Spokes rubbing when on largest rear cog

mosler
mosler Posts: 3
in Workshop
Hi, I had a low speed fall on my Giant Defy, ever since then when I use the largest rear cog, it rubs on some of the spokes making a noise. I've tried adjusting the spokes but with no success, is there anything else I could try adjusting, like the rear derailleur?

Thanks

Comments

  • Wheelspinner
    Wheelspinner Posts: 6,712
    Derailleur hanger is likely bent, will cause this. They are meant to do so in just this scenario as cheaper to fix than a derailleur, or bent/broken frame.

    Two options: may be possible to straighten it - there are specific tools to do this, and your LBS will have one - which ensure the alignment is set correctly; or if too far out it might be a replaceable part from Giant.

    Find it here for example:

    https://giantbikespares.com/hanger_finder
    Open One+ BMC TE29 Seven 622SL On One Scandal Cervelo RS
  • joe_totale-2
    joe_totale-2 Posts: 1,333
    Wheelspinner is correct, I've had this happen me in the past and it was a bent derailleur hanger. I was able to bend to back but be careful if you try that.

  • whyamihere
    whyamihere Posts: 7,717
    As mentioned, it's almost certainly a bent hanger. What did you do to the spokes though? You may have compromised the wheel depending on what you did and whether you put it back as it was or not.
  • fenix
    fenix Posts: 5,437
    I've just bent the cage back in the past. If you break anything it's not my fault though.
  • cruff
    cruff Posts: 1,518
    You're not likely to break the derailleur if you try to bend the rear mech back (it's what the hanger is for after all) but:

    a - you'll never get the bike to shift smoothly again unless you somehow manage to bend it back to perfectly straight,
    b - the act of bending it back will weaken it further, leading inevitably to a catastrophic failure when you are at the absolute apex point of your next ride,
    c - if it breaks while you're shifting you could end up with it going right into the wheel... Which is NOT a pleasant occurrence, and
    d - they cost about 15 quid to replace

    Just buy a new one.
    Fat chopper. Some racing. Some testing. Some crashing.
    Specialising in Git Daaahns and Cafs. Norvern Munkey/Transplanted Laaandoner.
  • pilot_pete
    pilot_pete Posts: 2,120
    whyamihere said:

    As mentioned, it's almost certainly a bent hanger. What did you do to the spokes though? You may have compromised the wheel depending on what you did and whether you put it back as it was or not.

    Yes, interested to hear what you have done to the spokes. It sounds like it is is job beyond your capabilities (no disrespect), so either find out how to do it properly before tackling it, get the right tools to do the job, or just take it to someone who knows what they are doing. Unfortunately it does sound like you are creating more problems than you are solving if you are adjusting spokes...

    PP

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