shashivr4

.40 X 245 = 98 mm and .35 X 285 = 99.75

.35 X 245 = 85.75 mm and .30 X 285 = 85.5 mm

I know they're very close and well within the 3% tolerance but is it really considered 100% the same rolling diameter? Am I missing something?

CEB

Right. And that is the exact reason why staggered AWD (if not designed for it) is bad. Those are the exact situations where you'll want all of the proper handling characteristics that were designed into the car - along with the proper winter tires.

For winter handling, you'll want the narrowest tires that are the most compliant - so the smallest wheel size with the narrowest tire. For these cars, a 205/55/17 is close to ideal with a outside diameter of 25.88. Technically a 185/60/17 (25.74) would be ideal that that starts looking a bit funky.

shashivr4

Yes, you are indeed correct. I brought up staggered versus non-staggered as I wasn't clear at the time if the potential risk was the actual "widths" being different between the front and rear set-up or if the different widths subsequently making the "overall diameter" different due to wider tires and different sidewall height was the actual concern.

Based on the feedback, it seems the safest way would be to go with a non-staggered set-up (for both handling and to eliminate the diff from frying). Also, seems it may be wise to go with an overall rolling diameter that is very close stock (not sure if this is true or not...but for some reason it would make be sleep better as it would introduce the least amount of variables).

That being said, would it be appropriate to purchase 4 front wheels from the 14 E63 AMG Wagon pictured above for a E350 4Matic?

bigigg

You don't have to go staggered, but it's an option. Like most said, it's for looks. You can definitely purchase staggered wheels/tires with same stock rolling radius, and be within 3% front and rear. Obv your mind is set and staggered on a 4matic scares you, thats fine.. Soo
to answer your question, YES you can use 19" AMG wheels on your car 255/35 front and back, very close to your stock rolling diameter. I believe you currently have 245/40, correct me if i'm wrong. Only thing I cant guarantee is if the offset works, or would look good.. bc I don't know the offsets and don't feel like looking it up. good luck

Pristine

I did not know this. Very informative.
Thanks!

CEB

Hard to say. Do you know the offset of the wheel?

There is another reason for staying close to the OE diameter. Changing the diameter affects not only the speedometer but also the odometer. If the difference is significant, there is a distinct possibility that the manufacturer will determine that there is no way of correctly establishing the actual mileage of your car. That is one of the few ways of actually voiding the entire warranty and your car may have to be re-titled as such.

While many will say "its only 5% (or whatever), let them stop my warranty at 47500 miles", legally any intentional discrepancy is sufficient to void the entire warranty.

It is not very common and nothing that most people need to worry about but there are numerous instances where warranties have been voided for this. Interestingly enough, it is immaterial if the mileage is over or under stated - if the actual mileage cannot be established then the warranty could be toast.

The general rule of thumb is that one should stay within 1% of the OE outside diameter. Mechanical issues with 4matic can crop up beyond 3%.

You should also consider tire wear. A new tire has about 10/32nds tread and is considered worn at 4/32nds and unusable at 2/32nds. That gives you about 6/32nds of wear - or about .1875 of an inch. That amount is generally what manufacturers figure into the allowable variance and that should be your guide when picking a proper tire size

CEB

For years I was always confused about this too. There is this mixture of inches and metric (wheel sizing is one of the few things done worldwide in inches - I can't think of anything else except wheels that are measured in inches (Zoll) in Germany.

There is one time when the aspect ratio may be an important number by itself - and that is when tire stores have different prices for "low profile" tires.

Anything under 55 is considered "low profile". That is important only because as the sidewall gets shorter it gets stiffer making it more difficult to mount tires without using specialized equipment and there is a greater likelihood of wheel damage.

bigigg

CEB

See what you've done now? You've gone and run everybody off.

PeterUbers

Lolol

hyperion667

I have two sets of HRE's in 18 that I used on my 2011 E class 4M .........for sale


I know OP mentioned 19's though, thanx

E350rulz

That being said, would it be appropriate to purchase 4 front wheels from the 14 E63 AMG Wagon pictured above for a E350 4Matic?

Those will run you $8000++ on rims alone. I think they are forged !

xxGenericSNxx

Those rims pictured aren't forged. The forged AMG rims are the twin 5 spoke silver wheels.

Of course it would be most advantageous for the OP to purchase the wheels second hand.

shashivr4

Yeah, would prefer 19s but could you posts some pics of the HREs you're selling?

hyperion667

don't have any readily available.......but I have a set of P43- tint brush clear and another set that is gloss black; R43.....
both 18's, ran 245/40's