All geared Vespa models produced up to 1994 use a castle nut to hold the clutch in place on the crankshaft. The SIP castle nut is similar to the OE PIAGGIO item. We have redesigned and optimised it slightly with an increased thread length, precise dimensions to improve the castle nut adapter contact and is produced from high quality tooling steel for added durability.
OEM Nummern (dienen zu Vergleichszwecken) 20375 (PIAGGIO)
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