Campagnolo 10 Spd Chorus Ultra Narrow Chain 

These new dimensions make it lighter and more silent and facilitate adjustment of the rear derailleur. The links have been lightened so that the chain weighs only 269g in all. The tests run in laboratories show that traction force, pin retention force, wear and resistance to stretch, torsion and flection are the same as for the Record 10 speed chain - 10 speed chain - Just 5.9mm wide - Ni-PTFE Finish - Ultra?Drive - HD-Link for Ultra Narrow chain - Lightened links