I have 2009 ram with tire pressure monitoring system and will be putting on bigger tires. Does anyone know if i will need to have computer reset for bigger tires. I have 17" stock rims with P265/70R17 and plan to put on LT285/70R17 tires. Thanks

 

The bigger tires will throw the speedo off by a little bit. Probably by about 3mph at 70mph. This is just a guesstimate, not factual info. If it were me, I wouldn't bother getting the computer calibrated and live with it.

 

To follow that up.....it won't mess with the TPMSensors

 

yeah, beck. its not worth messing with at such a little tire size difference.

now if you went to 33's or something then maybe....

 

It's a minor difference and not worth recalibrating. Mine is off 3% thanks to tires and I'm just going to wait on the Superchips programmer.