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speedo and 31s

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Old 01-10-2010, 06:30 AM
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Default speedo and 31s

hi all i am running 31inch tyres can anyone tell me how far out the speedo will be cheers
david
Old 01-10-2010, 08:34 AM
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well on mine, its pretty close to correct up to about 30mph. then by about 45 its about 5 under (so im actually going 50). pretty much above 45mph, it reads 5 mph under your real speed. hope that helps.
Old 01-10-2010, 08:35 AM
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I am running 31's also & my speedo is right on the money. checked with a GPS. Don't know why
Old 01-10-2010, 08:47 AM
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It seems that my Cherokee's Speedo is off somewhat non-proportionally w/ 31's and stock gearing!

My Speedo seems pretty accurate up until 25 MPH.
When my Speedo says; 30, i'm actually going about 35 MPH...
35- 47
45- 55
55- 65
65- 80...

I've pretty much got used to it over the last 6 months though.
I just try to stay 5 or 10 under, no speeding tickets... yet!


A good link to get your Speedo "dialed in" is;
http://jeepin.com/features/speedogear/index.asp


Hope this helps!

Last edited by guest02; 01-10-2010 at 08:50 AM.
Old 01-10-2010, 10:38 AM
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Is there a way to check if its already been changed for 31's?
Old 01-10-2010, 03:45 PM
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Originally Posted by jfxj67
It seems that my Cherokee's Speedo is off somewhat non-proportionally w/ 31's and stock gearing!

My Speedo seems pretty accurate up until 25 MPH.
When my Speedo says; 30, i'm actually going about 35 MPH...
35- 47
45- 55
55- 65
65- 80...

I've pretty much got used to it over the last 6 months though.
I just try to stay 5 or 10 under, no speeding tickets... yet!


A good link to get your Speedo "dialed in" is;
http://jeepin.com/features/speedogear/index.asp


Hope this helps!
thanks for the link this was my next question
Old 01-10-2010, 08:20 PM
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5 mph slower on the speedo. i checked with gps
Old 01-11-2010, 02:50 PM
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My 99 with 31"s and 3:55's is pretty spot on to about 35. After that it only varies slightly.
Old 01-11-2010, 03:02 PM
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Originally Posted by 99XJDad
My 99 with 31"s and 3:55's is pretty spot on to about 35. After that it only varies slightly.

Same set up.

Most days works great and the speedo is slightly off. Some days the speedo is vacationing. Other days the speedo seems to speak another language. Occassionally the speedo is a fugitive and cannot be found.

Go with the flow.
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