Getting ready to set up my procal and was wondering what tire size you guys are putting in for the Goodyear Wrangler Duratracs size 315/70/17? The Goodyear site says they are 34.4 diameter but procal site says don't use manufacturers size. Should I just take my own measurement or use the 34.4? What are you guys programming in? Thanks

 

when i set up my speedo with superchips flashpaq i think i went all the way down to like 33.5 or somewhere in that vacinity

 

Same with me. I had to use the 33" size on my 315/70/17 Procomp Xtreme Mud Terrains to get it to match up with my GPS.

 

Are you guys taking a physical measurement of the tire height on the vehicle like the Procal manual says and that is not working correctly?

 

Anybody have any definite numbers that are running this setup?

 

Same for me.

You gotta use physical height. Measure from ground to top of tire. Or, if you really wanna be anal, measure from the ground to center of hub and multiply that by 2 for the actual rolling diameter.