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New wheels

Discussion in 'Bodywork, Tyres, Wheels & Trim' started by ells_924, Oct 12, 2017 at 5:33 PM.

  1. ells_924

    ells_924 Member

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    hi guys,

    now iv looked at the pined post and this one is not covered...

    I am looking at some very nice 8J 18inch wheels but would that be ok on my clk 320cdi 07??

    my concern is not the rears as they are 8J 17 at present but the fronts?
    also what Tyre size would you put on them and will it cause the Tyre pressure sensor any issues?

    Thanks guys
     
  2. Wighty

    Wighty Senior Member

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    If you look in the back of the car handbook it will list wheel and tyre sizes which are suitable .
     
  3. OP
    ells_924

    ells_924 Member

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    ah but there looks to be nothing for 8J front and back have different profiles too
     
  4. LostKiwi

    LostKiwi Senior Member

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    We need way more info.
    What are the current wheels (diameter/width/ET).
    What are the current tyres (width/aspect ratio).
    Then same for the new ones.

    Also... what are the new wheels off (If MB).
     
  5. OP
    ells_924

    ells_924 Member

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    ok currents are std mb 17s running 225/45 front and 245/40 rear

    new wheels are 18/8j front and rear and are 5/112
     
  6. LostKiwi

    LostKiwi Senior Member

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  7. John Laidlaw

    John Laidlaw Senior Member

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    Sorry still need the ET ( the 5/112 is the bolt data) and the tyre dimensions on the new ones
    As LK asks if we could know what the new wheels are from it may help.
     
  8. Yugguy

    Yugguy Senior Member

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  9. LostKiwi

    LostKiwi Senior Member

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    Ok let me explain (now that I'm on a laptop and not a phone)...

    ET is the offset. This is the spacing of the centreline of the wheel from the hub face. A low ET means the wheels are closer to the edge of the car (wheelarches), a high ET means they are closer to the suspension. Some cars (Smarts) have a negative ET butmost are positive.

    Width has a bearing on ET when looking at whether things will fit. For example replacing an 8.5" wide rim with a 7.5" wide rim with the same ET will move both sides of the rim 12.5mm further away from both wheel arch and suspension. To keep the outer edge of the wheel in the same place therefore would mean reducing the ET by 12.5" In most cases as you go wider in rim you need to reduce ET in order for the wheel to clear suspension components but for the front this can compromise clearance for the wheel in the wheel arch when on full lock.

    Diameter has a bearing on tyres. In general going up an inch in tyre size will mean a reduction in profile.
    You are aiming for all four wheels to have the same diameter as the original fitment.
    Use a website such a s www.willtheyfit.com to see in a graphical representation what the difference will be between old and new setups. Note this is NOT a definitive guaranteed fit if you go away from existing overall sizes.

    Spigot size is the diameter of the protruding centre ring on the hub. This secures the wheel correctly to the hub and must be the same for the wheel and hub.

    Pitch circle is the diameter of an imaginary circle inscribed around the centre of the mounting bolts. Pretty much all MBs are 5/112 so 5 bolts on a 12mm diameter circle.

    Finally bolts...
    Mercedes use a radius headed bolt. Early cars use an M12 bolt with an R12 head. Later cars use an M14 bolt with an R14 head.
    You cannot safely use an R12 bolt in a wheel that is designed for an R14 bolt or an R14 bolt in a wheel designed to acept an R12 bolt. This is VERY important! You can get special M12/R14 bolts to allow the use of later wheels on earlier vehicles but you cannot get bots that allow older M12/R12 wheels to be fitted to newer vehicles with M14 threaded bolts.
    Aftermarket wheels typically use a 60 degree taper bolt (in M12 or M14 sizes). You CANNOT use M12/R12, M12/R14 or M14/R14 bolts in a wheel designed for 60 degree taper bolts.
    Be sure to use the correct bolt for the wheel being fitted.
     
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  10. JBell

    JBell Senior Member

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    Ok, on an 18" wheel for a CLK the tyre sizes are:

    225/40 R18" Front
    255/35 R18" Rear

    OEM Wheel sizes are:

    7.5Jx18 ET37 Front
    8.5Jx18 ET30 Rear

    An 8" wide wheel is too narrow for the rear tyre (the max on an 8" wide wheel is a 245 tyre) you need an 8.5 - 9" wide wheel
     
    Last edited: Oct 13, 2017 at 2:09 PM
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  11. GlosRichCLK

    GlosRichCLK Senior Member

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  12. OP
    ells_924

    ells_924 Member

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    ok then guys, looking at riches post this is a no go as i need a wider wheel on the back!

    oh well back tot he drawing board.....
    thanks to all that guided me
     
  13. JBell

    JBell Senior Member

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    Are you looking at new??? If so you can use an 8" front and 9" rear wheel

    So:

    8x18" ET35 front
    9x18" ET35-40 rear

    will fit straight on that car
     
  14. OP
    ells_924

    ells_924 Member

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  15. JBell

    JBell Senior Member

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  16. LostKiwi

    LostKiwi Senior Member

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  17. OP
    ells_924

    ells_924 Member

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    well thats positive,
    what tire would you go with? 245 40 front? 245 35 rear?
     
  18. LostKiwi

    LostKiwi Senior Member

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    Same front and rear. Aside from that pick one (but they must be the same overall diameter front and rear and no wider than 245).
     
  19. Mark A

    Mark A Senior Member

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    If you are changing from 17” to 18” and keeping the same width, the profile has to reduce. As above use on of the online calculators to work out what you need otherwise your speedo will be out.
     
  20. JBell

    JBell Senior Member

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    225/40 R18 all round would be perfect
     

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