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Old 05-02-2016, 05:58 PM   #1 (permalink)
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95 Geo Prizm Final Drive ratio

Does anyone know the final drive ratio for the 1995 Geo Prizm , 1.6L engine, 3 speed automatic with lock up converter. ? Trying to figure out tire rpms. Do tires increase in radius due to centrifugal force at highway speeds? If I measure the radius of the wheel/tire at standstill, will that be accurate for highway speeds?

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Old 05-02-2016, 06:09 PM   #2 (permalink)
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3.53

http://www.automobile-catalog.com/

Can't post direct link for some reason, good site to stick in your favorites.

If you have tires listed on tirerack or similar sites the often list the rev's per mile.

Last edited by roosterk0031; 05-02-2016 at 06:27 PM..
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Old 05-02-2016, 06:34 PM   #3 (permalink)
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Quote:
Originally Posted by roosterk0031 View Post
3.53

Automobile-Catalog the complete Catalog of Cars, car specs database

Can't post direct link for some reason, good site to stick in your favorites.

If you have tires listed on tirerack or similar sites the often list the rev's per mile.
I wonder if the revs per mile they quote is based on the radius of the tire just sitting there, mathematically calculated based on tire dimensions, or does it represent the actual loaded radius of the tire with the car weight on it?
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Old 05-02-2016, 07:32 PM   #4 (permalink)
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Quote:
Originally Posted by Mcgiiver View Post
Do tires increase in radius due to centrifugal force at highway speeds? If I measure the radius of the wheel/tire at standstill, will that be accurate for highway speeds?
I don't believe the circumference will significantly increase due to centrifugal force, considering the steel belts, but Capriracer would probably be a great resource for this question.

The best way to measure circumference is to mount the tires, bring them up to operating temperature and pressure, and measure the distance the tire travels in one or more rotations. Centrifugal force will be insignificant compared to the weight of the vehicle compressing the tire.
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Old 05-03-2016, 09:11 AM   #5 (permalink)
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Quote:
Originally Posted by roosterk0031 View Post
3.53

Automobile-Catalog the complete Catalog of Cars, car specs database

Can't post direct link for some reason, good site to stick in your favorites.

If you have tires listed on tirerack or similar sites the often list the rev's per mile.
Thank you! I've been looking for this for the new cars, but didn't find it. Exactly what I was looking for.

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