The Campagnolo Record 10 chain is 5.9mm wide - .3mm narrower than the first edition of this chain. The narrower width greatly improves shifting, silences the drivetrain and believe it or not - it's stronger. Works perfectly with all Campagnolo 10-speed drivetrains. A well-tuned Campagnolo drivetrain can run virtually silent with this chain. This is Campy's best 10 speed chain.