The Record groupset this year presents the new Record 10s Ultra Narrow chain that is just 5.9-mm wide. Owing to its dimensions, the new version is lighter and quieter and facilitates adjustment of the rear derailleur. Chain links and pins are hollow so that the chain weighs only 255* g in all.The tests run in our laboratories have shown that traction force, pin retention force, wear, resistance to stretch, torsion and flection are the same as for the Record 10s chain.