Hi,
If I put 265x75x16 on my 97 excab,in place of the 245's, they are around an inch taller. Would I really need to get the computer recalibrated?
Thanks,
Bob B

nope, your speedometer will be off though.

use this to find out how much
http://www.miata.net/garage/tirecalc.html

Great!
Thank you. The well worn originals are actually reading fast by several miles per hour. So it might equal out ok.
Bob B

nope, your speedometer will be off though.

use this to find out how much
http://www.miata.net/garage/tirecalc.html
I hope you guys are right, i just had someone tell me that if i do not get my 265s off and put my 245s back on i will blow my trany. can anyone tell me that this is not true for sure.

No you wont' harm the transmission, thats BS.

Excerpt from GM tech bulletin:

A truck that has different tires and wheels will have Engine power/performance concerns, Transmission shift concerns, Speedometer registered speed concerns, and Cruise Control concerns.

The Engine Control Unit (ECM) and Transmission Control Module (TCM) use (RPM) and (VSS) inputs as operational parameters for engine torque, transmission shifting, cruise control operation and speedometer indicated vehicle speed.

Calibrations for different tire/wheel combinations are not available.

Therefore changing of tire and/or wheel size should not be undertaken by dealerships or truck owners.