Trek Electra brand Bontrager brand Trek Travel
View our accessibility statement
  • Bontrager Rhythm Comp Knock Block Stem-No Packaging
Bontrager Rhythm Comp Knock Block Stem-No Packaging
Bontrager Rhythm Comp Knock Block Stem-No Packaging

We’ll make this a great experience

It’s our mission to provide you with world-class hospitality every time you visit us online or in-store. We’ll always take care of you. It’s the Trek way.

Awesome free shipping options

All accessory orders over $49 ship to your home for free, and all accessory orders ship free to your local retailer for in-store pickup.

30-day Unconditional Guarantee

If for any reason you’re not 100% happy with your online order from trekbikes.com, you can return it in like-new condition within 30 days. No questions asked.

Learn more

Bontrager Rhythm Comp Knock Block Stem-No Packaging

Model W565235
$49.99 Comp. Value Sale price

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

Confirm delivery options

Address details
  • Note: We do not offer delivery to PO boxes, hotels, and freight forwarding addresses. Bikes cannot be delivered to FPO/APO addresses due to size restrictions on deliveries.
Direct-to-home shipping

Get your most accurate shipping costs. We offer free ground (for orders over ), 2-day, and overnight shipping options.

Premium home delivery

Confirm you’re in the selected retailer’s delivery area.

Find a retailer

Pricing details

Retailer price

Retailer pricing applies when you purchase goods online that the shop has in stock today. Order is subject to retailer acceptance.

Comp. Value

Our “Comparable Value” (Comp. Value) prices are based on the prices charged by Trek or other retailers, in-store or online, for the same or similar items. In most cases, this is a price at which Trek has offered the item for sale, and also the MSRP we provide to third-party resellers based on the prices of competing items in the market.

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
  6. Approved for carbon bars and steerer tubes

All your favorites, all in one place

Get all your favorite apparel from over 80 of the world's best cycling brands delivered right to your doorstep or local Trek retailer when you shop our curated online collection. If you're not 100% satisfied, you can return your purchase within 30 days for a full refund.

Shop all gear

You might also like