[zbgsaa]

I am taking my qc hemi to the track thurs. I am running 28" up front and 26" et drags in the rear what should i set my tire size to. I need an accurate speedo reading as i have a ways to go to the track?

Does it factor in front tire size as wheel? Should i set to 26" or 27"?

 

[HEMI-Now]

2WD? Ignore the front. The SC should be set at the diameter of the rear tires.

 

[sgrizzle]

Rear tires

 

[uncbob]

Rear tires
BUT
Measure it with a level and tape measure to get an accurate reading
DO NOT use the tire size on the tire to calculate it

 

[Superchipstuner]

Correct A Mundo