What is an Eccentric Bottom Bracket?

What is an Eccentric Bottom Bracket - Bicycle Parts Direct

Eccentric Bottom Bracket

An eccentric bottom bracket is actually an adapter that converts your PF30 or BB30 bottom bracket and allows users to adjust the fore-to-aft position of the crankset to add tension to their chain. This is done by rotating the off-center (or eccentric) axle position within the round frame shell to move it forward and pull the chain taut. This type of mechanism has been commonly used by singlespeed riders.

Single Speed Bikes

With the Wheels Manufacturing Eccentric bottom bracket you can convert your PF30 or BB30 road or mountain bike into a single speed. The eccentric bottom bracket you can increase or decrease chain tension with ease.

 

Eccentric BB30

Convert your BB30 frame to a single-speed setup with a Wheels Manufacturing eccentric bottom bracket. Enduro Angular Contact sealed bearings.

 

Eccentric PF30

Convert your PF30 frame to a single-speed setup with a Wheels Manufacturing eccentric bottom bracket. Enduro Angular Contact sealed bearings.

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