Thread: Improving efficiency for a converted mountain bike commuter
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Old 01-28-12 | 08:09 PM
  #25  
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Bill Kapaun
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From: Mid Willamette Valley, Orygun

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds. 2019 Giant Explore E+3

I'm assuming your largest ring is a 42T and your largest cog is a 14T?
I'm also assuming your bike has a Freewheel?

That only gives you a gear ratio of 3 to 1, which is about 75 gear inches.
There are 13 tooth FW's available, which would gear you up about 7%, or 81 gear inches.

IF your bike actually has a Free Hub, you have a lot more choices in cassettes, down to 11T top cogs.
http://sheldonbrown.com/free-k7.html
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