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  • Crank Irregularity in smoothness

     chrisfrench updated 11 years, 7 months ago 4 Members · 10 Posts
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  • chrisfrench

    Member
    2 June 2009 at 8:04 pm

    I have a slight irregularity when pedalling my bike, its been in for a service at Evans today, but they have not fixed it.

    Not really much idea what is causing it, it feels like its coming from the crank, and when I pedal there is a marked clunk in the smoothness of the rotation.

    The bike did not do it when new and its only covered about 80 miles in the 3 months I have owned it.

    Anyone got any suggestions?

  • Gunner

    Member
    2 June 2009 at 8:19 pm

    Coming from left or right side or just crank in general, when just pedalling normally or only when under pressure????

  • SeanO

    Member
    2 June 2009 at 8:36 pm

    What crankset is it? 😕

  • Steve Kish

    Member
    2 June 2009 at 8:40 pm

    First thing I’d do is check that the bottom bracket axle bolts are holding the cranks on tightly enough and that there’s no sideways play whatsoever whilst grasping the pedals.

  • chrisfrench

    Member
    2 June 2009 at 9:40 pm

    Its the same wether under pressure or not, but its a bit more pronounced when pedalling against the brake for example.

    Chainset:

    Shimano FC-M521, Hollowtech arms, Octalink spline with replaceable outer rings

    Chainrings:

    44A x 32S x 22S

    Bottom Bracket:

    Shimano BB-ES25, Octalink spline, cartridge bearings, 68mm x 118mm

    Its a Specialized rockhopper expert, 2009.

  • SeanO

    Member
    2 June 2009 at 10:58 pm

    Like Steve said; check that the crank arm is tightened onto the axle. Also, check your chain for any stiff links as it could be a clunk of it going through the rear mech etc.

  • Gunner

    Member
    3 June 2009 at 6:49 am

    Is there any chance you could try a different set of pedals for a day just to eliminate them as a possibility.

  • chrisfrench

    Member
    3 June 2009 at 3:24 pm

    I will try and change them, i’d be disappointed if it were them after such a short period of time.

    Can anyone recommend a good read/source of information pertaining to bike repairs?

    I used to be a car mechanic so i’m up to speed with practical engineering, I just like some reference material….

  • Gunner

    Member
    3 June 2009 at 4:28 pm

    Try these links:

    http://www.parktool.com/repair/bikemap.asp

    http://www.utahmountainbiking.com/fix/

    Remember that pedals are usually the cheapest and poorest component that often come with a bike as they are soon upgraded by the owner as a matter of personal preference.

  • chrisfrench

    Member
    3 June 2009 at 4:58 pm

    They are upgrades, DMR V8’s

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