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Old 07-12-05, 10:59 PM   #1
Cyclingmaniac
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Cassettes? Gears? Numbers? Help!!!!

I'm number challenged! What do they mean? I have a 12-25 (cassette?) on the back and 39-53 (gear?) on the front. Do these numbers refer to the teeth? As an example: The back cassette(?) has a small ring with 12 teeth and the largest has 25 teeth? The front gear/chainring(?) has 39 teeth for the smaller ring and 53 teeth for the larger?

Help me Mr. Wizzzzzzaaarrrrd!
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Old 07-12-05, 11:33 PM   #2
phidauex
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Yup, you've got it maniac.

Any other questions you need to answer for yourself?

peace,
sam
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Old 07-13-05, 12:33 AM   #3
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Yep, got it...

The larger the front ring the faster your rear wheels turns, the smaller the rear gear the faster the rear wheel turns.

I.e. 39-25 (39 teeth front and 25 teeth rear) is the smallest gear, 53-12 would be your highest gear.
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Old 07-13-05, 06:48 AM   #4
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So what's your question? power/speed/ease of riding?

Gears up front are called chainrings or chainring sets for a double or triple.

Gears in back are called cassettes or cogs. It used to be you would make your own sets of gears in the rear and pick a series of cogs and mount them on a cassette like assembly. Each circle of metal here is called a cog. Now you just change one of the sets which you need new gears in the rear.
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Old 07-13-05, 07:10 AM   #5
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A 12-25 cogset is pretty much standard; a good average. Touring or climbing cassettes may go up to 32 teeth, the normal limit for most rear derailleurs. Strong riders and racers may prefer a cogset that goes down to 11, with a 53-tooth "big ring".
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