Campagnolo record TANDEM crank arm dated 1974. THIS IS A LEFT ARM BUT FOR THE RIGHT CAPTAIN SIDE WITH RIGHT HAND THREADING FOR TANDEM BICYCLES, THATS WHAT THE D DENOTES ABOVE THE PEDAL HOLE. 170mm 9/16 pedal thread. Vintage NOS Bicycle Parts. For thousands of new old stock, vintage and modern bicycle parts. We’re the online bike parts dealer for rare components and spare parts for your restoration and repair. Here you will find original pieces of cycling history that cannot be found anywhere else. Please use at your own risk. We decline liability for any damages resulting from use of these items, most of which are decades old. Vintage NOS Bicycle Parts is an environmentally friendly business. We use recycled packaging & materials the large majority of the time and nothing in our store has been manufactured for us or is currently being made for sale.