jak112460

I'm going to be recieving my 2006 SLK55 this week and I'm wanting to know if anyone has tried a 19x10 wheel on the rear? Or a 10" wide rear wheel. I looked in the search area and founding nothing. I'm hoping a vendor to this forum has done a 10" wheel without rubbing. Thanks.

jak112460

Ok, guess I'm going to be the one who does, a 10" wheel on the rear, first.

vbrisebo

Hi,

I'm out in Los Angles and there are some places that routinely put 19x10 in back and 19x8.5 in front... I think they have some custom spaces but I know it can be done...

I'm going through the process myself but as I wnat to keep some level of comfort I'm going with 18x10 and 18x8.5...

I opted for the OZ racing Superleggera 3 piece with the center powdercoated semi gloss black... (my SLK is black...)

Good luck!

Vince

Ken Uyeda

What tire are you going to use? The fitment on a R171 is usually:

8.5x19 ET31 225/35R19 FA
9.5x19 ET31 255/30R19 RA

255's on a 10 will be stretched.

jak112460

I want to use 18x8.5 front with 225/40/18 and 19x10 with 285/30/19 tires. I have used this type of combination before and it looks great. I have noticed that when there is the same diameter wheel used all around, but with the rears having a deep dish, it makes the front wheels look bigger in diameter. Using a bigger diameter wheel in the rear offsets that look. Many manufacturers use a bigger diamet wheel in the rear. I just needed to know if anyone had used a 10" wheel in the rear and if there was any rubbing.

Ken Uyeda

The 18F/19R trick will offset the optical illusion that makes the rear wheels look smaller than the fronts. However running the 285/30R19 is going to increase the total wheel height by almost an inch in the rear over stock. Most likely modifications are going to have to be done in order to prevent rubbing issues. Maybe a 265/30R19 would be a better fit

jak112460

The 265 sidewall is shorter by almost a 1/4" than the 225. The 285 is almost exactly the same as the 225 sidewall. The 285 is less than half an inch taller than the front tires and only 2.8% different from the front. It's within specs to not cause ABS problems. The only question is will a 285/30/19 tire fit without rubbing.

Ynot

You are not the first, and probably not the second either. EDSLK in the other benz forum has 19x8 front on 235/35/19 and 19x10 rears on 265/30/19 PS2 with a little rubbing.

Here's a pic of his SLK


19x10 fits fine, just have to have the correct offset and tires. I should get mine in a couple of weeks. I'm going with 19x8.5 front 19x10 rear on 235/35/19 front and 265/30/19 Nittos. I was originally going with 9.5 rears but DCR said I could go 10" without a problem. Nittos and Toyos will fit 265 w/o rubbing and fender rolling.

dsb

First, for all you nubies, please update your profile. It makes it easier to answer your questions. Yes, you may list the info in your original post, but then one has to scroll up and down to figure it out, and me is too lazy for dat.
Onto the thread...



What vehicle do you have? Post some pics when it's done. It sounds good



I agree. I love Edslk's 350. It looks aggressive yet classy. My only gripe is that the rear tire looks stretched as depicted in the image above. Also, will that cause any concern in AutoX? I raced my first one this week! Awesome, and everyone loves watching/hearing the 55!



Funny. I never thought of this, but you raise a great point. On my original 350, I had noticed this and some even commented about the "smaller" rear wheel. I think I may go for the 18F/19R sizes when I make the change on my 55.



Fronts: Why would you want to stretch the same size front tire onto a wider wheel? If you are getting a wider wheel in front, why not increase the tire size to get better traction?
Rears: Instead of comparing sizes simply from front to back, shouldn't you compare them from stock to aftermarket? Using your suggestions means that the rears increase in diameter from 24.75 to 25.73" which equals 3.89% difference. Also the width would go from 9.64" to 11.22". If a 265 rubs, then the 285 must rest on the fender.

I italicized what I think would be the best solution. I am no expert, but I think it would be compatible and give you the look/performance you want.

Front stock size 18 x 7.5
-225 40 18F Diameter = 25.08" Sidewall = 3.54 Total width = 8.85
Alternatives: 18 x 8.5
-225 40 18F Diameter = 25.08" Sidewall = 3.54 Total width = 8.85
-235 35 18F Diameter = 24.47" Sidewall = 3.23 Total width = 9.25


Rear stock size 18 x 8.5
-245 35 18R Diameter = 24.75" Sidewall = 3.37 Total width = 9.64
Alternatives: 19 x 9.5 or 19 x 10
-255 30 19R Diameter = 25.02" Sidewall = 3.01 Total width = 10.03
-265 30 19R Diameter = 25.25" Sidewall = 3.12 Total width = 10.43
-285 30 19R Diameter = 25.73" Sidewall = 3.36 Total width = 11.22

jak112460

I have done this stuff many times so I'm getting good at it. The reason I want to stay with stock size in front is because I do not want to go any taller on the side wall. If I use a 285/30/19 on the rear and 225/40/18 on the front, my side wall height is 3.4 rear and 3.5 front. My second choice for rear tires would be 275/30/19 with a 3.2" sidewall. I don't understand why the factory would use a smaller diameter tire in the rear. The front tire diameter is actually taller than the rear. Why would they do that?

jak112460

I did a search on Tire Rack and found that a 225/40/18 tire has a wheel fitment of 7.5 to 9.0". I think an 8.5" wheel would be just as acceptable as 8". My main concern would be if a 275 or 285/30/19 tire would fit without rubbing. Has anyone had rubbing issues and if so where they on the outer fender or inner fender? Thanks

dsb

If you go to 235/35/18 you will have a sidewall height of just 3.23 which is smaller and you get a .5" wider tire for better traction.


Not sure why they would use a taller tire in front. It could be to soften the blow of potholes, etc. This would also help cushion the weight of the big V8.

If you plan to get those wheel sizes, I would go with:
235/35/18 and 275/30/19. The front would be okay but the rear fenders would most likely need to be rolled. I should mention that you may be the first slk55 to use 10" wide in the rear. I believe everyone else was using it with 350. I don't know if the brake caliper or suspension will affect the outcome.

dsb

If you want no rubbing then you should...

18 x 8.5 with 245/35/18F
19 x 9.5 with 255/30/19R

A good tire calculator is located here:
http://www.1010tires.com/TireSizeCalculator.asp

I edited the front size from 235 to 245. Makes more sense IMO.

jak112460

That would make the side wall a 1/4" taller in the front than the back. The best combo is either 275 or 285/30/19 and 225/40/18. Once I get the car to my house I will get this figured out.

dsb

Are you really going to notice a 1/4" difference from front to back?

Besides, I would be greatly concerned with the rear diameter changes:
245/35/18 = 24.75" STOCK
275/30/19 = 25.49"
285/30/19 = 25.73"

How large can one increase the diameter without adversely affecting performance?

jak112460

This is my concern also. If I leave the front size the same and do the rear in 275 or 285 I'm only changing about 3% or slightly less. In most cases you can go 4% safely. The car manufacturers have to have a built in range because tires all not all exactly the same diameter even when they are supposed to be for a given size. Plus the fact that tires wear and that has to be accounted for also. Can someone tell me if the SLK55 and SLK350 come with the same size tires?

dsb

Sure... I had the 350 and now have the 55.

slk55
225/40/18F 25.08" diameter.
245/35/18R 24.75

slk350
225/45/17F 24.97
245/40/17R 24.71

Freddyboi

Soo.... if i went with 19x 10, 265/30/19, will i be okay?? 35 offset

jak112460

From the reasearch I have done the 265/30/19 will not rub. The thing is that a 265 will be stretched pretty far on a 10" rim. If you are going to do a tire that small you should do a 9.5" wheel.

Freddyboi

i was gonna get the iforged in the classified section that has the 19x8 f and 19x10 rears thats why..