Campagnolo C-Record 177.5 DRIVE SIDE ONLY Crank Square Taper 53 / 39. Here is a lightly used Campagnolo C-Record 177.5mm DRIVE SIDE ONLY crankarm with 53/39 original chainrings. Square taper BB interface and 9/16 pedal threads in excellent condition. Clean with light wear shown in photos. Includes original crank bolt. _gsrx_vers_1730 GS 9.9.4 (1730).