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  1. #1
    Code Warrior mwrobe1's Avatar
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    Chainring question

    OK...don't laugh at my DS MTB...I'm going to upgrade to a better ride when funds become available; but question...based on the below pic:



    Do I assume correctly that if I ever have the need to replace the largest chainring that I am SOL? I'd like to keep this bike around as a "beater" in the future/and or something my wife can tool around with when she gets the motivation. I'm always in the largest cog in front and in the smallest three cogs in the rear.

    If I would be SOL...what could I plan on spending to upgrade the spider/chainrings to something more "standard" (i.e. something that will take 4 or 5 bolt chainrings? I know, I know...don't tell me its not worth doing...but I'm a sentimental guy OK...)

    I'm probably asking this question incorrectly...pardon the noobness.
    Last edited by mwrobe1; 09-18-06 at 10:21 AM.
    Elwood: It's 106 miles to Chicago, we got a full tank of gas, 1/2 a pack of cigarettes, it's dark and we're wearing sunglasses.

    Jake: Hit it.



  2. #2
    Senior Member
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    Save your money for a new bike. If your wife is interested in riding get her a bike as good as yours.

    Al

  3. #3
    ot.net slave
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    I'm pretty sure you can't replace the chainrings on those things. Pretty common OEM design. Do a quick ebay search and you should come up with heaps of lightly used or take-off 4-bolt cranksets with replaceable rings which would be suitable replacements. Shimano alivio and deore are good value.

    - Joel

  4. #4
    Code Warrior mwrobe1's Avatar
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    Quote Originally Posted by tomacropod
    I'm pretty sure you can't replace the chainrings on those things. Pretty common OEM design. Do a quick ebay search and you should come up with heaps of lightly used or take-off 4-bolt cranksets with replaceable rings which would be suitable replacements. Shimano alivio and deore are good value.
    I'll count'em when I get home...but I'm pretty sure thats a 44/30 something/20 something...another stupid question...if I was to go 46/30 something/20 something I'd need I longer chain right?

    Also, I could be %99 certain that the crank is a square spindle type right?
    Elwood: It's 106 miles to Chicago, we got a full tank of gas, 1/2 a pack of cigarettes, it's dark and we're wearing sunglasses.

    Jake: Hit it.



  5. #5
    ot.net slave
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    yes it's a JIS (standard japanese type) square taper BB spindle. The big ring is probably a 44, then 32/34 and 22/24. If you were to go to a 46t big ring you may not need a longer chain. It depends on whether your current chain was cut a half link long or a half link short.

    an increase of 2 teeth on the chainring means an increase of a half-link (one tooth) of slack taken up at any given time (as the chain only contacts about half the chainring at once) which is a half inch.

    - Joel

  6. #6
    Code Warrior mwrobe1's Avatar
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    Quote Originally Posted by tomacropod
    yes it's a JIS (standard japanese type) square taper BB spindle. The big ring is probably a 44, then 32/34 and 22/24. If you were to go to a 46t big ring you may not need a longer chain. It depends on whether your current chain was cut a half link long or a half link short.

    an increase of 2 teeth on the chainring means an increase of a half-link (one tooth) of slack taken up at any given time (as the chain only contacts about half the chainring at once) which is a half inch.

    - Joel

    Thank you for your response!
    Elwood: It's 106 miles to Chicago, we got a full tank of gas, 1/2 a pack of cigarettes, it's dark and we're wearing sunglasses.

    Jake: Hit it.



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