I've never even broken my 33x10.5 BFG M/Ts loose in the rain, so I cann't say they're all that much different than the BFG A/Ts that my truck came with. It's all about the driving habits I think.
As for the speedo calibration, from my gps, the speedo is actually closer to correct (almost exactly on) until you get to about 50mph. From there to 75mph I usually just add 2-4 mph to the speedo to get the actual speed. Our trucks have a conservative speedo from the factory that will read 2-5mph faster than your actually going. The odometer on the other hand was spot on, and now is reading a little slow. To fix it, all you have to do is multiply your milage by (33"/31")=1.065. You can't change your programming very easily because the factory computer doesn't have an option to go above 31" tires. I thought about playing with gear ratios and tire sizes to get an effective ratio that matches, but the axle ratios they have available are limited too. The only way you could do it is to get a chip from someonen like Bama. I just do the math when I need to, and have everything written down so I don't forget when I put the tires on (milage).
- 2004 FX4, Level II -- SOLD --
- 1996 Bronco, 5.8ltr, SAS, lockers, 35s, and some other stuff