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post #1 of (permalink) Old 02-19-2003, 09:00 AM
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Speedometer

Hey all....wondering what effect tire size will have on my speedometer....running a TJ with 31" tires....

Jim

I know, rookie question....but I really dont know! [img]images/graemlins/givemebeer.gif[/img]
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post #2 of (permalink) Old 02-19-2003, 09:24 AM
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Re: Speedometer

Im not an expert by any means but here is what I have found out while running 33X12.5X15s. 6-10 miles an hour off depending on speed (Example 40 = 46, 55=65) and my odometer is off .2 tenths [img]images/graemlins/censor.gif[/img] of a mile. I dont know how it changes when you put 31s on but I guess I will find out sometime soon. Hope that helps.
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post #3 of (permalink) Old 02-19-2003, 09:24 AM
 
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Re: Speedometer

Try http://www.off-road.com/tools/gearcalc.html for some useful ratio calculators. A small tire size increase usually won't effect you much. You could also take a few passes by one of those radar checks the police put out to get people to slow down or find an understanding cop that'll check you with his radar.
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post #4 of (permalink) Old 02-19-2003, 09:58 AM
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Re: Speedometer

Thanks for the link! Looks like I'm about 4 miles per hour off....50 = about 55.....

thanks again,
Jim
post #5 of (permalink) Old 02-19-2003, 11:48 AM
 
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Re: Speedometer

You may also want to check out http://www.jeepsunlimited.com/zj/speedo/speedo.htm for info on replacing your speedometer gear to reflect the change in tire diameter. There are several recalibration services out there, but this article explains how to do it yourself pretty easily. They talk about getting a replacement gear from a Jeep dealer but there are other companies out there that can supply the gear. I've heard of people who just move the needle but I don't think that would be very accurate.
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post #6 of (permalink) Old 02-19-2003, 06:16 PM
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Re: Speedometer

Most handheld gps' will give you a accurate reading.
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