lyjw88

If I were to run a 19" staggered setup on a 4matic model, which tire size should I go with the rear?
It is crucial to keep the rolling diameter the same for 4matic, so which one is correct? 265/35/19 or 265/30/19?

threeMBs

First of all, what size do you have (or are planning) for the front? I assume its 245/35-19? If so, both above are wrong.

Look here:https://mbworld.org/forums/e-class-w...n-options.html

lyjw88

front would be 235/35/19.
can you explain why both would be wrong..?

amdeutsch

Is easy enough to calculate the diameter of the tires. After all its just simple math.

tarsky68

That's not exactly true.

Actual size from manufacturer to manufacturer varies a little bit, EVEN with the exact same tire size.

However, it is fairly simple, but you have to do your homework. Here's the deal...

Ok, let's say you were looking for a tire in size 235/40ZR19. There are lots of options, but lets look at a Bridgestone RE50A for example:
OD: 26.4"
section width: 9.5"

To make my first point, let's look at another manufacturer for the SAME SIZE tire - Yokahama Advan Sport 235/40ZR19
OD: 26.3"
section width: 9.6"

In this case, they are just minor differences, but you can (and will) find more extreme variances. The Yoko is a little shorter and a little wider than the same sized Bridgestone.

Next point...pairing a staggered set:

Now it gets a little more complicated. Depending on your rim width and offset, you may be able to get a rear tire in something between a 255 and 275 width. You'll have to look at the tire spec pages closely to figure this out. Assuming that your rim and offset will allow a 265 tire, you would then check to see if there was a tire with a 26.4" OD, to match the front.

In this particular case (Bridgestone RE50A), you can get the following:

265/35-19 with a 26.3" OD, or
275/35-19 with a 26.5" OD

In either case, you are within .1" of the same OD as the front. This is what you're looking for. If you take your time and do your research, you will be able to find pairings that match exactly.

So, the bottom line is...it's not a matter of math because from model to model (even from the same manufacturer) and manufacturer to manufacturer, the actual tire sizes vary (even with the same posted tire wall size). All of these companies post the spec's on their websites. The information is there.

I hope this helps

amdeutsch

While I agree with your analogy I would also like to point out that one has to start somewhere. And the sizes picked by the OP can easily be addressed by simple math prior to going in depth.

I've seen sizes from the same manufacturer, but different models, vary in OD as well as tread depth. In addition, the OD will vary depending on rim width. So, to do a list like you did without specifying, comparing rim width is equally as faulty. There are way too many variables. Therefore the easiest is as I stated; simple math. From there one goes further if interested.

threeMBs

tarsky68,

that is correct and that's what I basically said in the link I provided.

lyjw88,

see the link I provided in my first post for sizes that you will require.

235/35-19 is incorrect size for W212 mostly due to lower than required load as well as less than stock diameter - normally when plus sizing you want at least same diameter as stock (245/35-19) or more (255/35-19 which is W212 E63 oem size). Then from front size you derive rear size that would be as close as possibIe to front. As I explained in attached link, it varies from manufacturer to manufacturer, so it is not simple numbers. If you still do not understand what needs to be done, you probably should stay with stock/non-staggered footware.

But if you're set to go with front size of 235/35-19, than rear size would be 265/30-19 or 275/30-19 depending on tire manufacturer. Personally, I would not put 235/35-19 & 265/30-19 on any W212. W203/W208/W209/W204 - yes, maybe even on W207, but not W212.

amdeutsch,

I agree

tarsky68

I think you and I are on the same page