Bike Forums - View Single Post - Chainring tooth profiling question

04-26-14 | 12:44 AM

#21

twocicle

Clipless in Coeur d'Alene

Joined: Mar 2012

Posts: 1,996

Likes: 22

From: Coeur d'Alene, Idaho

Bikes: Tandems: Calfee Dragonfly S&S, Ventana ECDM mtb; Singles: Specialized Tarmac SL4 S-Works, Specialized Stumpjumper Pro, etal.

Eureka! Chainring Choice or Shifting Ramps? | Off The Beaten Path

Exactly the issues I was describing and how they addressed the problem (though a bit vague).

Plus, because my setup has a slightly wider spacing between the granny & big ring (so the chain clears the 130bcd chainring bolts) I believe that exacerbates the issue by causing even more diagonal skew than in the "bad shift" pictured below.

I'll need to dig deeper into how they profiled their teeth to solve the issue...

The issue I am seeing is this (image from link above):

Last edited by twocicle; 04-26-14 at 12:51 AM.

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