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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

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Old 08-06-2010, 04:07 PM
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DKW 86 DKW 86 is offline
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Tire? 235/75R15 or 31/10.50-R15?

Pros or cons?

Specifically how do the 31/10.50-R15 do on wet pavement? Are they sliccker than normal?

What about milieage?

I really think the 31/10.50-R15 are the better looking tires on Dents, but are they too much trouble?
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Old 08-06-2010, 04:31 PM
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Your 235/75R15 is less than 29" tall, so there is going to be about a 2" diff. in tire height. Your speedo reading of 65MPH will actually be about 69MPH, without being re-calibrated. Your mileage will depend on your gearing, because that will be affected. A 265/75R15 is virtually the same size as a 31/10.50 -R15, and will give you more tire choices. I agree, the bigger tires do look better.
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Old 08-06-2010, 06:47 PM
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I've had 31x10.50 for almost 7 years and have never had a problem with them. They have good traction and do fine on or off road. I am, however, going to get 33x12.50 in the near future. My tires are cooper discoverer by the way.
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Old 08-07-2010, 08:43 AM
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Thanks for the input guys. I had a kid in a Jeep with 31/10.50s hit me once right after a rain and he tried to pass it off as the tires fault. Been shy of them ever since. He hit me so hard, he cut my bumper in two!
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Old 08-07-2010, 11:04 AM
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That would be driver error, not tire fault. The only way I could see it as tire fault is if they were bald tires or flat. A 31X10.50 is not that big of a tire.I had a Wrangler with 32X11.50's and it stopped fine. Heck the Rubicon's come stock with a metric tire that is pretty much a 32" tire.
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Old 08-07-2010, 12:50 PM
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31s are still tiny, you wont have any problems with them. I have 33 12.50s on my F-150. Also had a daily driver 93 Bronco that I had 32 11.50s on for 3 years. No issues at all.
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Old 08-07-2010, 04:41 PM
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Originally Posted by Blown 331 View Post
31s are still tiny, you wont have any problems with them. I have 33 12.50s on my F-150. Also had a daily driver 93 Bronco that I had 32 11.50s on for 3 years. No issues at all.
Thanks guys, i really needed to hear all this. 31/10.50 it sounds like now!
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Old 08-07-2010, 04:41 PM
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