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I've got a Scott tt bike with dura ace kit. I was looking at the chainring and it seems that some of the teeth have lost the tops of the teeth but looking at chain reaction
(http://www.chainreactioncycles.com/Models.aspx?ModelID=38161) seems to the design anyone know why this is?

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dave atkinson [6307 posts] 6 years ago
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It's to help the chain ramp up at the shifting points where the power transfer from the rider is most likely to stop it doing so.