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PostPosted: Mon Sep 17, 2012 4:12 pm 
retrobike rider
retrobike rider
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Joined: Mon Mar 29, 2010 10:38 am
Posts: 348
Location: Conwy
I'm slowly collecting parts for a replacement drive train and am now in the process of trying to source chainrings and need help deciding on ring size.

I'm using a Shimano Crane rear dérailleur which has a total capacity of 28 teeth, rear cassette will be a six speed 28/13 and I'd like chainrings of 52 and 38.

From my understanding my total capacity would work out as per the following- (52 + 28 ) - (38 + 13) = 80-51= 29.

Is my calculation correct and would there be a problem asking the rear mech to cope with a total capacity of 29 instead of the specified 28?


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PostPosted: Mon Sep 17, 2012 5:02 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8220
Location: New Forest, UK
I would try it. Shimano usually gave conservative guidelines to guarantee trouble-free operation. Provided you don't have a bike with very short chainstays you will probably get away with it.


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PostPosted: Mon Sep 17, 2012 6:53 pm 
retrobike rider
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Joined: Mon Mar 29, 2010 10:38 am
Posts: 348
Location: Conwy
Thanks for that Hamster, I'll risk it and give it a go.


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