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Old 06-22-09, 05:12 PM
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operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
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Bikes: 1987 Bianchi Campione

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The point of the EBB is so that that you can tension the chain to prevent exactly what it is you experienced. The fact that it occurred means your EBB was never properly adjusted to provide proper chain tension or it lost it's adjustment due to significant chain wear.

The chain should never come off to begin with. If you want to prevent this from happening, install an inner jump stop. The regular cadenza with a dual chainring up front (NOT your model) is even worse in this regard.

This is a user maintenance failure, not a design failure.
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