Slomo said:I imagine they can't be less than a given thickness by design and still work, is 1" the smallest? .
Marlin sells a 3/4" spacer that I used on the rear of my 60. The back of the spacer was machined out to allow for the wheel studs to 'protrude' a bit into the spacer. I doubt you could go much less. Maybe 1/2", MAYBE.
Definately don't use spacers that just slip on over existing studs. Always use the replacement stud variety.
I stand corrected. 