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  1. #1
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    new chain, questions

    Somehow my first chain on my 2005 raleigh m80 had worn out, and I replaced it. I am also planning on replacing the cassette which shows slight wear as well.

    I replaced the original sram pc-48 chain with a sram pc-951 chain. The shifting has suffered greatly just on the stand (i wont ride it til i get a new cassette). The rear derailleur was set up perfectly. Now, the chain is reluctant to shift up into larger cogs but will, but is very very slow and sometimes won't shift down into smaller cogs. the derailleur is moving, but the chain doesn't. I tried adjusting it to no avail (I usually have no problems adjusting derailleurs).

    Are my shifting woes because of a worn cassette with a new chain, or is my chain possibly incompatable? I am running a truvative blaze crank with an LX derailleur.

    Thanks in advance
    Last edited by fadetoblack6902; 06-05-07 at 09:30 PM.

  2. #2
    Senior Member Nycycle's Avatar
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    I beg your forgiveness but without having it in hand I can't be much help.
    I do got to ask though, how many miles you got on this bike?
    I hate cars,

  3. #3
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    Quote Originally Posted by Nycycle
    I beg your forgiveness but without having it in hand I can't be much help.
    I do got to ask though, how many miles you got on this bike?
    I have probably less than 1000 miles on it, and the bike has been taken care of. I am not sure why it's worn out so quick.

  4. #4
    Senior Member George's Avatar
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    It sounds like you have to adjust your cable tension.
    George

  5. #5
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by fadetoblack6902
    Somehow my first chain on my 2005 raleigh m80 had worn out, and I replaced it. I am also planning on replacing the cassette which shows slight wear as well.

    I replaced the original sram pc-48 chain with a sram pc-951 chain. The shifting has suffered greatly just on the stand (i wont ride it til i get a new cassette). The rear derailleur was set up perfectly. Now, the chain is reluctant to shift up into larger cogs but will, but is very very slow and sometimes won't shift down into smaller cogs. the derailleur is moving, but the chain doesn't. I tried adjusting it to no avail (I usually have no problems adjusting derailleurs).

    Are my shifting woes because of a worn cassette with a new chain, or is my chain possibly incompatable? I am running a truvative blaze crank with an LX derailleur.

    Thanks in advance
    Does the bike have a 9 speed or 8 speed cassette? A PC-48 is an 8 speed chain while the PC-951 is a narrower 9 speed chain. If you have an 8 speed cassette, the narrow chain may not mate to the cogs as well.

    Replacing the cassette should help. You may want to lube the cable also. You can do that - without taking the cables off - by shifting to a lower gear and then, while not pedaling, shift to a higher gear. You'll have enough slack in the cables to slide the housing out of the stop and you can smear grease on the inner cable then.
    Stuart Black
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  6. #6
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    sorry I was wrong it actually had a pc-49 chain. I looked at the bike's spec sheet and it was supposed to come with a pc-950. It is a 9 speed sram pg-950 cog.

    I did think of lubing the cables and will do that.

  7. #7
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    I just lubed the cables, and no change. I tend to keep the cables lubed and gunk free. I'm thinking it's the cassette.

  8. #8
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    No way could you wear out a cassette in 1000 miles. Everyone's mileage is different. I get 5000 to 7000 miles out of a chain and have never worn out a cassette.

  9. #9
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    Quote Originally Posted by Al1943
    No way could you wear out a cassette in 1000 miles. Everyone's mileage is different. I get 5000 to 7000 miles out of a chain and have never worn out a cassette.
    thats what I was thinking, but the smaller cogs are starting to get shark toothed. It's not super bad, but definately worn. The reason I changed the chain in the first place is it was skipping off the gears while in the small/middle combo. Replaced the slightly bent chainring, fine tweaked the derailleurs, ect. I replaced the chain and the skipping is gone (though i haven't ridden it yet, just on the stand).

  10. #10
    back in the saddle bent-not-broken's Avatar
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    Check the old chain for "stretch". This should give an indication of how bad it was worn and how bad the cassette will have worn. If you see shark tooth wear that may be your problem.
    Bent

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