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2001 SLK 320
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Discussion Starter #1
I have a 2001 SLK 320 non-sport version. What is the widest tires I can put on the front and back on the stock wheels. Stock tire width is 205 front and 225 back.
 

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SLK32, ML430
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What width are the wheels? Note that max width can vary by tire manufacturer. Tires rated at the same width will vary in actual width among manufacturers.
 

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2002 SLK 32 AMG, bone stock. 1987 190E 2.3-16 valve (destroyed). 2005 E320 new toy.
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225/45 x 17 in front, minimum width 7".
255/40 x 17 in back, minimum width 8".
Some 235/40 x 17's will fit in front, but not all manufacturer's tires will be free of rubbing. The minimum width for the 235 is 8".
Does that help?
 

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2001 SLK 320
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Discussion Starter #4
Thank you both for your responses. I do not know the stock wheel width, but they are the 16 inch wheels that come with the car. I was thinking that since I need new tires, if I go with wider tires, it would improve safety (bigger contact patch). I came up with combo of 225/50/16 (205/55/16 original)in front and 245/45/16 (225/50/16 original)in back but I don't know if this will fit on the original wheels.

It would be great if anyone that has done this can post their results.

Also, how do you search on a topic (I am new to this forum).

Thanks
 

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2002 SLK 32 AMG, bone stock. 1987 190E 2.3-16 valve (destroyed). 2005 E320 new toy.
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Consider 225's all around........

The bigger tires in back are not going to help you much if at all, and will likely hurt performance some.
225's in front will help the understeer common to the SLK, and 225's with less unsuspended, rotating weight in back will help acceleration over 245's or 255's. Plus they cost less. [:D]
If you're only interested in the look, have at it. The bigger tires do look more menacing, but since the fronts do most of the brakeing, the bigger tire in back woun't help much.
By the way 225's will fit on the stock front rims no sweat..... [;)]
 

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SLK320, MKV Jetta TDI, Mini Cooper S, Lincoln Mark LT
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Going from 205/55/16 to 225/50/16 is good because the diameter difference is only 0.09% and you can put them on a 7" width rim.

Going from 225/50/16 to 245/45/16 is good because the diameter difference is only 0.69% but you will want to make sure your rear rims have a width of 8".

I believe even the stock non-sport SLK230 had 7" rims in front and 8" in back. The sizes are stamped on the inside of the rims so check them before you put the tires on.
 

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2003 SLK32
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I'm running 255/40 17 Goodyear F1 GSD3 on back of my 32 with stock AMG wheels with no problems. Better for off the line traction, slightly increases the push in hard cornering with 225/45 17 on front. I would think it hurt my gas mileage a little too. Very seldom do I get to max perform on cornering, but have more opportunity to use the traction in "day to day" driving. I need to get it on a track, autocross course or Tennessee mountain back road to get a good feel for the cornering. Check out the Tire Rack web site, they have a lot of good information.
 

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flysmith you will actually get better gas mileage with the 255's (if there is any change at all). The 255's effectively raise your gearing so you are turning fewer revolutions at any given speed.
 

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2003 SLK32
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The gain or loss is so small I have been unable to measure a difference. Even though the tire is slightly larger in diameter, the speedometer still checks exactly with GPS. I expect there is more rolling friction with the approx. 1 inch wider contact path accross the back tires, but I have not seen a difference in economy either. I have "noticed" a small difference in "accidently breaking traction" with the ESP off. I think this is more due to tire compound compared to the continentals than tire width. All are my impressions and very unscientific, but subjective opinions are what we add to the mix. You can get tire tests to compare the scientific test values.
 

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flysmith - 3/25/2005 8:53 AM
I have "noticed" a small difference in "accidently breaking traction" with the ESP off. I think this is more due to tire compound compared to the continentals than tire width. All are my impressions and very unscientific, but subjective opinions are what we add to the mix. You can get tire tests to compare the scientific test values.
Are you saying you think the Conti's gripped better or had better initial bite?
 

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2003 SLK32
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No, the Goodyears have a much better bite. I was trying to say the Goodyears are so much better, I don't think the tire width is a big contributor to the better bite. If the PS2s are much better, you might not need ESP to prevent wheel spin[:)]
 

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2001 SLK 320
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Discussion Starter #15
Sorry to bring this up again.

I talked to someone from Tire Rack and they said that the bigger tires may rub due to the offset. Is this correct?

Thanks,
 
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