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Fulcrum Racing 5s: should cassett spindle/hub be off-centre?

barrybridgesbarrybridges Posts: 420
edited May 2010 in Workshop
Just a quick one: last night I put my new bike (only 3 rides on it from brand new, less than 200 miles) onto the turbo to give it a spin but noticed a 'clicking' sounds on each wheel revolution.

When I locked directly down (from my riding position) at the rear cassette, I can see that the cassette itself is centred perfectly on the axle but the spacers between each chainring are not centred, so it looks like the cassette is wobbling.

e.g. The skewer goes directly through the centre of the cassette, but the spacers between each ring are offset slightly.

Is this normal/part of the design for campag centaur cassettes?

Posts

  • AirwaveAirwave Posts: 483
    This is normal as the drive side spokes are shorter than the non drive side.So the hub is off centreI i have some Mavic Askiums &Shimano rs10&20's that all have the same spoke pattern.
    TT photos http://www.flickr.com/photos/steverob/
  • shmoshmo Posts: 321
    Sounds weird. Are some of the spacers asymmetric causing the cogs to angle in towards each other? I'm using the same wheels with a Shimano cassette and the cogs all spin true with no wobble, never seen it any other way. But then I'm a novice bike mechanic and it could be normal for all I know.

    Have you got the tools to remove the lock ring and take a better look?
  • John.TJohn.T Posts: 3,698
    Are you sure it is not the pick-up ramps on some of the teeth. Certain teeth are 'twisted' to help with gear changes.
    My Fleet.
  • Av itAv it Posts: 105
    Its not from wiggle is it? its not a focus is it?
  • barrybridgesbarrybridges Posts: 420
    No, not from wiggle or a focus.

    It's a brand new bike, from the shop, with less than 200 miles on it.

    Maybe I'm not describing it correctly (and maybe it's not an issue at all):

    Between each cog on the rear cassett there is a spacer.

    Although the cogs themselves are perfectly centred on the axel of the wheel, the spacers are not, so it looks like they're wobbling. It's not all the spacers either, but just the gold-coloured ones grouped together nearer the larger cogs.
  • John.TJohn.T Posts: 3,698
    Do the spacers appear to move up and down or side to side. If up and down do not worry as they are not a tight fit on the freehub. They are just spacers.
    My Fleet.
  • keef66keef66 Posts: 13,123
    " just the gold-coloured ones grouped together nearer the larger cogs."

    I'd assume the largest 3 or 4 sprockets are mounted together on an alloy carrier (my Shimano 105 is like that) so what you see between them isn't really a spacer, nor is it perfecty round so it might appear to be wobbling as it spins.

    I'm off to look for an exploded diagram on the Campag site.
  • keef66keef66 Posts: 13,123
    Actually it looks like they are separate sprockets, but between the bigger ones the spacers are kind of daisy shaped rather than round. Is that what you're observing?
  • keef66keef66 Posts: 13,123
    Double post. That's what happens when you go off looking for campag tech docs halfway through a post!

    Oops!
  • barrybridgesbarrybridges Posts: 420
    keef66 wrote:
    Actually it looks like they are separate sprockets, but between the bigger ones the spacers are kind of daisy shaped rather than round. Is that what you're observing?

    Aha! You might have hit the nail on the head! This could be an explanation - it's perfectly normal, right? Just trying to identify the source of the clicking sound...
  • keef66keef66 Posts: 13,123
    Is it just clicking on the turbo?
  • barrybridgesbarrybridges Posts: 420
    Yes, just clicking on the turbo. This led me to believe, naturally, that the turbo was at fault, but the thing is that it clicks perfectly in time with each wheel revolution - not with each turbo flywheel revolution (if that makes sense?), which suggests it's independent of the turbo.

    I thought maybe it was my shoes clipping the rearstay on each pedal stroke (you know how sometimes that happens) but that doesn't seem to be the case.

    No idea what's causing it.
  • keef66keef66 Posts: 13,123
    I'll bow out now then; not been on a turbo since the fitting session in the bike shop.

    Wheel revolution or crank revolution? Is the front mech cable end hitting the crank??
  • John.TJohn.T Posts: 3,698
    A bit of flint stuck in the tyre perhaps. :wink:
    My Fleet.
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