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Old 07-07-2010, 01:29 PM   #1
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Speedometer Calibrations

I just moved up from a 30x9.5x15 tires to 31x10.5x15 tires. Stock suspension system, rims, etc. Should I find a place to re-calibrate my speedometer or is it worth it? Can this be done and who would do something like this?

So far I can't figure for sure, but I don't see a huge difference.

Any thoughts or experiences are appreciated?

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Old 07-07-2010, 01:31 PM   #2
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It's an easy 5-minute job to snap in a new speedometer gear that will recalibrate your speedometer. It takes nothing more than a 1/2" wrench and no special skills. Here's how... Changing Your Jeep Speedometer Gear

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Old 07-07-2010, 01:41 PM   #3
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Very Interesting. Thank you so much for the info. I wonder what this project will cost in the long run. I am glad to see that it isn't that big of a deal!
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Old 07-07-2010, 01:44 PM   #4
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If you can find the gear cheap, it won't be much, but last I saw, gears were running about $85, new. Run with a gps first to see if you even need it. That's a pretty minimal change. Heck, mine is 5mph off, I just accept it for what it is..
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Old 07-07-2010, 01:57 PM   #5
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The GPS idea is a good once.....but my GPS is in nauticle mph since it is on the boat! LOL
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Old 07-07-2010, 02:04 PM   #6
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Run along side someone who's speedo is accurate. Borrow a gps. My point is that I doubt you are off much at all.... 2mph at most.
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Old 07-07-2010, 02:05 PM   #7
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i used to use a GPS, haven't had a working speedo in over a year, highly overrated if you ask me, I just go by my rpm
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Old 07-07-2010, 02:21 PM   #8
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The GPS idea is a good once.....but my GPS is in nauticle mph since it is on the boat! LOL
Odds are that you can easily (temporarily) just change it via its configuration page to read mph instead of knots.
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Old 07-07-2010, 02:48 PM   #9
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Yes....I can. Then again I don't want to do much because since the last time I changed anything on the GPS I have logged 3000 NM cruising the Chesapeake Bay in my boat . That is fun stuff.
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Old 07-10-2010, 10:06 AM   #10
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Just drive 2-5 mph under the speed limit per the speedo, thats what I do with the same 31 10.5. At 60 I know I'm at 65 mph. jj
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Old 07-10-2010, 10:13 AM   #11
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Weird thing. My Jeep came with the 30" canyon tires and has the stock speedo gear for the 30" tires, green I think. When I put 31s on it the speedo is 2-3 MPH slower than what I am actually going. I have determined this both with my GPS and those annoying cop signs on the side of the road that tell your speed. SO when the speedo says I am going 33 mph I am really going 30. Seems backwards to me.
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Old 07-10-2010, 10:15 AM   #12
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I drive slow right now, but that's probably because my tires are so heavy. But i'll heed the advice and drive about 2-5 miles per hour below. Maybe my mechanic can tell me because he too has a lifted jeep as well with 4 knobs....
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Old 07-10-2010, 10:22 AM   #13
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Weird thing. My Jeep came with the 30" canyon tires and has the stock speedo gear for the 30" tires, green I think. When I put 31s on it the speedo is 2-3 MPH slower than what I am actually going. I have determined this both with my GPS and those annoying cop signs on the side of the road that tell your speed. SO when the speedo says I am going 33 mph I am really going 30. Seems backwards to me.
What do your tires actually measure? My 31's only measured 29".... That may have something to do with it....

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