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Old 12-18-2012, 09:26 PM   #1
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Rims size

I was wondering on my 08 jeep wrangler

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x that i just got 4 weeks ago that's sitting on factory 18 inch rims if I could go down on the rims sizes if it will throw off my speedometer? Thanks

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Old 12-18-2012, 09:28 PM   #2
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your wheel size won't affect your speedometer, but a change in tire size will. If you got a smaller wheel, but put the same size tire on that wheel, then your speedo will be the same.

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Old 12-18-2012, 09:40 PM   #3
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Okay I thought so just making sure. And 16inch is the lowest you can go right?
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Old 12-18-2012, 09:42 PM   #4
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you can go as low as 15", so long as it's an alloy wheel. Steel wheels you can go as low as 16".
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Old 12-18-2012, 09:44 PM   #5
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Ok just have to find some rims that I like now
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Old 12-18-2012, 11:29 PM   #6
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Quote:
Originally Posted by JKralph View Post
your wheel size won't affect your speedometer, but a change in tire size will. If you got a smaller wheel, but put the same size tire on that wheel, then your speedo will be the same.
Just so the OP is clear; What JKralph means here is that the over all tire diameter is the same.

For example if your over all tire diameter is 32" on an 16" wheel, your speedometer wouldn't be any different than if you had a 32" tire on an 18" wheel.

However, if you had 255/70R18s and then went with 255/70R16s then you'd have a discrepancy in your speedometer.

255/70R18 would be approximately a 32" tire.
255/70R16 would be approximately a 30" tire.

So, going from the first hypothetical tire to the second would give a speedometer error of about 6%. Or, when the speedometer was at 55mph, the actual speed would be about 51.7mph.
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Old 12-18-2012, 11:52 PM   #7
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Thanks! That helps out alot

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