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Chain Slipping - Crankset

Discussion in 'Bicycle Mechanics and Repairs' started by dhd.evans, 6 Jan 2017.

  1. dhd.evans

    dhd.evans Über Member

    Since buying my new shiny B'twin Ultra 700 back in September I've been using it almost daily.

    My chain is slipping on my big ring (hah) and not catching. I suspect it's down to general wear-and-tear. In fact, looking at my bike stats on Strava i've put 645mi through it so... maybe that's it? I replaced my chain with another 105 model after the winter break and that's catching the rear cassette no bother, slips up and down with ease.

    I've ordered up a new 50t ring to be safe but would welcome any other diagnosticians weighing in on what might be the issue and if there are any interim measures i can take to make it work that little bit better.
  2. S-Express

    S-Express Guest

    645 miles is not very much to be honest - much less than a month's riding for some. Either way, the chain should not be worn over that kind of distance, assuming you have looked after it reasonably. Might be useful to put up a photo of the chain/chainset for closer examination.
  3. OP

    dhd.evans Über Member

    Chain was goosed; picked up too much grime and salt from the roads, even with adequate lubrication it dried out and rusted. Was just easier to replace it. Will get a pic up shortly.
  4. ColinJ

    ColinJ Hillfinder General

    Chains do take a battering once the roads are gritted, especially if you do not have mudguards on your bike.

    I think it is worth making an effort to clean your chain after mucky rides. If not, then you will be getting through chains, cassettes and chainrings more quickly than you need to.
  5. Chains can take a battering at this time of year.
  6. S-Express

    S-Express Guest

    Apparently not.
  7. ColinJ

    ColinJ Hillfinder General

    There is a 51 minute echo in this thread! :laugh:
  8. raleighnut

    raleighnut Guru

    On 3 Wheels
    Is it slipping under load (worn cog) or not engaging with the chain when you shift up (cable tension on front mech)
    gbb likes this.
  9. OP

    dhd.evans Über Member

    The latter! I wonder if that's the issue...
  10. Eddy

    Eddy Guru

    Stick a pic of your big ring up, side on view of the teeth .
  11. midlife

    midlife Veteran

    Chain rings can get very worn and still function ok. BITD I used to see the teeth worn down to tiny little shark fins lol

  12. Give the cables a good clean and lube, if crud builds up where the inners meet the outers, this can cause issues like this.
  13. ianrauk

    ianrauk Tattooed Beat Messiah Staff Member

    Barmy in Barming
    645 miles and you think you need a crank ring? Nah, not in that short mileage. There's some other reason.
    raleighnut likes this.
  14. gbb

    gbb Legendary Member

    I'd go with cable tension as well. The bikes quite new, has it had its 'service' dhd ? That's when you'd hope they tweek the cables because they usually stretch when new. Loss of tension will give the FD less pull upwards, so failing to engage the big ring properly.
    dhd.evans and raleighnut like this.
  15. Depends upon the quality of the chain and what they've been riding on/through. I had a recent case on a Dr Bike session for a brand new bike, which didn't have mudguards, which had done about 200 miles total. The chain, being about 6 weeks old, had never been cleaned but was more than 1% stretched and slipping like mad. The rider had however been going daily on the infamous Luton-Dunstable Busway with its surface of crushed limestone - see example below.

    When it's wet, the dust is like grinding paste.