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Shop | Components | Drivetrain | Chain Keepers | Chain Keeper

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Chain Keeper

The Chain Keeper is a guide to keep your chain right where it belongs. Mounted in place of a front derailleur, the Chain Keeper works with single chain ring drivetrains using a narrow chain. The chain block surrounds the chain as it meets the chain ring and prevents it from skipping off.

$88.50

Clear

Technical Information

  • Material
    6061 Aluminum
  • Weight
    69g
  • Finish
    Anodized
  • Anodized Color
    Black, Purple, Silver
  • Clamp Size
    28.6mm, 31.8mm, or 35.0mm ↓

    The clamp diameter is the outside diameter of the seattube. The seattube must be circular in profile where the Chain Keeper attaches.

    28.6mm is equivalent to 1-1⁄8".
    31.8mm is equivalent to 1-1⁄4".
    35.0mm is equivalent to 1-3⁄8".
  • Chainline Range
    34-55mm
  • Instructions
    Download

Product Story

The Chain Keeper clamps on to the seat tube of the frame. The portion of seat tube where the clamp mounts must have a circular profile and a diameter of 28.6, 31.8, or 35.0mm, (+/-0.5mm).

Designed with adjustability in mind, the Chain Keeper can accommodate a range of chainline measurements and chain ring sizes.

Note: This is not designed for downhill, freeride, or big hit use.

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We’re super lucky to have a network of great bik We’re super lucky to have a network of great bike paths in Chico, one of which follows an old railroad route and leads right to the back gate of our shop! Bike commuting is awesome, and we figured it was time for us to pitch in, so we adopted a little stretch of path, and we go and pick up all the trash every couple months. 🚮 Ding your bell if you see us out there! 🛎
We got a package in the mail from @alternativebike We got a package in the mail from @alternativebikeco the other day with these blasts from our past in the box. Back when Moon Units were smaller and had a more finicky pinch bolt, back when people bought brake lever extensions so you could use your brakes from your bar-ends, and back when instructions were rudimentary drawings and said things like: “Hey- Be cool to the ground.” Thanks for the trip down memory lane!
Mike P won the #SierraOddity, what a lucky devil! Mike P won the #SierraOddity, what a lucky devil! Thank you so much to everyone who contributed parts and labor to this project, and an even bigger thanks to everyone like Mike who were willing to chip in and support @camtborg and all the work THEY put into trail advocacy. Good feelings all around! Now then…what kind of bike should we build @sierranevada next year?…🤔
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  • 11204 Midway
  • Chico, CA 95928
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