Hey guys,

I was reading through the forums and couldnt find anyone trying what i want to on our cars

I am planning on running:

19x8.5 ET 45 with 235/35/19 in the front (or maybe 255/35/19)

and

19x10 ET 55 with 275/30/19 in the back


has anyone tried this? would this work?

my concern is that the back wheel may not clear on the inside

 

Interested in this too. I dont know what ET I am but it should be stock. I am running 245 on 9" front, and 265 on 9.5" back, but looking to replace with 275 when the time comes. I have searched around and the answers I'm getting are mixed. 275 seems to work without rubbing or other issue for MOST posters. But its definitely not 100% and seems to vary based on the tire and your car.

If youre looking for an actual answer: I think 275 will be okay, as long as car isn't lowered.

 

I'm on stock suspension so i am pretty sure they would fit but not 100% on this

 

I would also like to know about tire size specifically for the rear. I am running a stock setup and when the rear tires go, i was hoping to replace them with 275. Is there an issue with that.

2012 C63 with Performance Package if that matters

 

there is no issue with running 275 with stock 19x9 wheels.

I am just not sure about 19x10 wheel with 275

 

Ok Cool, sorry to hijack the thread and ask my own question.

 

275 on 9" is probably not good. 275 already exceeds the max recommended size for 9.5", which are rated for between 245 and 265. Otherwise why would people use wider rims if you can just fit wider tires on stock rims anyways?

 

thats strange though because most our stock 9inch wheels have 255 on them so 275 should be no issue for 9.5.

i only say that because i have personally ran 275 on 9 inch rims without any issues. most people just go wider wheels because they want the bigger wheel look etc. but i have seen lots of people run 275 on 9inch wheels and personally they give a nice meatier look (this was on my RS4).

 

Now I am not sure if it matters but I ran a 275 tire size on my G37s and the rear wheel specs show as 19 X 9 rear. Never had any issues and the grip was soo much better, and it looked pretty good too

 

shouldnt matter at all what car it is. im pretty sure 275 will fit and work fine on 9inch. jsut comes down to how it looks on the particular wheel and how it fits on the car.

would really like to see if anyone has ran 275 on a 10inch wide wheel for our cars

 

I mean, if you guys actually have field experience with running 275 on 9", then it clearly works. My info is just from the internets:

inch min desirable max
5,0 155 165 or 175 185
5,5 165 175 or 185 195
6,0 175 185 or 195 205
6,5 185 195 or 205 215
7,0 195 205 or 215 225
7,5 205 215 or 225 235
8,0 215 225 or 235 245
8,5 225 235 or 245 255
9,0 235 245 or 255 265
9,5 245 255 or 265 275
10,0 255 265 or 275 285

 

hmmm interesting!

i guess this answers my question of running 275 on a 10inch wide wheel then!

whered ya find this?

 

That chart was from here:

http://www.tyresizecalculator.com/ch...rim-size-chart

Now I'm playing with a more sophisticated calculator that lets you input a bunch of variables:

https://www.wheel-size.com/calc/




Can anyone confirm that these parameters are close to our stock rear values? 255/30/19 on 9" rims, 50ET? And the clearances are about right?

 

thats almost spot on. ET is 51 I believe

 

Michelin recommended wheel width for 275/30/19 is 9-10. https://www.tirerack.com/tires/tires...4SXL&tab=Sizes

 

that's great. we can all put 275 on our stock rears! Woooo

 

From my personal experience:

Michelin PSS 275/30-19

19x10 ET50 bottomed out against the outer fender lip on lg bumps.

19x10 ET52 solved the problem and looks *perfect* IMO.

So I would say there's no advantage to going ET55 that I can think of.

 

thanks for that info!

i am only going ET 55 because thats what the wheels are in that i wanted.

 

I ran a 19X10 ET +52 with a MPSS 275/30/19 and it rubbed on the right rear outer side on my 2010. The car was lowered on H&R springs. It was just a light rub but a rub all the same. Same wheels on my 2012 rubbed very lightly with MPSS 265/30/19. It was lowered on KW V3 coilovers.

 

19 x 10 ET 52 with MPSS 275/30/19 seems to be the near perfect option and if there is minor outer guard rub a little work on the join generally fixes the problem.

As to rim and tyre size, I had a guy who was for may years the local Michelin race rubber man tell me he considered the 275 on my 10" rim to be a small as he would want to go.

 

I have 275's on mine now and 255 front

 

Something that's often overlooked is the relationship of section width and tread width to wheel width (from Tire Rack):

Tire Specs Explained: Section Width

Section Width

A tire's section width (also called "cross section width") is the measurement of the tire's width from its inner sidewall to its outer sidewall (excluding any protective ribs, decorations or raised letters) at the widest point. This measurement is made without any load placed upon the tire and after the tire has been properly mounted on its industry assigned measuring rim and has been inflated and reset to its test pressure after 24 hours.

Because a tire's section width is influenced by the width of the rim upon which the tire is mounted, the correct industry assigned measuring rim width for the tire size being measured must be used.

The width of a tire mounted on a narrow rim would be "narrower" than if the same tire was mounted on a wide rim.

Note: The overall diameter of a steel belted radial is determined by the steel belts, there is little, if any, change to the overall diameter of the tire due to differences in rim width.

The industry rule of thumb is that for every 1/2" change in rim width, the tire's section width will correspondingly change by approximately 2/10".

For example: a tire in the P205/60R15 size is measured on a 6.0" wide wheel and this size tire has an approved rim width range from 5.5" to 7.5" wide. The tire has a section width of 8.23" (209mm) when mounted on a 6.0" wide wheel. If that tire were mounted on all of the rims within its approved range, the tire's approximate section width would change as follows:

Difference from Measuring Rim

Rim Width Approximate Tire Section Width

0.5" narrower 5.5" 8.03"

Measuring Rim 6.0" 8.23"

0.5" wider 6.5" 8.43"
1.0" wider 7.0" 8.63"
1.5" wider 7.5" 8.83"

Because of the different wheel widths used in the above example, there is a 8/10" projected difference in tire section width when comparing a tire mounted on the narrowest rim to the widest rim within its range. This may affect fenderwell and frame clearances when selecting optional aftermarket wheel and tire packages.

 

I don't know how many times I have written this reply over the years but here goes.
There are tons of sites, 1010 Tire, Tirerack, WillTheyFit that can answer these questions on any car with stock suspension.
All you need is the tire size you are thinking of using, the wheel size in diameter and width and the offset.
If you have changed you suspension another story.
Just don't do what I saw this week.
Do not stetch a tire onto a 10" rim that is not meant to be on a rim more than 8". Besides looking stupid it is dangerous.

 

I'm running 19x10 rear HRE P44SC ET 52
tires 275/30-19 Hankook V12, lowered on Hr's. Looks and rides great. Minor rubs with a load and large bumps.

 

Thank you for the reply. however those calculators do not let you know about car specific clearance. Yes they tell you how much less clearance and extension there is going to be but that doesnt indicate whether the wheels will clear the inside of the wheel well or not. I have used 1010 tire calcs and such a lot, they are great to find out how much the car's wheels will extend or contract


And the reason i am asking whether i can put 275 on a 10" tire is exactly because i dont want to stretch a tire out and have it look weird