Old 12-26-16, 10:36 AM
  #3  
SkyDog75
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Join Date: May 2011
Location: Upstate NY
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Bikes: Bianchi San Mateo and a few others

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You can plug your cog & chainring sizes into an online gear calculator to figure out exactly what a change in gearing will do for you. There are a few popular ones out there. The one on Sheldon Brown's site isn't the prettiest, but it'll do what you're looking for and then some:

Sheldon Brown's Bicycle Gear Calculator
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