Very Rare Campagnolo Mexico Crank Set Length: 172.5mm Pista Style - Machined for a Single Chainring Based on 1049/A Record Cranks with Engraved Campagnolo Shield Factory Machine & Highly Polished, Polished Flutes and Fully Machined Slotted Arms. You can see your reflection in the Polish! For Square Taper BB Pedal: 9/16 - 20F Thread Weight (as shown): Arm - 171.6g & Arm/Spider - 251.3g Sold w/o Chainrings, see my separate listings (will bundle). Using on a single ring TT bike in the late 1980's