Rim alignment in relation to hub (rear wheel)

t0mb
t0mb Posts: 8
edited March 2015 in Workshop
Hi,

I'm hoping for some help/advice regarding the lateral positions of my rim in relation to my hub on my rear wheel. As it currently stands the rim favours the cassette side of the hub by 8 or 9mm. Is this a problem?

Any advice or help is greatly welcome,

Many thanks,

Tom

Comments

  • desweller
    desweller Posts: 5,175
    How have you measured it?
    - - - - - - - - - -
    On Strava.{/url}
  • t0mb
    t0mb Posts: 8
    I placed the wheel in a truing stand and measured the distance to the rim from the stand-frame using a combination square. Hope thats clear, I could post a pic if necessary?

    Is it an issue?
  • nicklouse
    nicklouse Posts: 50,675
    As long as the measurement from each side is the same then the rim is centred. But if the frame requires a zero dish wheel (rare on road frames) then the measurement will be diferent.

    It does not matter what it looks like. It depends on what is correct.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • marpick
    marpick Posts: 49
    t0mb wrote:
    I placed the wheel in a truing stand and measured the distance to the rim from the stand-frame using a combination square. Hope thats clear, I could post a pic if necessary?

    Is it an issue?

    Also to bear in mind that to provide it 'central' if one side measures 8/9mm then it's half that value.
  • t0mb
    t0mb Posts: 8
    thanks nicklouse... i dont suppose there's a quick way to determine the dish amount? Or would it be listed online somewhere?

    Again many thanks guys!
  • nicklouse
    nicklouse Posts: 50,675
    You have a truing stand. Use that.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • t0mb
    t0mb Posts: 8
    Actually reading my original post, I think it was a little unclear.... what I was actually trying to say was that the rim is not centred in relation to the chainstays. Not that it was not centred in relation to the hub.

    apologies
  • keezx
    keezx Posts: 1,322
    Put the wheel in the frame the other way round.
    The result will determine the cause. (frame or wheel)
  • Guernsey Donkey
    Guernsey Donkey Posts: 144
    Go to http://www.prowheelbuilder.com/spokelengthcalculator/

    Change Wheel type to "rear" then look at the picture.

    Your rim ought to be centred between the two ends of "AXLE WIDTH" not necessarily between the the two flanges.
  • Monty Dog
    Monty Dog Posts: 20,614
    Is the rim centred between the brakes? The spoke angle on the drive side is steeper to give clearance for the cassette - can make the rim appear off-centre. Flip the wheel around in the wheel stand to see that rim is centred.
    Make mine an Italian, with Campagnolo on the side..
  • desweller
    desweller Posts: 5,175
    The rim needs to be central between the lock nuts. If the rim is not centred in the chainstays then it does sound like the dish is out, but the most accurate way to check is in your truing stand. If your square is long enough to touch the rim across its full diameter then you can make a reasonably good assessment of the dish in the stand. However you can buy or make a dishing tool that makes the measurement a bit easier.

    Where does the wheel come from?
    - - - - - - - - - -
    On Strava.{/url}
  • JayKosta
    JayKosta Posts: 635
    The important thing is that the rim is inline with the seat tube and the head tube.

    If it's not, then mount the wheel with cassette on the non-drive side and inspect again.
    If the alignment of the rim has not changed, then the dropouts are not in proper alignment with the ST & HT.

    If the alignment of the rim has 'flipped' so it's now misaligned on the other side, then either the hub is not aligned on the axle, or the 'wheel' dish is wrong. could be as simple as an extra or missing spacer/washer.

    Jay Kosta
    Endwell NY USA

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