Campagnolo C Record Crankset 53 41 Selfextracting 172.5mm NOS Chainrings & Bolts November 18, 2023 admin CHAINRINGS ARE NOS 53/41, AS ARE THE CHAINRING BOLTS. Has 7mm reversed threaded self extracting bolts, THREADS ARE Perfect. Here you will find original pieces of cycling history that cannot be found anywhere else.