New Mountain Bike Chain Wheel Problem ?

I recently replaced my original pedal chain wheel with one from another mountain bike. The new one works fine with speed & strenght. However when I change gear using the handlebar selector the chain won't jump to the selected gear
but positions itself between two tooth sets on the rear tire
or it jumps almost of the entire chain.
This is probably because the original number of teeth on the pedal wheel are 48-38-28 and on the new one has 46-36-26.
how can I adjust this or can't I ?
i would appreciate some kind help.

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2 Comments »

  • Ride!Urb said:

    I’ve switched cranks on a few bikes to ones with different tooth configurations and it’s never affected the rear shifting….no reason for it to unless your chain was too long to begin with and you need to remove a link or two (or set it up properly to begin with). Check out the http://www.parktools.com site and click on “repair help”…..good instructions on properly sizing a chain to length, and most other tasks including setting up and adjusting your derailleurs, cable tension, etc.
    I’m not sure I completely understood your question, but if you’re having trouble shifting on the front (the new crankset), you just need to set up your front derailleur again. This is pretty common. Even with some manufacturing standards in place, small differences in the way a crank is made can make it necessary to readjust the front derailleur. The rear shouldn’t be affected at all, though.
    Hope this helps…..post again if you need more info! :o )

    # 2 February 2010 at 2:00 am
  • flexible said:

    You probably need to tighten your shifter cable. It’s possible with the smaller gears that you might also need to slide the front derailleur down the seat tube, just a little bit, so that it is closer to the chainwheel.

    # 2 February 2010 at 6:09 am

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