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Old 10-31-2012, 11:16 AM   #1
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New tires / speedo confusion

Went to Wally World yesterday and purchased 5 new Goodyear Duratracks for my LJ. Great price BTW.

Now for the confusion part..............

I have a stock LJ, it came with 30 - 9.50 x 15's, the speedo has always been off (slow) by about 3 - 5 mph, to go 55 mph I had to be doing 60+/- on the speedo.

I installed 31 - 10.50 x 15" Duratracks, had the GPS with me to see how far off the speedo was going to be on the way home and it was dead on at all speeds.

Can someone tell me why? I'm not complaining mind you, that's $80 +/- dollars that I won't have to spend.

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Old 10-31-2012, 11:21 AM   #2
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No idea but I would like to know how much the tires cost you.

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Old 10-31-2012, 11:36 AM   #3
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$158/ea. plus balancing, valve stems, tax, road hazard warranty, etc.

Most other tire stores wanted $200+/ea., plus the other stuff.

Well that $80 I saved was just spent on head light conversions with www.4wd.com, Oh well the Jeep and my motorcycles suck up more money than my boat does ;-(
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Old 10-31-2012, 12:07 PM   #4
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I thought walmart only carried the goodyear authorities? Thats what they told me when i asked if they had duratracs...
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Old 10-31-2012, 12:21 PM   #5
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Because the speedo gear u have is for 31's I would imagine. Sounds a little back works to me, u should have been more off on your speed with bigger tires. But without knowing ur gears and what tooth speedo u have I would just guess ur jeep is set up for those tires.
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Old 10-31-2012, 12:54 PM   #6
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How did you get them for 158? On line price shows 226 ea.
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Old 10-31-2012, 01:05 PM   #7
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My wife was shopping for a crib for my neice, she always parks near the auto center, she saw this pile of tires by the door and called me on the cell phone and asked what size tires the Jeep needed.

I told her and she said Wally World has a pile of them by the door for $158/ea. I was there 1 hour later buying 5 new ones.

The cheapest place I had found was Costco and BJ's for about $209/ea.

I couldn't tell you what Speedo gear I have, but I do have 3:73 gears and Dana 44's front and rear ;-)

The Duratracks are noisy compared to the Mesa's that were on there.
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Old 10-31-2012, 01:35 PM   #8
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thats a good price. i got 33 12.5 15 duratracs for 200ea
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Old 10-31-2012, 01:51 PM   #9
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Quote........
I have a stock LJ, it came with 30 - 9.50 x 15's, the speedo has always been off (slow) by about 3 - 5 mph, to go 55 mph I had to be doing 60+/- on the speedo.


With 33's and no speedo gear change, my speedo is always indicating slow, meaning when I'm going 55 indicated on speedo I'm actually going 62 GPS. This is opposite of what you said.

So with that in mind, if yours was indicating opposite of mine and you put bigger tires on then it should be closer to actual speed

You must of had a speedo gear for larger tires then you were running....
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OK.... What next?? 2002 Wrangler Sahara, 4" lift with 33's

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Old 10-31-2012, 03:09 PM   #10
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Quote:
Originally Posted by Crowbar50 View Post
Quote........
I have a stock LJ, it came with 30 - 9.50 x 15's, the speedo has always been off (slow) by about 3 - 5 mph, to go 55 mph I had to be doing 60+/- on the speedo.


With 33's and no speedo gear change, my speedo is always indicating slow, meaning when I'm going 55 indicated on speedo I'm actually going 62 GPS. This is opposite of what you said.

So with that in mind, if yours was indicating opposite of mine and you put bigger tires on then it should be closer to actual speed

You must of had a speedo gear for larger tires then you were running....
+1 for me too
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Old 10-31-2012, 03:14 PM   #11
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Your speedo was fast compared to your actual speed. The replacement of the 30" tires with 31" increased your roll-out or circumference of the tire which corrected your speedo.
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Old 02-21-2013, 01:52 PM   #12
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I have 31s on my 97. At higher speeds my speedo is off by about 5. Anyone know what gear I need?

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