Tire size and gearing ratio - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-14-2005, 09:59 AM Thread Starter
 
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Tire size and gearing ratio

Question in regards to gear ratio for my trail only Jimmy I'm building. I've seen rigs run like this before, but is anyone out there running different sized tires front to back? I picked up a set of 38 TSL's last night, mainly for the rims. Two have some life left and the other two may get some use if I take the grooving iron to them. I have the same situation with the 36 TSL's I had already, two good, two so so. Anyway, what I was kicking around was the idea of running the two good 38's on the back and the two good 36's on the front of the Jimmy I'm building. But, how do you select gearing? I currently have 3:42's in the '86 Jimmy that are most likely coming out. But I have a set of 3:73 in the '76 I'm parting out, a rear 4:10 on another axle, and another set that I am not sure of yet in a '72 Jimmy I'm salvaging parts off. Anyone know what can be mixed and mached to satisfy this switch?
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post #2 of (permalink) Old 09-15-2005, 01:07 PM
 
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Re: Tire size and gearing ratio

simp,y do some math to figure out what distance the tire will travel given one turn of the driveshaft. if any combination works out within a couple of percent you should be good to go
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post #3 of (permalink) Old 09-15-2005, 01:46 PM
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Re: Tire size and gearing ratio

If you don't run it in 4wd it'll go down the road. Then wait until you can match tire sizes. I'm not sure on how friendly it'll be on the road with off-sized tires, but I guess it's worth a shot.
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