Quote:
Originally Posted by trf14
Does anyone know how the TRF501x pistons compare with those of a B4?
thx
the First TRF-pilot :-) (back in '89) 
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If you have a look on the oOple setup sheet I compare the pistons to AE B4 ones directly. I am not sure the hole sizes are a direct comparison, but they aren't far off.
Thats how I translated my BJ4we setup easily to the 501X.
The Machined pistons are not worth getting, they change the damping too much (too hard) over the kit ones.. so you need to readjust your setup to suit.