Odo vs Tire Size? - JeepForum.com
 
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post #1 of 9 Old 02-03-2011, 11:13 PM Thread Starter
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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post #2 of 9 Old 02-04-2011, 12:06 AM
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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post #3 of 9 Old 02-04-2011, 01:04 AM
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Yup.

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post #4 of 9 Old 02-05-2011, 08:23 AM
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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post #5 of 9 Old 02-05-2011, 08:48 AM
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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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post #6 of 9 Old 02-05-2011, 10:40 AM
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post #7 of 9 Old 02-05-2011, 01:41 PM
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.....

The skinny pedal on the right is my friend. the gas gauge is not.
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post #8 of 9 Old 02-05-2011, 02:39 PM
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.

Scott

"life is good at 2 MPH"
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post #9 of 9 Old 02-05-2011, 03:38 PM
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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