9in axle length

If you have it set with tires/wheel under the car, believe the tape and go from there. Tighten up on your measurements, 1/2' variation on that is a pretty big miss. If you are going to miss, miss on the short side. It's easier to put a space on than widen the wheel wells or car! :)

Dr Diff axle length calculator.
http://www.doctordiff.com/axle-calculator/

Change the brake gap length and punch in your tape length wheel mount face to face and run with it.

I got 44.88" using the 2.81 and 50.5 total width

SWEET CAR!!! Love the white with black stripe.