8J x 18" AMG Mono II - Tyre Stretch

Discussion in 'Wheels, Tyres, Brakes & Suspension' started by charan_singh, Mar 14, 2011.

  1. charan_singh

    charan_singh Hardcore MB Enthusiast

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    Guys,

    I currently have a low (not slammed or stanced;)) W124 coupe running 18" AMG Mono II's.

    Problem: Currently running 215/35/18 - Nankang NS2's, lovely tyre, fits perfectly but im just not confident driving around with such a thin tyre on the front. I need something slightly meatier, but not too meaty! Did try the 225/40.18 with Bridgestones and it was fine...unless someone sat in the passenger side!

    So I was wondering if someone could advise if there is alternative size/company that I could try, perhaps something between the two tyres I have quoted above?

    Only other alternative is to up the spring pads on the front (increasing the height if the car by 4-6mm ish) and wacking on the 225/40's again?

    Will post some pics so you can have a look....

    Any thoughts?
     
  2. Colin_b

    Colin_b Hardcore MB Enthusiast

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    Sounds about the right tyre size for the wheels. Any more than 40 aspect ratio is going to look a bit wrong. 19" wheels possibly, or longer springs.
     
  3. Alps

    Alps MB Club Veteran

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    different tyre makes also make a diferance, i found pirellis and goodyears have a more slanted sidewall therefore better for lowered cars, try a 225/40/18 pirelli tyre and it should be ok.
     
  4. Superspec

    Superspec Hardcore MB Enthusiast

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    Don't you have to keep the rolling distance of the tyres the same as the original fit otherwise it affects the speedo....If you put 40 profile tyres on in stead of 35 profile the rolling distance of the tyre will be further....

    I know the tyre is wider but there sin't enough width change to account for the profile change.

    What size did the car originally have?
     
  5. sportyreptile

    sportyreptile Hardcore MB Enthusiast

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    I've got 8x18's on the W210 and the standard tyre size is 235/40 x18 but that will give you even more sidewall height which is probably not what you want.

    Check this handy little site out, it allows you to compare sizes and gives you an idea of how much your speedo will be out by fitting different size tyres.

    Tire size calculator
     
  6. OP
    OP
    charan_singh

    charan_singh Hardcore MB Enthusiast

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    Thanks guys, dont really care about the speedo.

    Really just looking for combinations of size / tyre brand (and the differing shoulder/tyre wall) that should it the spot, provide a little more meat, yet tuck into the arch.

    Sportyreptile - thanks mate. But i find that these calculators do not take into account the shape of each individual tyre, i.e. 215/40/18 in say ...Nankang ns2, Dunlop SP2000 is completely different to that in say Accelera or Enduro.

    Maybe im just confusing matters!
     
  7. BillyW124

    BillyW124 Hardcore MB Enthusiast

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    Mate, you need fender spacers, this will sort out that problem you have with slight rubbing.

    u really want the right tyre for the wheel. It's bad enough we're riding with 18's on the car in the first place, but a thiner profile than 40 or a stretched tyre will just diminish any ride quality whats so ever of what my be left.

    ideally i would love a 45 profile on 18's but would not be possible unless you want to do fender work.
     
  8. BillyW124

    BillyW124 Hardcore MB Enthusiast

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  9. OP
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    charan_singh

    charan_singh Hardcore MB Enthusiast

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    What is this 'fender spacers' thing dude? How does it work? What does it achieve?

    Sorry if this sounds like a dumb question!
     
  10. BillyW124

    BillyW124 Hardcore MB Enthusiast

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    You mount them in the inner front wing and it gives you the lil extra room you need.

    This doc has it all for Merceds Spec wheel setup, if you want to do it properly. Althogh its 17's listed in it, it's the same principal for the 18's.

    it just shows that merc even thought 17's where to be Maximum,

    we are stupid! :wallbash:

    but what the hek ay?:devil:
     

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  11. BillyW124

    BillyW124 Hardcore MB Enthusiast

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    P.S. its got info on the speedo checking thing aswell.

    to be honest there isnt much diffference from the original 16inch wheel in speedo reading terms.

    you'll find ur speedo will read in the range of 2-3 MPH less than you are actually doing.

    this is easliy tested on the tom tom. With my 17's on my 124, i'm no more than 2mph off when comparing the speed im doing stated on the tom tom.

    thats on a 45 profile tyre, when i make the switch to 18's on a 40 profile, this may increase ever so slightly but by no means get me in trouble with the GATSO or local PLOD.
     
    Last edited: Mar 15, 2011
  12. OP
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    charan_singh

    charan_singh Hardcore MB Enthusiast

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    LOL - that is some extensive document mate, but it looks like a lot of work. Im having the wings off soon anyway, but other than slotting them underneath, it seems more work is required at first sight! ...Hmm, food for thought!

    What a mission... I think it may just be easier to go up a spring pad, and slot the 225/40's back in.....lol
     
  13. BillyW124

    BillyW124 Hardcore MB Enthusiast

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    its ALL about doing things properly mate, thats the factory spec in that document right there.

    Depends how much your motor means to you. The thing is it could get written off tomorow who knows?

    You think the insurance is going to pay out what you think its worth?

    got to be kidding.:mad:
     
  14. BillyW124

    BillyW124 Hardcore MB Enthusiast

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    If you do that then......you're going to be back at square one again with your stance issue.

    These 124 coupes's stances are totally different to those of 124 saloons.

    My azurite blue 124 Saloon was dropped on the original 16inch alloys and the stance was perfect, lower in the front and slightly raised at the back. no drooping effect. It looked even but the key was the stance.

    the ride was sublime. no clunkyness or choppyness to the ride. just right.
     
  15. OP
    OP
    charan_singh

    charan_singh Hardcore MB Enthusiast

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    Ill try that mate. Thanks
     
  16. OP
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    charan_singh

    charan_singh Hardcore MB Enthusiast

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    You got your 18's on yet mate?
     
  17. BillyW124

    BillyW124 Hardcore MB Enthusiast

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    nah, not yet will do it once i get my spring and shock combo completly right!
     
  18. renault12ts

    renault12ts MB Club Veteran

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    Aspect ratio: Aspect ratio is the depth of the tyre wall expressed as a percentage of the tyre width.

    So your 215/35 tyre had a wall depth of 75.25mm, when you put the 225/40s on the tyre wall increases to 90mm. This is too great a difference. And also the reason for the rubbing...you increased the diameter of the tyre so that it fouled.

    When you go wider you must decrease the aspect ratio not (as you have done ) increase it. So a 225/30 would be a better choice since it would have a tyre wall depth of 67.5mm. But to be closer to the original diameter a 245/30 would be better since the tyre wall depth would be 73.5mm (less than 2mm smaller than original).

    You can't say a specific aspect ratio is right or wrong on its own, since it is a function of the width.
     
    Last edited: Mar 15, 2011
  19. renault12ts

    renault12ts MB Club Veteran

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    Don't!!
     
  20. Shude

    Shude MB Club Veteran

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    This is probably what the option code 774 refered to. "Shell modifications" sounds pretty drastic but it's just some plastic washers :)
     

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