[Yak] Capreo versus standard 9 speed cassette
geoffreygee at yahoo.com
Sat Dec 5 12:43:37 CST 2009
=-=-=-=-= John Allen wrote =-=-=-=-=-=
A crankset with a 110 mm bolt circle will allow chainrings down to 34 teeth, and so with a 32 or 34-tooth cog on the back, you are getting a low gear around 20 inches. 53 and 54-tooth chainrings with this bolt circle are made, see http://sheldonbrown.com/harris/chainrings/110.html
That is right. I suggested the compact crank since ...
(1) high quality 50/34 ramped and pinned chainrings and the appropriate front derailers are readily available which is noticeably helpful with STI.
(2) the bike is for touring, a low 20" gear is a real perk if heavily loaded.
(3) the referenced triple was a 50/39/30 so the same top end would be available ... 105 or so gear inches
Of course, if 34t chainring isn't low enough with your 110 BCD double, you can shell out $50 for a 33t chainring ...
There is at least one recumbent that takes this strategy ...
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