Bike Forums - View Single Post - Best road cassette ratios for mostly just flat terrain?

07-16-13 | 06:51 AM

#22

merlinextraligh

pan y agua

Joined: Aug 2005

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From: Jacksonville

Bikes: Willier Zero 7; Merlin Extralight; Calfee Dragonfly tandem, Calfee Adventure tandem; Cervelo P2; Motebecane Ti Fly 29er; Motebecanne Phantom Cross; Schwinn Paramount Track bike

Quote:

Originally Posted by dudemanppl

12-21, only choice.

I have an 11-21 on my disc wheel for TT's.

For just riding around, I prefer an 11-23.

The reason being is that you can stay in the big ring more with the 11-23. With the 11-21, unless you want to completely cross chain, your lowest gear in the big ring is 53/19. With the 11-23, that becomes 53/21.

Those two teeth may be the difference between staying in the big ring into a strong headwind, or up a bridge,and shifting to the small ring.

Conversely, all you're giving up is the 18 tooth cog on the 11-21, which isn't a big deal ( and if you need the precise ratio of the 18, it's virtually duplicated by 39/13 on the 11-23)

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