Stock M56S 20x10 Front 20x11 Rear-Widest Tires?

[OhThatGuy]

I've seen a lot of posts regarding stretched tires and lowered cars but what about max contact patch on a stock M56S? Is there a set up that makes 305's work up front and 315's or even 325 series tires work out back on 20" wheels?

[Ilya]

You'll have to use this site to see what the results are:

http://www.rimsntires.com/specspro.jsp

[beachbum718]

This site helps with offset and tire fitment.good luck
http://www.willtheyfit.com/

[DoN_BLaZe34]

Are you planning on running 20x10 and 20x11 on a stock (ie not lowered) M?

[Altered]

The widest I've had on my M was 325/30 in the rear on a 12" rim. I put a 10" wheel on the front but with a 275/35 tire. I can see a 305 fitting the front with a 20x10.5 but the offset can be tricky. My car wouldn't fit 20x10.5 +45 on front but another member's car here did. In the end these cars can easily hold a huge rear tire, but on the front you may have to do some trial and error.

Also remember that if you use a 325 on an 11" wheel that does not maximize the contact patch, a 12" wheel would put more rubber on the ground. As well as a 305 on a 10" wheel, an 11" with a 305 would use more of the available contact patch for that size tire.

[OhThatGuy]

Are you planning on running 20x10 and 20x11 on a stock (ie not lowered) M?

Yes, a bone stock M56 sport.

[OhThatGuy]

Thank you for all the great info. I had feared that an 11" wide wheel might not tuck in out back. To hear that you fit 12's back there is a stoker. What offset did you use? Did they tuck in completely or poke out? I also thought a 10" wide wheel up front was pushing it. If I can spread the 305 series tire across a 10.5" wide front wheel, I'll go that route. How butched up do these M's look with massive meats on them?

The widest I've had on my M was 325/30 in the rear on a 12" rim. I put a 10" wheel on the front but with a 275/35 tire. I can see a 305 fitting the front with a 20x10.5 but the offset can be tricky. My car wouldn't fit 20x10.5 +45 on front but another member's car here did. In the end these cars can easily hold a huge rear tire, but on the front you may have to do some trial and error.

Also remember that if you use a 325 on an 11" wheel that does not maximize the contact patch, a 12" wheel would put more rubber on the ground. As well as a 305 on a 10" wheel, an 11" with a 305 would use more of the available contact patch for that size tire.

[Altered]

Thank you for all the great info. I had feared that an 11" wide wheel might not tuck in out back. To hear that you fit 12's back there is a stoker. What offset did you use? Did they tuck in completely or poke out? I also thought a 10" wide wheel up front was pushing it. If I can spread the 305 series tire across a 10.5" wide front wheel, I'll go that route. How butched up do these M's look with massive meats on them?

If you click the link in my sig there are specs and pics of them installed

[OhThatGuy]

Okay, thanks. Since I won't have a lowered car suck in the wheels, I may go with 11.5" out back and adjust offsets accordingly. What model and trim M did you have those super wide wheels on? Think they'd fit the same on an M56 Sport?

[Altered]

Rears will fit the same on all Y51 M/Qs. The fronts are where you have to do your own research as there are some differences. The AWD cars seem to have a different knuckle than the RWD, and the Sport package front calipers require wheels with more clearance in the spokes. For instance my black wheels require spacers to clear the M56S front brakes.

Regarding rear wheels, if since you prefer to use a wide tire I would suggest these offsets:

+35 for 10" width +40 for 10.5 or 11" width +45 for 11.5 or 12" width

Those will allow the tire to fit nicely in the fender without sticking out, yet keeps the 11.5 and 12" size from being too close to the struts and exhaust hangers. More aggressive offsets (numerically lower) would require smaller tire sizes to fit in the fender which doesn't seem to be what you are looking for.

I'm wondering if you are planning to run autocross with the car.

[OhThatGuy]

Awesome data-I really appreciate it. I'm not running auto cross. I feel like so many 400+ HP cars come woefully under-tired. And, to my eye, they look 1,000 times better sitting on fat tires.

My Charger came with 245's and had over 450 HP. It could have spun them all day long. I ended up putting light forged 10.5" rears and 305's on it and it looked and drove way better.

The fact that these M's can take 12's (dang near the steamroller widths of Vipers & Aventadors!) has me pretty pumped about the car.

Up front I'm leaning towards running the 10" width at 38 offset and probably shoehorning a slightly oversized 305 tire on (can get them cheap from Camaro guys who upgrade) and 11.5" out back with Michelin 315's. They run super wide (something like 13-13.6" in overall width from what I've read). How wide are/ were your 325 Dunlops mounted on those 12's?

[OhThatGuy]

Altered,

If you get a second, could you measure the overall width of your Dunlop 325's? The Goodyear Supercar 305/35/20 tires off of a Camaro ZL1 I carefully measured on a level surface came out to a massive 333mm wide (over 13"!) unmounted. The Michelin 315's may be even wider. I sure hope the 305 series Goodyears fit in my front wheel wells and the Michelin 315's fit in out back (some Michelin 295's measure 13" wide!).

[Altered]

Mounted on the 12" wheels the 325 Dunlops I have measure around 12.5"

Remember, mine are 325/30 20. If you are looking at ZL1 tires they are 305/35 20, which is a substantially taller sidewall than what I'm using. I won't say it can't fit, but I wouldn't use then on the front my car.

[OhThatGuy]

Ah, crap. You're absolutely right about the diameter being off. Thanks for measuring those 325 Dunlops. If the max width rear tire that can be stuffed in and completely tuck under the fender is around 12.25", I'll need to forget any of the wider brands' 305's and 315's. I sense a 10.5" square set up with 295 series Michelins in my future (if I can get them to fit up front).

[Altered]

295/35 20 on a 20x10.5 +45 MIGHT fit the front, once again on my car it would not but member Debonair was able to install a 20x10.5 +45 with a 275/35 on the front of an M56. Being you don't plan to lower the car a front offset such as +40 on a 10.5" might not be the best idea as that may stick a 295 past the fender. The front can be a little tricky to gauge.

What wheels did you use on the SRT?

[OhThatGuy]

On the SRT I used MHT Concourse Monoblocks 20x9.5 in the front and 20x10.5 in the rear. The 305's in the back were 13" wide and hooked up / looked great. I'll probably want to get the same model of wheel for the M56S.

[Altered]

Nice! I found pics of your Charger...looking forward to seeing what you do with the M56S

[OhThatGuy]

Altered – thanks, buddy! I went in and Photoshopped some of your photos with the 12 inch wheels on it to get a really good look at the poke on them. Do you think that you used up all of the room on the suspension side when you have those 12's on there ?

[Altered]

My tire is less than an inch away from the strut, and the only other things to come really close are the muffler mounts on each side. Being my exhaust is aftermarket this may not be the same with OEM mufflers, but the hanger that protrudes through the rubber exhaust mount is very close to the tire when my suspension is loaded. It isn't close enough to touch, so I am not concerned with it. Technically, I could fit a slightly higher offset, MAYBE a +50 without touching, but the way it is now it as close as I'm comfortable with.

A 20x11 +55 with 315/30 20 would fit exactly the same on the suspension side while keeping the outside from protruding at all on stock suspension. I forgot your car doesn't have the lowering springs mine does when I posted the offsets on the 20th. The 20x11 +45 might sit a wide tire further out than you like.

[OhThatGuy]

Altered- you're the man! Thanks for all of the help and the heads up on this 315's. I'm not quite at the point where I can pull the trigger on it but that looks like a great deal. Hey I noticed your license plate in some of the pics. What kind of CAD work do you do?

[Altered]

Not a problem, you're welcome. I used to program a 5 axis machine in a private company, I've moved on but the plates look better than the new "Empire Gold" ones NY has so I keep them.

[OhThatGuy]

I found TSW Batwurst wheels sized 20x10 with a 40 offset that are only 24.5 lbs. I'm going to run them with Goodyear F1 Supercar tires 285/35/20 (11.56" wide) all around. Should cut just over 60 lbs of unsprung weight.

[Altered]

I would say just make sure those wheels clear the brakes before you order them. Also what is your intent with the car? Just wondering because the F1 Supers require being pretty warm to grip well, if you are referring to the same ones that came stock on 2013 GT500s be VERY careful when driving in anything below like 50 Fahrenheit because they aren't sticky at all when cold. I learned that in low 40s lol.

[BlackCat81]

Sounds like Altered got you squared away on rims, and I'll second staying away from supercar F1's. They need a ton of heat to grip well and without it, you might as well drive around on ice skates.

[OhThatGuy]

Good info-thanks. Yeah, Altered is the wheel master and everybody can take notes on the offsets / size info he's provided in this thread. Saves a ton of research and $ too.

If my wheel and tire plan works out and it shaves 60 lbs of unsprung weight off the stock set up, the difference in performance could be quite noticeable. I found an article where they saved 30 lbs of unsprung weight with a wheel swap and the braking and handling improved a lot. They also shaved 1/2 of a second off of the 30-80 mph time. If I'm doubling the weight savings, it should be very noticeable.

Years ago I shaved a ton of weight with a wheel swap on a GS400 going to SSR Competition wheels (some of the lightest around back then) and the thing could hang in roll-on races against the M3's of the day (which should have been able to pull on me).

[Altered]

I just try to help out by sharing the things I've learned from 4 sets of wheels on this car, lol. I'm very interested in seeing what lighter wheels can do, if you combine that with lighter rotors for those Akebono brakes the Sport has, I'm sure you could double the weight savings. Those things are heavy!

[Chief04]

Hello I am new and been reading a few different post but none to really anserw what im looking for!
I have an 2012 Infiniti M37 and i want to put staggered 22's, but was told if i use a 22x10.5 that i will have to make modifcation to the fenders?
i want to do 22x9 on a 245/35/22 with 30 offset and rear 22x10.5 on a 285/25/22 with 42 offset! Open to any suggestions! Thank you