I purchased an l3000dt about a year ago with r4 10-16.5 front and 420/70-24 rears. So that is not the correct size tires for the tractor, l3010, 4310 etc had them, and the ratios are off a bit from the factory ratio. So I am getting the correct ratio for that tractor to be .67(7-16, and 11.2-24). So I am thinking of putting 8-16 AG and rims on front(Rc 91) to go with the 420/70-24(rc 136). And maybe in the future putting 12.4-24(rc 135) on the current rims that are 12" wide. Anyone see any issues in doing this?
Tire ratios
- Thread starter JNb
- Start date
Don't mix R1's and R4's. The overall height is different no matter what is stamped on the sidewall.
I was choosing the tire size based on rolling circumference (rc), so I didn't think the type of tire mattered as long as you had the rc ratio correct. But I'm shure there is more to it that I don't know about.
As I have read, the tire type is irrevalent. The RC is the governing factor to determine the front wheel lead ratio established by the tractor manufacturer. The OP is correct in his approach toward solution. At times, the max ratio may be utilized by the manufacturer in offering tire sizes in different style tread designs.
I believe allowable ratios are printed in the OM by all or most mfg's This is especially critical for mechanical front wheel assist drives which are often mischaracterized as 4WD. A true 4 WD simply requires the same shoes on all 4 hubs. Many fastracs are an example of true 4 WD (current 4000 series)
I believe allowable ratios are printed in the OM by all or most mfg's This is especially critical for mechanical front wheel assist drives which are often mischaracterized as 4WD. A true 4 WD simply requires the same shoes on all 4 hubs. Many fastracs are an example of true 4 WD (current 4000 series)
North Idaho Wolfman
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Yes you can most certainly use different tire types, as long as like some others have said you stay in the same ratio range.
I've has R4's on the fronts and R3's on the rear for years, and not an issue.
I've has R4's on the fronts and R3's on the rear for years, and not an issue.
North Idaho Wolfman
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You never use overall height to determine if a tire will work in ratio with its mate.
RC is a definite number that takes into account tire design, squash and real world factors.
To make things more complicated I found the info of the gear ratio of the front to back which is 1.6363 which puts the stock tires (7-16, and 11.2-24) at an 11% lead which is quite a bit. Has anyone done the math on tire sizes based on the gear ratios of the tractor? I thought it was best to have a 1% to 5% lead.
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I do know from actual experience that running incorrect diameter tires on the front (and rear) causes accelerated tire wear in 4wd. While I don't usually run in FWA, I do enough to notice the wear. Typically I get one set of R1 rears to 2 sets of R1 front's.
JNB, where did you find the ratio for your tractor?
I'm curious to know what the ratios are in my L3130 and L4740 but haven't seen it listed in the operating manual (as someone suggested)... It's possible it's in there and I overlooked it.
I'm curious to know what the ratios are in my L3130 and L4740 but haven't seen it listed in the operating manual (as someone suggested)... It's possible it's in there and I overlooked it.
85Hokie
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Most of the time the fronts "lead" the rears, that's most of the time
I think the ol rule of thumb is 2% or less on ratio, after a while the tires will correct themselves by wearing faster on those that lead thus reducing the RC a bit as they wear.
Most of the time the fronts "lead" the rears, that's most of the time
I think the ol rule of thumb is 2% or less on ratio, after a while the tires will correct themselves by wearing faster on those that lead thus reducing the RC a bit as they wear.
Least in my case, the front's are a whole lot less expensive than the rears are.
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I got the gear ratio right from Kubota, and the tires that come from factory is 7-16 front ( Rc of 87) and rear 11.2-24 ( rc of 128) the chart that I got with gear ratios has out her models on it as well, I will look if those models are on it'd for 200mph.
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North Idaho Wolfman
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I will see if I can make it show up on here better, as I can see it fine on my computer, but not when I look at it here. But I think I have answered my own question on this, and I do believe the gear ratio of this tractor is 1.6363. I measured the rolling distance of the current front tires(10-16.5) by marking them on the ground, and in 2wd the distance was 92" and in 4wd it was 84.5". So the front are leading by about 9%. That is with 420/70-24 and 10-16.5 tires.