jack1560

i have a 2004 sl55 and i wanted to change the rim size to 19" from 18". Is that a problem?

AKnight55

nope. try using the search function on the forum.

jack1560

i have tried searching and I can't find anything regarding switching wheel size on sl55

BeltFedBob

I just did a 18 to 19 swap today and no problems. Went with 25F-28R offset and 10" rears.
(SL65 stock rins.)

jmf003

Not all 18" wheels will clear the AMG brake calipers but the AMG 18" wheels that were designed for the SL55 will. My car has 18" AMG Style V wheels.

BeltFedBob

He wants to go from 18 to 19" so long as the offset is correct he should have no problems.

mikesSL55fla

I also have an 04 I am running 20's with 305-25-20's in the rear. The key to me has been the tires. I run PS 2's they are a bit pricey but worth it.

soulsearcher

Searching wheel swap for an sl55 is not the way to go.

Start searching the following first until you understand the metrics behind the subject and you'll be able to make good decisions about your wheel upgrade.

tire diameter (OD)
Offeset
plus sizing

Some help:
http://www.1010tires.com/tiresizecalculator.asp
http://www.1010tires.com/WheelOffsetCalculator.asp

jmf003

Offset is important, of course, but so is the diameter of the barrel. The AMG brake calipers require a large barrel diameter.

There are lots of 18" wheels with the right bolt pattern (5x112) and offset (low to mid 30s) that won't work because the barrel is too narrow. For example, 18" BBS RS-GTs won't fit an SL55.

dbesins

going to 19 is fine, I suggest getting the same offset as the sl65 wheel, that would be your best bet. the OEM sl65 tire are 255-35-19 and 285-30-19 try to keep it wihtin those parameter. if you decide to go with larger rubbers/wheels you will probably need a more aggressive offset (the lower the offset the more the wheel will "stick out"
a good rule of thumb is to start with sl65 standard size (offset) and you calculate how much larger is the wheel/tire take half of that value and that how much you need to take off from the OEM offset.

Example if OEM rear is 285 (tire) and you decide to go 305. the difference will be 30 half is 15mm so use an offset of approx. 28-15=+13.

I used this in the past and worked well, I am just trying to help. I know it is not really scientific...

as for the diameter if you go 305 in rear on a 19" wheel I would conceder going 305-25 or 30 I am not sure.

Hope this help

jack1560

the wheel size i'm using is front 255/30/19 and the rear 285/30/19. what came with the car is fronts 255/40/18 and rears 285/35/18

jmf003

Sorry...misread your original post. Thought you were moving to 18s, not from 18s.

Basically if the wheels clear the calipers without rubbing and the tires don't rub on the inner or outer fender, you're in the clear. 19s are more likely to clear the calipers than 18s but even 19s are a problem with some brands, e.g. Oz.

Your front tires are slightly underspec on the diameter. You want a tire diameter as close to 26" as possible. That would be 255/35-19 rather than 255/30-19.