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Unread 02-03-2011, 11:13 PM   #1
rtiburon
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Odo vs Tire Size?

Don't the odometers on TJs count off wheel rotation like most cars? It's a silly question but if that's the case won't the odo under-report miles driven the larger the tire size??

I should know this but I thought I'd throw it out there.

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Unread 02-04-2011, 12:06 AM   #2
asknight
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Yes. That's why the speedometer gear market stays so busy.

http://www.jeep4x4center.com/jeep-speedometer-gears/
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Unread 02-04-2011, 01:04 AM   #3
TheBoogieman
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Yup.

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Unread 02-05-2011, 08:23 AM   #4
noise_maker
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Were these always so expensive?

Just seems 75 for a little plastic gear is a bit much. I though I remember them being allot cheaper
(Of course before I needed a new one)
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Unread 02-05-2011, 08:48 AM   #5
Neil F.
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The price was around 30 but it shot up 2-3 years ago. Some ratios faster than others.
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Unread 02-05-2011, 10:40 AM   #6
TheBoogieman
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I usually get mine free here.

http://www.jeepforum.com/forum/f9/ta...l#post10812390
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Unread 02-05-2011, 01:41 PM   #7
monkeee2002
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Quote:
Originally Posted by asknight View Post
Yes. That's why the speedometer gear market stays so busy.

http://www.jeep4x4center.com/jeep-speedometer-gears/
So..... larger tires equal a lower mileage being reported to the odometer, correct? (without re-gearing the axles or the speedometer)

.... Makes me wonder how many miles my Jeep REALLY has now.....
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Unread 02-05-2011, 02:39 PM   #8
Sccafire
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Quote:
Originally Posted by monkeee2002 View Post
So..... larger tires equal a lower mileage being reported to the odometer, correct? (without re-gearing the axles or the speedometer)

.... Makes me wonder how many miles my Jeep REALLY has now.....

Same here. I had stock Rubicon gearing with 35's for 4 years. I went to 5.13's and now the speedometer reads faster. I guess I will catch up eventually.
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Unread 02-05-2011, 03:38 PM   #9
dscabra
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I use this on-line calculator -- doesn't account for gears, but will tell you relative differences in tire sizes.

http://www.discounttire.com/dtcs/infoTireMath.dos
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