Just got a 2013 JKUR with BFG All-Terrain T/A KO LT265 70 17 C, they should be 0.453" shorter than OEM BFG Mud-Terrain KM.

I used AEV Procal years ago when I used taller tires, BFG Mud-Terrain KM2, but not sure I really need Procal for this.

Do you guys think that less than 1/2" will throw-off the speedometer and odometer that much? Should I leave it or get another AEV Procal?

 

I would drive over a measures mile and do the math, or drive with a gps on board. Then you will know how far off it is.

 

IMO, I wouldn't bother, your speedo will be off by 0.9 MPH at 65. If you do decide to calibrate it in the future, recommend skipping the ProCal and getting the Superchips FlashCal instead. Its much more user friendly, and upgradable to a full tuner for just a few bucks more.

 

I wouldn't bother either. That's within the window of tread wear.

 

I had to do it. I couldn't help it!

 

Hahaha...I get it.