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Bontrager Rhythm Comp Knock Block Stem-No Packaging

$49.99 Model 28828

A reliable 31.8mm aluminum MTB stem available in multiple lengths to fit your bike.

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31.8mm of durable control

Run your favorite 31.8mm 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.

Product details

  1. Get 31.8mm handlebar compatibility with your Knock Block system
  2. Also compatible with standard headsets and spacers
  3. Knock Block system protects frame from impacts by fork and handlebars by eliminating over-rotation of bars
  4. Available in a wide range of sizes for today's mountain rider
  5. See Service Parts for other Knock Block parts

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Size 0 deg. x 50mm 0 deg. x 60mm 0 deg. x 70mm 0 deg. x 80mm
Rise 0 deg. 0 deg. 0 deg. 0 deg.
Length 50mm 60mm 70mm 80mm
Steerer outer diameter 28.6mm (1-1/8") 28.6mm (1-1/8") 28.6mm (1-1/8") 28.6mm (1-1/8")
Clamp 31.8mm 31.8mm 31.8mm 31.8mm
Type Knock Block Knock Block Knock Block Knock Block
Material Aluminum Aluminum Aluminum Aluminum
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, and materials.
Weights are based off Trek pre-production products at time of publication. Weights may vary in final production.

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