Different tires, no rubbing ? - Mercedes Benz SLK Forum

Tires, Wheels, Brakes & Suspension Discussion and information regarding tires, wheels, brakes and suspension.

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#1 Old 01-05-2015
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Different tires, no rubbing ?

Hi,

today I installed my 19" AMG IV's. Turns out the front tires are slightly rubbing against the fenders when driving through a hole Due to a offset of 30 (8.5J rim) they also stick out a bit. Front tires now installed are 235/35/19 Michelin. Rear data:255/30/19 9.5J. I have a sport suspension.

I really like the 19" rims a lot so I don't wanna swap them for 18" versions.

With the help of an online tool I calculated that fitting a 235/30/19 tire would result in a wheel which is 0.925" lower in total height. This should give me 0,46" more clearance between tire and bodywork.
Accordingly this tool also tells me I need 12mm spacers on the rear to make all 4 wheel stick out evenly.

Am I correct ?

Thanks.

Paul
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Last edited by Paulus de B.; 01-05-2015 at 03:48 PM. Reason: Picture added
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#2 Old 01-06-2015
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Update:

Because I have a (almost) brand set of new winter-tires I today fitted the AMG's with F: 235/35/19 R:255/35/19. It's still winter over here.

I also tried a set of summer-tires with dimensions 245/35/19 & 275/30/19. They fitted also. Now I know I can change to these when spring is arriving.

Still the problem is the front wheels are sticking out somewhat (see thumbnail) and they tend to rub against the fenders when going through a hole.

I've thought about a couple of solutions.

1) Rolling the inner lip of the fender, this may help a bit.
2) Sticking a pieces of rubber between the springs (I don't prefer this option).
3) Raising the front with other springs (I prefer this option).

If you look at my car right now the front fender is lower than the rear fender so I think lifting the front a bit won't hurt the looks of the car. I don't know if a 1 inch rise will hurt driving stability....

What do you think ?

Thanks.

Paul
I have a R171 200 with sport suspension. F: AMG IV 8.5J ET30 R:AMG IV 9.5J ET31 (2piece originals).
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#3 Old 01-07-2015
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Update:

Turns out the former owner replaced the front brakes with wrong replacement units.
These were thicker than the ones Mercedes advices.

The brakes make the rims stick out almost 2cm and this is the reason my ET30 rims stick out.

I'll order new ones and after the replcement I'm pretty sure this mystery is solved.

Thanks.

Paul
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#4 Old 01-08-2015
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Originally Posted by Paulus de B. View Post

I'll order new ones and after the replacement I'm pretty sure this mystery is solved.

Paul
Hi,

I see one can buy different sizes (diameter and height). Does anyone know what the original data should be ? I want my AMG IV's (8.5J ET30) wheels to fit perfectly this time

Thanks.

Paul
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#5 Old 01-08-2015
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Hi Paul,

I think one of the following.
if you have the full sports gear, so with 330 mm rotors partnr A 203 421 13 12
Bremsscheibe A 203 421 13 12 | 203 421 13 12 Kategorien A 203 421 13 12 | 203 421 13 12 Bremsanlage A 203 421 13 12 | 203 421 13 12 Scheibenbremse A 203 421 13 12 | 203 421 13 12 Bremsscheibe 0 986 479 135 Online Shop

If you only have sportsuspension so with standard rotors partnr A 203 421 03 12
203 421 03 12,MERCEDES-BENZ 2034210312 Brake Disc

But if you post your vin here than hopefully someone with access to EPC can chime in.
Don't have EPC myself, sorry.
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#6 Old 01-15-2015
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Hi,

just for the record here's a last update. Changing the brakediscs didn't solve anything
After extensively reading different posts on various fora I came to the following conclusion.

If one wants to go for the original 19" AMG 2 piece IV model (Front 8.5J ET 30) the wheels will stick out a bit on the front axle. The rear ones (9.5J ET 31) will be fine.
If you have a sport suspension the front tires will probably rub against the fenders when driving over ditches. My car did.
The only way to make this as less of a problem is to stick to 225/35/19 tires ( I now have 235/35/19). Also you can roll the fenders a bit. Be careful as this can damage the body paint when not correctly done !

Thanks.
Paul
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