VW2MB

Hah. You ain't lying my friend lol. I rarely run into em in Dallas. Mostly Q60s and Challenger RTs. No fun. The occasional BMW and Camaro SS but again ...bleh mostly. It is fun to beat them yes but still lol I prefer my luxury cruiser that happens to have a silverback under the hood.

VW2MB

I'll have to figure out how to play with this site. See how you got the numbers you did. Unless it had you input the wheel well measurements

KEY08

Yep, it’s those tools that lead me to know I could add a 15mm spacer on those rear wheels and get it to be flush. I’m on springs and not Airmatic. I am not lowered, it is the stock suspension.
The lower the offset number, the further OUT the wheel will sit. Higher number, sits further in.

One more issue to consider with wide front tires. They may cause the car to tramline or dart around on roads with uneven pavement. My Shelby has 295 on the front and 305 on the rear. Wheels are 10.5 and 11.
i have to keep both hands on the wheel at all times. Just tossing that out. In road racing the wider tire provides more contact patch and grip.

VW2MB

I literally cannot find a way to work this damn site lol how do you come up with the numbers on the side there? The suspension clearance, the fender clearance and all those. Are those what you have to physically take measurements of and input them? Or does it self populate depending on wheel size? I changed the width of the tire and the width of the fender also changed.

Also yeah I know wider tires tend to have that issue. But I'm not putting wider tires in the front. Only the rear now

nota_amg

All were self populated. I only manipulated the numbers to get the interference with my tire and the fender(red lines fender). If you increase the fender clearance, you'll see the red line turn black. You can take true measurements from the car and input them in the boxes, just measure the spaces that are illustrated and input the numbers. Like I said before, I was just using it to show the idea if the difference where the wheels sit in relation to the fender and the wheels giver measurements and offset. Even the scrub angle is adjustable, but I'm not sure what that is on the W212. Probably something you could find by searching the internet though.

VW2MB

Interesting. Everytime I try and play with the left tire, the numbers don't self populate to tell me how much clearance I have. Or are you saying that if I already know the current clearances of my OE wheel that once I input the custom wheel on the right....it'll show me if it rubs or not?

Or is there some way of using math to reverse the measurements of your tire and wheel to come up with stock figures? Especially since we know the stock wheel offset and size..


EDIT: Apologies, didn't scroll all the way to the bottom of the page. The numbers there explain everything. Thanks for your patience. Lol. However my last point may still be valid. By working in reverse could one potentially come up with the stock clearances by using your numbers? Or is that 50mm of suspension clearance just a generic figure

nota_amg

this, exactly. You'll have to measure to see what you have now, input the wheel/tire info, then add the measurements on the left. Then you'll have base measurements of what's going on and be able to check different wheel/tire combo clearances.

VW2MB

Gotcha. Will have to take some measurements today. Even though here in Dallas it's about 40degrees minus the wind-chill smh. Last question, just came across interesting info, when running staggered wheels on the 4Matics, is it the measurements in relation to the front and rear diameter that matter? Or is the the relation to the OE overall diameter? As in, do the new tires have to be within .1 of each other? Or of the OE diameter?

KEY08

Has nothing to do with OE at this point unless you are way off and it affects your speedo.
They need to be as close to zero difference. That will be impossible, but some say 1%, 2% is not a problem. Better to err on the safe side.

VW2MB

So you're saying ...hypothetically speaking, I could put 255s up front...and 305s in the rear as long as clearance wasn't an issue and the overall diameters were within .1-.2 of each other?

nota_amg

That is the general school of thought, yes


Pretty cold here in Austin too...although it did not stop me from building and testing my intake today...wow...I ran 60-130 and it was OVER a second faster. It was about 2° downhill so it was not "certified" but holy crap it pulls up top now. More testing tonight and tomorrow will give me more info to share, but it is looking VERY good as of what I have now. I'll post more tomorrow.

VW2MB

Interesting. Alright well looks like I'll be playing with numbers a bit and I'll post back when I get something.

Ooh that sounds promising. Please do report back with more.

S. Madman

Sorry to bring this back (been only 3 days but).

Anyone here on Airmatic? I want to go with this setup: https://www.fitmentindustries.com/bu...5x4.41%2C5x112

VW2MB

So after doing even more research, I've come to a light conclusion that 255s WILL fit up front on 18s. 255/40/18 to be exact. So in that case 255/35/19 should also since they are the same in width/diameter. Think I've decided to go with 255/35/19 up front and 295/30/19 in the rear. It's not set in stone as I still have yet to measure for exact clearances in the rear, but the fronts have been used on multiple other members' fronts and don't rub at all. Initially thought of going 255/40/18 and 295/35/18 in the rear. But I believe that's listed at 26.0 and 26.1 in the rear. Not sure how that'll play out. Would love to have more meat in the tires though.

Now it's just about which brands to go with on wheels/tires. And also what width to go with. The rears I'm thinking 10" and the fronts probably at 9. Considered sticking with continental as they have some pretty wide tires at the same width. And also to find which offsets cause those tire sizes to work easily. I'll continue to do more research and post back with findings.

VW2MB

Quick question though, does anyone know if the revolutions per mile being a smidge different would matter much? As in, 798front and 800rear. Would there make much of a difference? 26" and 26.1"?
​​​​

nota_amg

all the diffs are open, so it shouldn't be an issue

VW2MB

Alright cool. Would you say there is a hard limit? Hearing and reading a lot of conflicting things. I've heard the .1 argument multiple times and then I've even read no more than 5%

nota_amg

no idea, but mine are off by 0.1 and I don't have any issues

VW2MB

Decided to go with 255/35/19 up front and 295/30/19 in the rear. Sumitomo HTR Z5. Wanted to go continental 5p as they are even wider at the given size, but got a great deal with the sumis. Will be finding wheels but probably sticking with the E63 OE offset for the rear at 52.

VW2MB

Offsets that I'll more than likely be going with are +36-40 in the front at 19x9 and +50-52 in the rear at 19x10. So to combine all the stats. The overall result should look similar to this...pushed the fronts further out than my initial 44 since I'm widening the wheels to 9in. That extra half inch is 12.7mm so theoretically pushing the offset out by about 11-12 should offset that...no pun intended lol

FRONTS
255/35/19
19x9 +37

REARS
295/30/19
19x10 +52

VW2MB

Just to provide an update of sorts. Just got my tires in today. Decided to go with Michelin Pilot Sport 4S. Currently speaking with some wheel vendors to see what offset and wheel options there are. Prefer the +37 F and +52 R. Maybe even +50

VW2MB

Long awaited update. Hopefully this can help someone in the future.

Got Michelin Pilot spot 4s at 255/35/19 for the fronts and 295/30/19 for the rears. Front wheel size is 19x9 @ +38 and the rear is 19x10 @ +48. Perfect fitment all the way around. No rubbing and no scraping. Not contacting anything. The clearance in the front is incredibly close yet with my sport suspension apparently it's enough to keep the car from squatting down on the tires. Rear has about an inch and a half before it touches anything on the inside. Would just be a piece of fender liner anyway. Completely happy with the result I must say. I probably could've went with a 10.5 wheel to be honest and it would've fit. 11 would really be pushing it. The fronts however, I don't see many going wider/larger than that. After getting the tires mounted...I really wish the tires were as wide as they were pre-mount. As the tires can only ever be as wide as the rim really maybe a smidge over until it starts spilling into unsafe territory. Mine has a smidge of bulge which I love! Just, a 12" tire on a 10" wheel doesn't let the tire be as wide as it could be when viewing from the rear. That porsche look is what I was after and I definitely got close. All in all, I'm satisfied and the ride quality is actually smoother yet firmer if that makes any sense. Tires have about a couple hundred miles on them now so they should have the protective coating lifted and be well broken in. Time to really put them to the test.

KEY08

Your photos are really great!

VW2MB

Lmao. Touche'. Will post shortly...

VW2MB

Front left turning clearance

Front left tire clearance

Rear tire clearance


Alot of my pictures wouldn't upload for some reason. Stops at 50% so I'll have to find another way. But these should suffice