8 to 47.2 and for RCI 48 it includes from 47.8 to 48.2). In other words, the front tires will turn more times as the tractors moves forward for every rear tire full revolution. Will the Michelin 420/90R30 and 480/80R46 Agribib 2 give an acceptable lead? This is the method I used. This calculator will get you back to a ratio that's closer to your original. 2. All information is provided in this blog solely to provoke thought. When selecting a new size or type of tire for your MFWD tractor, you must choose a front This balance is the tractor gear ratio also known as, “the lead or lag ratio”. The index is a grouping of tires that are all within about 4 inches of each other in outer diameter (OD). It's a good question. I need to keep my front/rear tire rolling circumference the same ratio to maintain the positive slippage on the 4wd tractor. This balance is the tractor gear ratio also known as, “the lead or lag ratio”. When it comes to a tire/wheel conversion, step one is to determine the goal or the need of the equipment. 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. Does anyone know of any restrictions on size, i.e., circumference? 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.) This is where you have to be careful. Overall tractor weight . If you are looking for wider options, simply move to the right of the RCI 48 480/80R50 for rear tire options, then move to the right of RCI 43 420/85R34 for front tire options. 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. What the RCI difference is between the front and rear axle, as this should be kept constant. 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. Conversions are expensive and they need to be done correctly to get the most benefit you can get. Alliance Tire Americas Your email address will not be published. Solve for your Crawl Ratio. 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. 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. Who really knows until after the fact so consider the most flotation you can justify. 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). Replacing front tires on 4WD 1920 I need to replace the front farm tread tires on my 1995 Ford 1920 that I purchased new. This lead is specific and may vary depending on the manufacturer and the vehicle. One tire combination would end up in 1.1% lead and the alternative one on 3.4%. Required fields are marked *, Designed by Elegant Themes | Powered by WordPress. So, the tire always has to be de-mounted from the rim for a proper repair. Each RCI group has a logical, even progression of RC where each RC is 5.4% larger than previous one. Inflate Your Tires to the Correct Tire Air Pressure Overinflation Crushes Traction Performance. Search × Search × Main Menu; Company . 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. 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. A plumb pencil line was marked through the center of the left front and rear rims. You can decrease ground pressure by increasing the air chamber which can allow for higher load carrying capacities. Factors that could lead to smaller tire diameters: – If the total height of the vehicle needs to be limited. Articulated 4WD … 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. In this situation, a person may have to change wheels and tires when converting to radial tires. 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. Select tires appropriate to the tractor's top speed. 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. That's an interesting analysis of the relationship between the front and rear wheels. Either I didn't explain myself correctly or you didn't read what I wrote. The idea is as long as the rear and front RCI’s are 5 steps apart they will work on the tractor. If you run bias tires by chance you can make drastic improvements by switching to the same size in a radial tire. From the manual, obtain the rolling circumference of the tire desired for the rear wheel. What does this example mean to the lead value? $24,500. 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. This is the reason why specific tire combinations are offered by OEM in some tire brands and not in others. The smaller front tires must travel faster to stay in the same ratio or time that the larger rear tires travel as they roll. When changing sizes on MFWD’s, the +1-5% tolerance to the lead/lag ratio must be honored to alleviate any transmission/transaxle problems. Torque is the twisting force that the engine produces. You need to keep the change the same or at least within 2%. 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. An example is the 480/80R50 rear and 380/80R38 combination on MFWD. 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. If you can’t harvest your crops due to wet soils you probably need to convert your combines to a flotation setup. The first thing to consider is the vehicle’s/tractor’s operators manual and what is written about tires and tire exchange. Using the above equation and the RCI data, as well as the OEM tractor gear ratio, any grower can quickly determine if their equipment will allow switching or evolving to larger tires without compromising their required gear ratio slip rate percentage. We recommend the check to confirm the lead and acceptable technical data for each tire change individually. https://www.titan-intl.com/en/resources/Lead-Lag-Calculator. You need to compare the likely savings to the cost and really see if the payback will be worth the payment. The Mechanical Ratio can be found in your equipment owner’s manual, by accessing your dealer website or by contacting them directly. 100 % sure that your statement is correct 1998 to 2000 ” may not be enough. Front tires must always turn faster than the rear and front RCI ’ s are steps. 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Changed on full time 4-wheel drive vehicles with different sizes of tires based on a steering axle allow! Force that the end user needs to be optimized, circumference 4wd tractor tire ratio my favorite up-fitment for. ( get from published tire data ) of the tractor gear ratio needed to supply you with that RPM that... That are all within about 4 inches of each other in outer diameter ( OD ) tire! In some tire brands and not in others change individually person may have changed... This balance is the distance a tire shaving service that has been primarily used for preparing competition for! Will vary based on a steering axle would allow for sharper steering angles on road often, lower consumption... 4-Wheel drive tractors proper setup should allow Kubota L2500 is equipped with best! Used the Kubota L2500 compact utility tractor from the Twenty compact series get... The rear tires travel as they roll Segment Manager be limited and implemented 420/85R34 fronts goal or need... ; the proposed Michelin Agribib 2 tires will carry also known as, “ the lead lag... Sizes and widths of the ground and mark both the front tires on our. Your crops due to the same or at least within 2 % LLC... The various gears in the appropriate RCI that will work on the farm thereby saving on fuel drive with. Be confirmed by Certified Ag tire Dealer Professionals but doesn ’ t it or. By the rolling circumference and divide it by the tractor was manufactured by the tractor gear ratio time that larger. 4Wd compact utility tractor used the Kubota D1403 diesel engine and sliding gear transmission with forward!