Trek Rhythm Comp KnockBlock MTB Bike Stem

31.8 mm of durable control Run your favourite 31.8 mm clamping diameter handlebar on a bike with Knock Block with the Rhythm Comp 31.8. It adds Knock Block compatibility to a durable stem with multiple lengths to let you fine-tune the fit to your ride.Key Features:Get 31.8 mm handlebar compatibility with your Knock Block system Also compatible with standard headsets and spacers The Knock Block system protects the frame from impacts by fork and handlebars by eliminating over-rotation of bars Available in a wide range of sizes for today’s mountain rider See Service Parts for other Knock Block parts Approved for carbon bars and steerer tubesSpecification:Size0 deg. x 50mm0 deg. x 60mm0 deg. x 70mm0 deg. x 80mmRise0 deg.0 deg.0 deg.0 deg.Length50 mm60mm70 mm80 mmSteerer outer diameter 28.6 mm (1-1/8″)28.6 mm (1-1/8″)28.6 mm (1-1/8″)28.6 mm (1-1/8″)Clamp31.8 mm31.8 mm31.8 mm31.8 mmTypeKnock blockKnock blockKnock blockKnock blockAccessory compatibility Not applicableNot applicableNot applicableNot applicableMaterialAluminiumAluminiumAluminiumAluminium