Shimming Eccentric Bottom Brackets

Recently, I put together a 17" 2006 Zion 660EBB Singlespeed frame.

It has an eccentric bottom bracket with dual locking set screws.

Shiming the Eccentric

I will fill the gap using some stainess steel shim stock. It is best to use a single shim so that it is as thick as it can be for durability sake. I prefer stainless shims over brass for the same reason.

A 0.010" shim and a 0.0015" shim. In the end, just the 0.010" shim was used and it was a very snug fit.

The greased shim with a bend to help installation

Hardware Replacement

The two round head cap screws were replaced with Stainless Steel Cap screws for use with a larger wrench and matirial to grab in a worst-case situation. Now a 5mm allen wrench can be used.

Greasing and Installing

Marine Grease. Use marine grease. Its what I use when reaming bottoms.

Test fitting.

I also need to find a way to rust proof the edges.

Park SPA-2 tool is used to roll the cam.

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