Eccentric Bottom Bracket Modification

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Problem

I know a few people around the country that are sponsored by Gary Fisher to ride 29" Rig Singlespeeds for the 2007 season.

The biggest complaint that they all have is the weight of the stock EBB cam. I figured that I would make a tool to trim some fat off the EBBs for these racers. Every gram counts.

Generic EBB Weigh In

This EBB cam is from a Zion Single. It's pretty generic and will serve as a good test peice untill I get the actual units in hand.

189 Grams.

Light-EBB-8.jpg

Making the Arbor

Light-EBB-1.jpg

Light-EBB-2.jpg

Light-EBB-3.jpg

Light-EBB-4.jpg

Machining the EBB

Light-EBB-5.jpg

Light-EBB-6.jpg

Final Weight

135 grams.

I could probably pull off another 10 grams, but I've done enough for now.
Light-EBB-7.jpg

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