I think Ive got the measurement in the disc brake thread over in Big Bolts... but can't find it. I'll do some searching, thinking it's in the 26" neighborhood..
Same up to 2 ton.

Grigg

Last edited by Grigg; 06/11/2012 3:45 PM.
•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-