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Gearing Question(3 posts)

Gearing Questionschills
Dec 3, 2001 4:40 PM
I don't know much about gear ratios other than bigger on the back is easier, bigger on the front is harder. I currently ride 12/25 and 53/39. My question is as follows. If I switch my 53 chainring to a 54 is that the same as taking away one tooth from every cog in the back?

I'm focused more on time trialing now and know that I can put an 11/23 cassette on, but wondered why some opt for a bigger chainring up front. . . or is it that they do both? I don't often spin out in the 12, but I find myself riding in the 3 smallest cogs most of the time in an event. I'm not necessarily intending to switch anything, but I just started thinking about this and really wanted to understand it all better.

Thanks in advance for any knowledge you elect to share.
re: Gearing QuestionNRG Climber
Dec 3, 2001 5:05 PM
Here is a great site on gearing.
http://www.sheldonbrown.com/gain.html
re: Gearing QuestionDAC
Dec 3, 2001 5:34 PM
On the big ring, 1 tooth on the cog is worth about 4 teeth on the ring. A difference of 1 tooth on the ring will give you about a 2% rise, whereas 1 tooth on the cogs will give you about 8% rise.