Rear Cassette "Whirring"

Mike39496
Mike39496 Posts: 414
edited March 2012 in Workshop
I recently took my bike in for a service and the chain had to be replaced due to wear. The guy who replaced it said that the chain seemed to sit okay on the rear cassette and it didn't appear to be worn.

I took it out for the first time today and when I drop it down to the smaller cogs it seems to whirr constantly (it doesn't in the larger ones and this is in the larger front chainring).

Basically i'm wondering if the cassette will need replacing too?

Cheers.

Comments

  • ddraver
    ddraver Posts: 26,810
    Bearings in the freehub? or is it rattling on the front derailler?

    Doesnt sound like anything to me to be honest
    We're in danger of confusing passion with incompetence
    - @ddraver
  • wishitwasallflat
    wishitwasallflat Posts: 2,927
    AFAIK the classic indication of an excessivley worn cassette after fitting a new chain is the cahin skipping and jumping. Can you refit the old chain to see if it goes away - or did the lbs chuck it?#

    Also have you checked the cable tension is correct - I am wondering if the whirring is the chain not quite sitting correctly on the smaller cogs (although people I think usually describe that noise as chattering - I think).
  • centimani
    centimani Posts: 467
    Don't worry too much, I had exactly the same after fitting the second chain on my cassette. It gave a whirring noise for maybe 2 weeks then settled down, no problems since. I assume it's just the chain meshing in.
  • Mike39496
    Mike39496 Posts: 414
    Alright cheers for the replies seems it was nothing to worry about, just wanted to make sure my chain wouldn't get wrecked because of the cassette.

    Thanks again.
  • ddraver
    ddraver Posts: 26,810
    Get a chain checker and keep an eye on chain. If you change them at the rich moment (usually about 0.75% worn) then you can preserve the life of the cassette. If you let them go too far then you ll need to change the cassette too, if you ride them into the ground then you ll need to do the chain rings as well.

    Get a maintainence book and learn to do it yourself too, it's good to know these things so you have some idea of how to bodge something back together if you break something on the road and usually buying the tool costs the same as paying the LBS to do it so the next time it will be free :)
    We're in danger of confusing passion with incompetence
    - @ddraver

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