changing rims to 18's

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Sep 5, 2013 | 03:20 PM

chevy94c

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From: Mass

changing rims to 18's

I am thinking of going to 245/40/18 and 275/35/18. Will my speedometer need to be corrected?

Sep 5, 2013 | 03:37 PM

DemonicZ

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From: Reno,NV

Quote:

Originally Posted by chevy94c

I am thinking of going to 245/40/18 and 275/35/18. Will my speedometer need to be corrected?

245/50/16 OD- 25.65"
245/35/18 OD-24.75"
275/35/18 OD-25.58"

Only thing that will really be affected will be your front wheel speed

245/50/16 speed @ 100 KPH=62.14 mph
245/35/18 speed @ 100 KPH=59.97 mph
275/35/18 speed @ 100 KPH=61.97 mph

245/35/18 speed variance is -3.61% too slow
275/35/18 speed variance is -0.26% too slow

I always use 1010tires.com for a tire size calculator. I always use stock wheel size 245/50/16 or 275/40/17 because that is what the speedo is calibrated for then you can select up to 4 different tire sizes and compare all aspects of the tires side by side.

oh and the answer to your question is no you won't have to re-calibrate your speedo.

Sep 6, 2013 | 05:46 PM

chevy94c

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From: Mass

Thanks for you help

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