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Old 08-21-09, 10:14 AM   #1
Riverside_Guy
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91 Trek 750 Gears?

Correct me if I'm wrong, but isn't it the number of teeth per chainring both front and rear that tell the overall gearing of a bike?

That being said, is there some place that has such data for older bikes.. like my 91 750? Or do I take a long while and manually count all 10 I have on my bike...
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Old 08-21-09, 01:26 PM   #2
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Just go to the vintage Trek site and look at the brochure for your year. They have a spec page that shows all the models. Then go the Sheldon Brown site, he has a gearing calculator.
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Old 08-21-09, 04:50 PM   #3
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I was never big into gear inches (which may be a problem since I am building a IGH) just rember the bigger the ring in the front the faster you go the bigger the cog in the back the slower you!
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Old 08-21-09, 06:07 PM   #4
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Never did figure out gearing formulas all these years. Gear inches is still a mystery to me. All I know is you do not want too many duplicate ratios from your big ring to you small ring. I was suspicious about my upgearing my big one from 52 to 53 with a 42 smaller ring and a 13/21 cob, but according to my LBS classic bike expert, I should be generally OK, except for maybe two ratios that is a bit close to each other.

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Old 08-22-09, 10:15 AM   #5
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Couldn't remember exactly when I bought the bike, but that vintage site says I probably have a 91... based on frame colors. Except, it says "91, black with white decals on yellow and silver" and there's almost no yellow, but a lot of blue for the drop shadows. 91 sounds just about correct and the years around it colors are way, way off.

The brochure says 48/38/28 for my front chainrings, but doesn't list anything for the rear cogs. Shouldn't one also have to know those specifics to be able to have a list of overall gearing? Or can one simply use the front 3...
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Old 08-22-09, 01:38 PM   #6
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Quote:
Originally Posted by Riverside_Guy View Post
Couldn't remember exactly when I bought the bike, but that vintage site says I probably have a 91... based on frame colors. Except, it says "91, black with white decals on yellow and silver" and there's almost no yellow, but a lot of blue for the drop shadows. 91 sounds just about correct and the years around it colors are way, way off.

The brochure says 48/38/28 for my front chainrings, but doesn't list anything for the rear cogs. Shouldn't one also have to know those specifics to be able to have a list of overall gearing? Or can one simply use the front 3...
The brochure says 7 speed 13/30 for the rear. Thats the size of the smallest and largest cog. Don't worry about the intermediate sizes, or if you want, count the teeth.

Last edited by wrk101; 08-22-09 at 03:25 PM.
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