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  1. #1
    Senior Member Riverside_Guy's Avatar
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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...
    1991 Trek 750 Multitrack Hybrid

  2. #2
    DRF aka Thrifty Bill wrk101's Avatar
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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.

  3. #3
    Bianchi Goddess Bianchigirll's Avatar
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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!
    Bianchis '87 Sport SX, '90 Proto (2), '91 Boarala 'cross, '93 Project 3, '88 Trofeo, '86 Volpe, '89 Axis, '79 Mixte, '99 Mega Pro XL Ti, '97 Ti Megatube, , '90 something Vento 603,

    Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '86 Bertoni (sold), '09 Motobecane SS, '98 Hetchins M.O., '09 K2 Mainframe, '89 Trek 2000, '?? Jane Doe (still on the drawing board), '90ish Haro Escape

  4. #4
    Senior Member Chombi's Avatar
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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.

    Chombi
    84 Peugeot PSV

  5. #5
    Senior Member Riverside_Guy's Avatar
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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...
    1991 Trek 750 Multitrack Hybrid

  6. #6
    DRF aka Thrifty Bill wrk101's Avatar
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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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