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  1. #1
    Senior Member
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    A 48-tooth replacement for a "Shimano FCM341-L w/ Replaceable Rings, 22/32/42t"?

    Does a 48 tooth replacement exist for the Shimano FCM341-L w/ Replaceable Rings, 22/32/42t that came with my bicycle? The bicycle's tech page can be found at http://www.diamondback.com/bikes/mtn...l/response-08/.

    I was originally hoping to just replace the top-ring but the LBS said that would result in significant performance differences due to the whole crank-set being "specially designed" or whatnot. So, I'm starting to think replacing the whole crankset would be the best route but is it possible? If so, would a Shimano Ultrega 48 tooth crankset work fine? I'm not sure how compatible my particular bicycle is with other components but I'd like a 48 tooth front for maintaining 30 mph without pedaling as if I were a madman(30 mph on the flat).

  2. #2
    Senior Member
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    Road cranksets have a different chainline measurement...45mm instead of 50mm? 46t 104mm chainrings are available...I had one on my bike for a while, shifting was a bit weird, but it worked okay.

  3. #3
    use your best eye kenhill3's Avatar
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    swbluto-

    Make sure you post over at the mechanics forum, too. Lots of knowledgeable folks there also.
    "I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.

  4. #4
    Mad bike riding scientist cyccommute's Avatar
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    BikeMan (this isn't the only one) has them. They are used on lots of touring bikes as 'Trekking' rings. You'll probably want to swap the middle ring too. A 48 to 32 is a big jump. You might want to calculate the gear inches for a 42/11, 44/11, 46/11 and 48/11. 48/11 is a pretty tall gear and is larger in diameter than most mountain bikes use.
    Stuart Black
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