Measuring the width of an alloy wheel

Discussion in 'Wheels, Tyres, Brakes & Suspension' started by Jason1145, May 26, 2016.

  1. Jason1145

    Jason1145 Hardcore MB Enthusiast

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    Hello all

    So I found out the correct way to measure a wheels width is to measure form the bead seat to the opposite bead seat (Shown in Photo 2)

    Question is.... on this alloy shown below that is 7.5'' wide... the inside measurement is 7.5'' but the outer edge to outer edge is 8.5''... is this normal or does it seem too thick in the outer lip area to account for a whole extra inch?

    [​IMG]

    [​IMG]

    [​IMG]
     
  2. Happytalk73

    Happytalk73 MB Club Veteran

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    I always wonder why the diameter is not as you'd imagine either. The 18" alloys on our car actually measure 19.5" at the widest point why is this?

    Ant.
     
  3. whitenemesis

    whitenemesis MB Club Veteran

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  4. renault12ts

    renault12ts MB Club Veteran

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    ...because it's the tyre's inner diameter that is being measured.
     
    1 person likes this.
  5. MarkII

    MarkII Hardcore MB Enthusiast

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    In answer to the OP - that looks perfectly normal.

    Whose wheels are they?
     
  6. OP
    OP
    Jason1145

    Jason1145 Hardcore MB Enthusiast

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    Well that's reassuring to know.... the wheels are some new ones I've picked up but won't be fitting them for a couple months atleast, not until the wife learns to park against kerbs a bit better.
    7.5x18j, et45, 5x112, CB 66.6
    [​IMG]
    [​IMG]
     
  7. OP
    OP
    Jason1145

    Jason1145 Hardcore MB Enthusiast

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    So this is my hub.... the wheel I had to buy needs to have a Centre Bore Hole of 66.6, does the wheel then sit on that little rim in the centre then... called Hubcentric fitment?
    [​IMG]
     
  8. renault12ts

    renault12ts MB Club Veteran

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    Yes...just as the standard wheel does.
     
  9. boxbrownie

    boxbrownie Hardcore MB Enthusiast

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    Yes, and you had better throw your dog poo bag in the proper bin as well :D
     
  10. OP
    OP
    Jason1145

    Jason1145 Hardcore MB Enthusiast

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    Thanks Renault, Box Lol that's my nuts in there.... erm!
    I never knew about different nuts... ball seat vs tapered.... not to mention ginger ones fnaarrrrr.

    Looks like I'm all set, ta chaps.
     
  11. MarkII

    MarkII Hardcore MB Enthusiast

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    Should look good on the car :thumb:


    I'm never concerned about my other half kerbing the alloys
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    that's what her Yaris is for :D
     
    Last edited: May 26, 2016
  12. Happytalk73

    Happytalk73 MB Club Veteran

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    They do look great Jason.

    Post a few pics when they're bolted on.

    Ant
     
  13. OP
    OP
    Jason1145

    Jason1145 Hardcore MB Enthusiast

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    Wifey talked about buying a lil car for herself but I can't quite justify that just yet lol.
    I forgot to measure the top to bottom to see if they are more than 18" Ant, in storage now lol will revisit in a couple months. :)
     
  14. Flackadder

    Flackadder Hardcore MB Enthusiast

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    Some sort of rubber would advantageous before fitting to car !
     
  15. MarkII

    MarkII Hardcore MB Enthusiast

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    Nah, improves the 'direct' feel of the steering.....and the shower of sparks looks pretty :D
     
  16. OP
    OP
    Jason1145

    Jason1145 Hardcore MB Enthusiast

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    No rubber, this is how I lower the car!
     
  17. Happytalk73

    Happytalk73 MB Club Veteran

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    No at all. To lower, leave all 4 wheels off the car. :D
     
  18. OP
    OP
    Jason1145

    Jason1145 Hardcore MB Enthusiast

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    Now that's plain silly!:bannana:
     

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