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Old 08-23-2011, 06:29 PM
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Tire size and rev question

With the stock tires and wheels on the jku rubi, at 65 mph it sits at 2500 rpm.

My question is: when I go with bigger tires, will the rpm rise or drop at 65 mph??

I used search but couldn't find anything, and I'm just really curious!

While I'm at it, how small of a wheel can fit on the jku? 15/16?

What kind of backspacing and such is necessary? Right now I'm debating between 35's and 37's... Leaning towards 35's bc it's my dd, but don't want to be hating myself wishing I had gone with the 37's!

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Old 08-24-2011, 06:23 PM   #2
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Here's a tire size calculator you can use to see how far off your speedo will be with a different tire size: (Metric = to 35" tire would be 325/70R17)

Tire Size Calculator - Discount Tire Direct

15" is the smallest you can fit on a JK or a JKU. If you think you will eventually want to run a 37" tire I would recommend running a 16 or 17" wheel from the start. 37"+ tire options are better for 16" and 17" wheels than 15".

For backspacing look for a wheel that is around 4.75 or less (4.5" is common). You could run up to a 5.25" backspace if you only plan to run up to a 35x12.50 but if you want to go any taller than 35" tires you'll need a lower BS. (4.75 or lower will work well with 35 or 37" tires)

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Old 08-27-2011, 09:34 PM   #3
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going with larger tires will lower the RPS at the same speed as before,once you correct the speed O.
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Old 08-27-2011, 09:55 PM
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Quote:
Originally Posted by Keith Behrnes View Post
going with larger tires will lower the RPS at the same speed as before,once you correct the speed O.
Thank you!

The post before was helpful, but didn't tell me exactly what I needed. Thank you too though!
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