Bike Forums - View Single Post - Chain is too long, why make it shorter?

09-21-22 | 04:45 PM

#27

FBinNY

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Joined: Apr 2009

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From: New Rochelle, NY

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Quote:

Originally Posted by alexk_il

Thanks. I don't have the backpedaling shifting on my other bike. Hmm....

Is it because of the different profile of the sprockets or because of a different derailleurs? Maybe both?

As I said earlier the RD cannot affect what's happening on the top of the cassette.

Imagine trying to watch the front door of a building while standing by the back door.

Since it's uncontrolled by the derailleur itself Auto shifting when back pedaling is purely a function of chain line and the specific profiles of both the sprocket teeth and chain links.

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