Rear Mech Issue. Help Please.

1964johnr
1964johnr Posts: 179
edited June 2015 in Workshop
I have a problem with my Shimano 105 rear mech which I have not experienced before and therefore don't know how to sort it. Most of the time when shifting up and down through the gears things work well, then i will make a gear change and start peddaling and there is nothing there for a full reveloution of the pedals, then it resets itself and things are back to normal. It's as if the chain jumps off and then back on again, but I know that's not the issue. Any help with a cause and remedy would be appreciated.

Comments

  • rafletcher
    rafletcher Posts: 1,235
    That sounds more like a freewheel failure - the pawls not re-engaging after a freewheel. A good clean out and regrease might be in order.
  • dj58
    dj58 Posts: 2,223
    ^ That is what I was thinking, loss of drive due to the pawls in the freehub not engaging correctly. How old is the wheel/hub, what mileage has it done?
  • 1964johnr
    1964johnr Posts: 179
    I have Mavic Aksiums with only 1100 miles on them. Just over 1 year old.
  • rafletcher
    rafletcher Posts: 1,235
    1964johnr wrote:
    I have Mavic Aksiums with only 1100 miles on them. Just over 1 year old.

    Matters not, I had a Hope freewheel fail after a couple of hundred miles. Pull the freehub and have a look. On mine one of the pawls had gone awol, never did find it!
  • svetty
    svetty Posts: 1,904
    You relate changing gear to the appearance of the phenomenon - not sure why this should trigger a freehub problem as you shouldn't be stopping pedalling whilst changing gear? Could be that you're getting failed shifts - usually upshifts - where the chain doesn't quite make it to the larger sprocket then slips back? This can often be traced to a cable sticking issue or a bent hangar?
    FFS! Harden up and grow a pair :D

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