Sigma Slipper Clutch “33”: Manufactured from high quality hard anodized aluminum, Sigma Slipper Clutches supplied by Spears Racing. Feature a six-ramp automatic ball bearing lift mechanism. Plug n’ play installation – no subsequent adjustment is required. Designed to use standard clutch plate packs and will need SP20-650H Springs . Some protection against excessive over reving if the rider accidentally changes down too many gears going into a corner.
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