Swinging arm 508R CNC monkey fitment +4 +10 +16
New heavy weight arms bigger box section with CNC ends.
Drum or disc fitment.
Box section 54mm x 31mm
Max width between rails at front 138mm
Max with rear when axle passes 165mm
Top chain guide 30mm x 57mm
Rubber bushed arm pivot.
CNC chain adjusters
With rubber swinging arm bushes you only want to tighten the pivot bolt enough so the centre of the bush can still rotate on full swing.
Don’t run the chain too tight or it will rip out the left side bush.
Bigger CC high torque engine will hammer the bushes