Sprocket teeth burring.

Discussion in 'Bicycle Mechanics and Repairs' started by Paul Walters, 12 Apr 2010.

  1. Sprockets on my shimano equipped touring bike are showing burs on the pressure faces of the teeth. I am also getting chain slippage from ring to ring when honking.

    Can the burring cause the chain to slip off the teeth, or is there another cause I haven't thought of ?

    Just thought I'd check before I go to the expense of getting a new cassette tool and cassette.

    The cassette has probably only done 2000 miles in 2 years.

  2. RecordAceFromNew

    RecordAceFromNew Swinging Member

    West London
    The late, great Sheldon Brown has probably the best illustration on chain and sprocket wear and you might find it useful. If the chain is worn, using it on a new cassette will wear the cassette out quickly.
  3. Hmmm, read that. Doesn't quite hit the spot.

    The chain is new (less than 500 miles), but I did snap the previous one on a LEJOG in 08. Perhaps the damage to the teeth stems from that time. (Pulling onto Rannoch Moor with a fully laden bike).
  4. zacklaws

    zacklaws Veteran

    How much mileage was the previous chain before it snapped as that is when the damage may have happened to your sprokets. If that chain was well worn then it will have worn your sprokets out and possibly your chain rings.

    This jumping usually happens when you fit a new chain on worn sprockets / chain wheel as the teeth no longer fit the chain.

    My road bike last year needed a new cassette and chain rings due to the chain wearing them out in about 2000 miles, now I have a chain checker and replace it at the first indication of wear and having done about 3000+ miles and 3 new chains this year, both cassette and chain rings look as good as new
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