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Black spot wheels

Discussion in 'Bodywork, Tyres, Wheels & Trim' started by tode, Dec 9, 2012.

  1. tode

    tode Senior Member

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    Does anyone know what the black spots stuck on the rims are for?

    I presume all rims have them -- if not, mine are about 1/4 " dia.
     
  2. turbopete

    turbopete Senior Member

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  3. harrisis

    harrisis Senior Member

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    This sounds vaguely similar to the white spots that were on the steel rims I bought for the winter from MB.

    They appeared to be stuck over a casting/weld/injection point that didnt get coated/painted during the finish.

    maybe, perhaps
     
  4. OP
    tode

    tode Senior Member

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    As you can see - on each wheel, a black spot. The position has no relation to either the valve or the balance-weight points.

    Just can't see why they bother putting them on. :confused:

    [​IMG][/IMG]
     
  5. hotrodder

    hotrodder Senior Member

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    If there's a convention i'll probably get it backwards but it's probably marking the low spot with regards to runout i.e. as round as the wheel may be it won't be perfect. Sometimes there's a dimple on the rim instead of a sticker.

    Tyres often have similar marks on them, usually a red dot for runout and yellow for the light spot IIRC. They don't always have them but when there's a choice the tyre fitter is supposed to pay attention (yeah, right!) to the red one. This'd be aligned with the mark on the rim or with the valve if the wheel isn't marked. The yellow spot would normally be aligned with the valve
     
    Last edited: Dec 12, 2012
  6. television

    television Always remembered RIP

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    I think as Hot rodder that they are balance marks to aid the tyre fitter
     
  7. OP
    tode

    tode Senior Member

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    That does seem to be the idea. On further googling, came across this article by Wheelsinmotion, which I found very interesting: TYRE MARKINGS WIM
     
  8. DIYMAN

    DIYMAN Senior Member

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    Maybe the black stick on dots are a colour code to indicate who made the final inspection.
     
  9. OP
    tode

    tode Senior Member

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    Have a look here ;)
     
  10. whitenemesis

    whitenemesis Senior Member

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    Unless I missed it tode's links are all for tyre markings?

    I find the idea of using a stick on dot to mark something as permanent as a weight/dimension deviation a bit temporary? First good rain and competent valet and that dot is history.

    I think I'd go with the QA suggestion. IIRC my AMG wheels from Germany had black dots on each rim, until I removed them prior to waxing!
     
  11. OP
    tode

    tode Senior Member

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    Try going through the article, right to the end :D

    This article from "Motor" has some interesting stuff, and describes the stick-on markers very well: MOTOR.

    As far as rain washing them off, mine are still very firmly in place, and the 2nd hand rims that I recently bought from Germany still have theirs.
    I have just waxed over mine. ;)
     
  12. whitenemesis

    whitenemesis Senior Member

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    The article mentions using dimples or stamps, not a sticky dot? Or have I missed it again?
     
  13. OP
    tode

    tode Senior Member

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    Maybe a quick visit to Specsavers ? ;)

    "OE tire suppliers are required to
    mark a tire’s radial runout high point
    and OE wheel makers are required to
    mark a wheel’s radial runout low point

    This makes it easy for the OEMs to
    match-mount tires to wheels from a ra
    dial force variation standpoint during
    production. In some cases, these mark
    are made with paint dots that help ser
    vice technicians remount tires down the
    road. However, sometimes these mark
    are made using temporary stickers
    which either fall off or are removed af
    ter mounting. This leaves no readily vis
    ible reference marks for the tire techni
    cian for future service
    ." :)
     
  14. television

    television Always remembered RIP

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    Like my reply then in post 6 :D
     
  15. OP
    tode

    tode Senior Member

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    Right. :)

    But these stick-on ones would seem to me to be designed to help the car maker achieve a perfect tyre mounting, and the customer has to make the best of it if the sticker comes off. :rolleyes:
     
  16. whitenemesis

    whitenemesis Senior Member

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    Thanks tode, appointment made .. :Oops::Oops:
     
  17. whitenemesis

    whitenemesis Senior Member

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    Like hotrodder's reply in post #5 :rolleyes:
     
  18. television

    television Always remembered RIP

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    Then indeed yes :D:D
     

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