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Bigger tiers qestions here?

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Old Feb 18, 2012 | 03:04 PM
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Default Bigger tiers qestions here?
Ok so I just got bigger tires for my 2001 wj
I know it makes your speedo off but what about your rpm?
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Old Feb 18, 2012 | 03:29 PM
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bigger tire = lower rpm. say you had a 31 and went to a 37. you have to travel that additional 6 inches to complete one full revolution.
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Old Feb 18, 2012 | 03:48 PM
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I'm talking engine revs because when in doing 60mph speedo read(65mph acctual) my revs says way lower then before the big tiers at 65
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Old Feb 18, 2012 | 05:01 PM
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I'm assuming that you're referring to the tachometer, correct?
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Old Feb 18, 2012 | 09:23 PM
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Originally Posted by CONDEMNED
I'm assuming that you're referring to the tachometer, correct?
Yes
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Old Feb 18, 2012 | 09:42 PM
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Originally Posted by alexallen86

Yes
Rpm wont change, it will still read correct
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Old Feb 18, 2012 | 10:25 PM
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Originally Posted by CONDEMNED
bigger tire = lower rpm. say you had a 31 and went to a 37. you have to travel that additional 6 inches to complete one full revolution.
somewhat true but not exactly. 6" more diameter doesnt mean 6" more circumference. but same basic idea
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Old Feb 18, 2012 | 11:31 PM
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Originally Posted by N20jeep

Rpm wont change, it will still read correct
Weird that I'm getting worse gas mileage on less rpm then
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Old Feb 18, 2012 | 11:33 PM
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Originally Posted by alexallen86

Weird that I'm getting worse gas mileage on less rpm then
That's because your engine has to work a little harder to turn the bigger tires...
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Old Feb 18, 2012 | 11:36 PM
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Just guessing, but think it takes more power to turn larger and heavier tires. yea, what he said, I'm slow on the keyboard.
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Old Feb 19, 2012 | 01:49 AM
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Bigger tires will read a lower speed than stock.
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Old Feb 19, 2012 | 01:37 PM
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I know that it's common to lower your gear ration in your duffs after putting bigger tiers on what would be recommended from stock on the wj?
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Old Feb 20, 2012 | 03:11 PM
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Anybody?
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Old Feb 21, 2012 | 02:22 AM
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read this page

http://www.superlift.com/library/gears.asp
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