Birzman Chain Keeper (New)

A Chain Keeper (dummy hub) compatible with both QR and 12 mm thru-axle dropouts without switching of parts or adapters.

Featuring a free-spinning and side-shifting pulley wheel, allowing shifting of the derailleur and a high polymer spacer providing abrasion protection against dropout surfaces, this is a quick and easy tool to have on hand for routine cleaning and maintenance work.

Key Features

• Compatible with both QR and 12 mm thru-axle dropouts

• Functions as a dummy hub for drivetrain maintenance

• Free-spinning pulley wheel allows derailleur shifting

• Side-shifting pulley improves chain alignment

• High polymer spacer protects dropout surfaces

• Enables easy cleaning, lubrication, and adjustment

• No need for additional adapters or part changes

• Compact and efficient maintenance tool

Product Specifications

• Brand: Value: Birzman

• Product Type: Value: Chain keeper dummy hub

• Compatibility: Value: QR and 12 mm thru-axle dropouts

• Mechanism: Value: Free-spinning pulley wheel

• Protection Feature: Value: High polymer spacer

• Usage Type: Value: Drivetrain cleaning and maintenance

• Function: Value: Maintains chain tension without rear wheel

• Application: Value: Bicycle servicing and repair

Drivetrain Maintenance Efficiency

The Birzman Chain Keeper is engineered to make routine bike maintenance more efficient and controlled. The free-spinning pulley wheel helps maintain proper chain alignment, allowing accurate gear shifting even when the rear wheel is removed. The high polymer spacer prevents damage to dropout surfaces, ensuring safe and smooth operation during repeated maintenance sessions.

Easy Operation / Usage

• Remove rear wheel from bicycle frame

• Install chain keeper into QR or thru-axle dropout

• Position chain onto pulley wheel

• Shift gears smoothly for cleaning or adjustment

• Remove tool easily after maintenance

Why Choose This Product

• Simplifies drivetrain cleaning and tuning tasks

• Compatible with multiple axle standards

• Maintains proper chain alignment during servicing

• Protects frame surfaces from abrasion

• Easy installation without additional tools

• Reliable Birzman engineering and durability

In the Box

• Birzman Chain Keeper