Which BS at 8.75 BBP?
Which actual axles do you have?
Because if you have original SBP axles that have been re-drilled for the BBP then you still have the narrower width. And you won’t be able to use those 10x2.5” brakes either.
The axle flange standoff distance is unique to the SBP axles, so the backing plate offset is different from the SBP drums and the BBP drums.
If you have re-drilled SBP axles you need to re-drill a set of SBP drums
and use the SBP backing plates, you can’t use the BBP backing plates or drums.
As for the backspace, a 4.5” backspace usually works best with the BBP axles. A 4” backspace can be used with the SBP axles.
Which actual axles do you have?
Because if you have original SBP axles that have been re-drilled for the BBP then you still have the narrower width. And you won’t be able to use those 10x2.5” brakes either.
The axle flange standoff distance is unique to the SBP axles, so the backing plate offset is different from the SBP drums and the BBP drums.
If you have re-drilled SBP axles you need to re-drill a set of SBP drums
and use the SBP backing plates, you can’t use the BBP backing plates or drums.
As for the backspace, a 4.5” backspace usually works best with the BBP axles. A 4” backspace can be used with the SBP axles.
