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So I found a magic gear ratio on my 2002 Gary Fisher Supercaliber, it is 30x19, which is too small for my liking. My question is if I bring the front ring to 31 and drop the rear to 18 I won't have to change my chain length, right? Sorry if seems like a dumb question but any help is appreciated!
 

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For very small adjustments you can file the dropouts and/or axle.

Adding and deducting teeth to chainrings and cogs has a different effect because the relative change in diameter and amount of chain wrap varies. It's fairly complex but thankfully there are calculators to make toying with numbers easier.
 
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