Custom tune @ tire size question
#1
Bullitt Member
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Custom tune @ tire size question
Not that I am running a staggered setup (285/40-18 X 255/45-18) what tire size do I put in when requesting new tunes?
I assume the front tires due to the speed sensor? Not sure though....
I assume the front tires due to the speed sensor? Not sure though....
#3
Team Mustang Source
Join Date: December 23, 2004
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I always assumed the rear tire size as I think the speed sensor is located where it can read the transmission output shaft? but I don't know for sure. Good question.
#4
Mach 1 Member
Join Date: April 11, 2006
Location: Ohio
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In your case, it doesn't matter which size you enter, as both tire diameters are virtually identical, less than 1% difference.
#5
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#8
Cobra Member
Rear tire size diameter is the issue. I used my GPS to dial it in exactly by mph. Even the tuner setting was off when I put on the new tires by putting in the new diameter. I had to do a little trial & error. Speedo is now 100% correct.
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