Tensioners are needed as the belts strip as the power from a 4.5, 5.5, 6.5 and 7.5 is too much for it to handle and it snaps or strips. I just took the design ideas from the zxs which was a faultless design where ive still been unable to damage a belt and put that design into the zxrs and also into the zxr plastic gearbox.
Only zxs issue was the slipper couldnt handle the brushless power
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