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      12-03-2011, 01:13 AM   #1
///M Rakete
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255/35-19 and 285/30-19: Any Rubbing?

This would be on BMW GTS wheels, 19x9 and 19x10. Stock non-ZCP suspension.

I'm pretty sure the answer is "No rubbing." based on reading and searches but I want to be sure before I drop money on the tires.

Thanks
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      12-03-2011, 05:28 AM   #2
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If you've searched then I'm assuming you found this thread:
http://www.m3post.com/forums/showthread.php?t=615025

See post #7 for a picture of zcp/GTS wheels with 255/35 and 285/30 tires. Once winter is over this is the setup I plan to use and I'm hoping by then Michelin will have finally released the PSS in the rear 285/30 size.
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      12-03-2011, 12:04 PM   #3
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Quote:
Originally Posted by ///M Rakete View Post
This would be on BMW GTS wheels, 19x9 and 19x10. Stock non-ZCP suspension.

I'm pretty sure the answer is "No rubbing." based on reading and searches but I want to be sure before I drop money on the tires.

Thanks
By going to a 255/35 tire, you are increasing the front tire diameter by 7mm compared to stock. By going to a 285/30 tire, you are decreasing the rear tire diameter by 14mm compared to stock. That is a 21mm F/R diameter differential change and will affect how your DSC functions to a small degree.

I am staying with the stock 245/35 front size and going to a 285/30 rear. This will give identical F/R tire diameters. I am running 12.5mm spacers on the front and this should offset any increase in understeer caused by increasing the rear tire width while keeping the front the same.

This is on ZCP wheels.
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      12-03-2011, 01:40 PM   #4
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Quote:
Originally Posted by VVG View Post
By going to a 255/35 tire, you are increasing the front tire diameter by 7mm compared to stock. By going to a 285/30 tire, you are decreasing the rear tire diameter by 14mm compared to stock. That is a 21mm F/R diameter differential change and will affect how your DSC functions to a small degree.

I am staying with the stock 245/35 front size and going to a 285/30 rear. This will give identical F/R tire diameters. I am running 12.5mm spacers on the front and this should offset any increase in understeer caused by increasing the rear tire width while keeping the front the same.

This is on ZCP wheels.
Exactly what i did and for that exact reason. As long as the diameter is the same your ride will be smooth. 245/35f and 285/30r on the way to me as we speak.
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      12-03-2011, 02:36 PM   #5
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Thats my car in the pics...a new one for you guys..





The difference in intrusion between the OEM setup and this setup of the DSC is minimal. I have had this setup on the car since the car only had 1200 miles on it. If I felt it was a big deal I would have done away with it...its not that big of a deal. The DSC still lets you still get a little sideways, but if you keep the steering wheel at a good input it will shut you down a tad earlier...not much. Oh, the M3 GTS also has this setup.

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      12-03-2011, 02:37 PM   #6
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Quote:
Originally Posted by merlin00069 View Post
Exactly what i did and for that exact reason. As long as the diameter is the same your ride will be smooth. 245/35f and 285/30r on the way to me as we speak.
To much difference in stagger..the car needs more front rubber.

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      12-03-2011, 06:05 PM   #7
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Quote:
Originally Posted by VVG View Post
By going to a 255/35 tire, you are increasing the front tire diameter by 7mm compared to stock. By going to a 285/30 tire, you are decreasing the rear tire diameter by 14mm compared to stock. That is a 21mm F/R diameter differential change and will affect how your DSC functions to a small degree.

I am staying with the stock 245/35 front size and going to a 285/30 rear. This will give identical F/R tire diameters. I am running 12.5mm spacers on the front and this should offset any increase in understeer caused by increasing the rear tire width while keeping the front the same.

This is on ZCP wheels.
This is true, but you really need to look at the specs for the actual tire you are going to be using. Some tires have pretty large section widths and others aren't that bad relative to the increase in tread width, which can affect whether you're going to rub or not. I'm currently running 255/35 front and 285/35 and I have a bit less than 1" difference in tire diameter between front and rear (RE-11). I think there may be theoretical reasons why the DSC might have it's function affected, but I put 4 and 1/4 track days on this set up (sequential) and I found no effect whatsoever on MDM activation or intervention compared to stock sizes, so I would expect DSC to be similarly affected. Perhaps there might be a few percent difference in activation, but it's not detectable by me.
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      12-03-2011, 08:30 PM   #8
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I'm going to go with P-Zero Corsas, the tire on the GTS. The 255/35 and 285/30 have the same diameter (don't ask me, those are the specs apparently).
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      12-03-2011, 09:39 PM   #9
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Quote:
Originally Posted by ///M Rakete View Post
I'm going to go with P-Zero Corsas, the tire on the GTS. The 255/35 and 285/30 have the same diameter (don't ask me, those are the specs apparently).
Right at 26", my Invos as well as most non Corsas are 26.1" and 25.8"..

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      12-04-2011, 11:21 AM   #10
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Quote:
Originally Posted by VictorH View Post
This is true, but you really need to look at the specs for the actual tire you are going to be using. Some tires have pretty large section widths and others aren't that bad relative to the increase in tread width, which can affect whether you're going to rub or not. I'm currently running 255/35 front and 285/35 and I have a bit less than 1" difference in tire diameter between front and rear (RE-11). I think there may be theoretical reasons why the DSC might have it's function affected, but I put 4 and 1/4 track days on this set up (sequential) and I found no effect whatsoever on MDM activation or intervention compared to stock sizes, so I would expect DSC to be similarly affected. Perhaps there might be a few percent difference in activation, but it's not detectable by me.
What wheels are you running this on?

I was also considering a 285/35 size in the rear because the sidewall and height is better balanced with a 255/35 front tire.

I was hoping to run the re-11's on oem 19s. I currently have re-11 in stock sizes and love them. But they do appear to be a bit stretched and were a son of a bitch to install bc they are so stiff

Any pics of your setup? Id love to see it
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      12-04-2011, 11:55 AM   #11
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Quote:
Originally Posted by KennyPowers View Post
What wheels are you running this on?

I was also considering a 285/35 size in the rear because the sidewall and height is better balanced with a 255/35 front tire.

I was hoping to run the re-11's on oem 19s. I currently have re-11 in stock sizes and love them. But they do appear to be a bit stretched and were a son of a bitch to install bc they are so stiff

Any pics of your setup? Id love to see it
Sorry no pics as I'm running my 220Ms right now (stock size Michelin rubber). But the wheels are the RAC RG 63s which are 19x9 and 19x10 both +22 offset and the RE-11 in 255/35 and rears in 285/35 fit fine and look nice too.
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      12-04-2011, 02:51 PM   #12
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Quote:
Originally Posted by ///M Rakete View Post
I'm going to go with P-Zero Corsas, the tire on the GTS. The 255/35 and 285/30 have the same diameter (don't ask me, those are the specs apparently).
Not true. Here's the math:

245/35/19:

19" wheel = 482.6mm
sidewall = 245 x 0.35 = 85.75mm

total diameter = 482.6 + (85.75 x 2) = 654.1mm

285/30/19:

19" wheel = 482.6mm
sidewall = 285 x 0.30 = 85.5mm

total diameter = 482.6 + (85.5 x 2) = 653.6mm

255/30/19:

19" wheel = 482.6mm
sidewall = 89.25mm

total diameter = 482.6 + (89.25 x 2) = 661.1mm


The 245/35 and 285/30 are within 0.5mm of each other. the 255/30 is 7mm larger.
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      12-04-2011, 03:01 PM   #13
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I'm going to switch from 275/35 to 285/30 as soon as it's available in the Pilot Super Sport. I think that 285/30 is the optimum width for a 10" rim. I like the idea of a slightly smaller diameter. It will give me a hair more torque coming out of the hole.
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      12-04-2011, 05:19 PM   #14
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255/35/19 with 295/30/19 is the ideal setup
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      12-04-2011, 05:20 PM   #15
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Quote:
Originally Posted by tlp View Post
I'm going to switch from 275/35 to 285/30 as soon as it's available in the Pilot Super Sport. I think that 285/30 is the optimum width for a 10" rim. I like the idea of a slightly smaller diameter. It will give me a hair more torque coming out of the hole.
Also the 285/35/19 is to tall, the 285/30/19 looks better as well.
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      12-04-2011, 07:00 PM   #16
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Quote:
Originally Posted by VVG View Post
Not true. Here's the math:

245/35/19:

19" wheel = 482.6mm
sidewall = 245 x 0.35 = 85.75mm

total diameter = 482.6 + (85.75 x 2) = 654.1mm

285/30/19:

19" wheel = 482.6mm
sidewall = 285 x 0.30 = 85.5mm

total diameter = 482.6 + (85.5 x 2) = 653.6mm

255/30/19:

19" wheel = 482.6mm
sidewall = 89.25mm

total diameter = 482.6 + (89.25 x 2) = 661.1mm


The 245/35 and 285/30 are within 0.5mm of each other. the 255/30 is 7mm larger.
Tire manufacturer dimension markings are nominal values. You should always use the manufacturer's actual specifications for a given "size". According to Pirelli the 255/35-19 and 285/30-19 have the same overall outer diameter at 26".
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      12-04-2011, 08:02 PM   #17
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I'd go 265/35/19 fronts, 285/30/19 rears. Pilot Super Sport set-up.

Info - to everyone who doubts, yes they now have 265/35/19 PSS tires. They were released a couple weeks ago.
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      12-05-2011, 05:39 PM   #18
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Quote:
Originally Posted by alms211 View Post
255/35/19 with 295/30/19 is the ideal setup
Agreed, but you will rub ever so slightly with 295's on the stock ZCP wheels. Also, a 295 tire is starting to get heavy, and you really need a lighter wheel to compensate.

The ultimate wheel/tire set up for the M3 is BBS FI with 255/295 Michelin PSS.
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      12-05-2011, 06:24 PM   #19
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Quote:
Originally Posted by VVG View Post
Agreed, but you will rub ever so slightly with 295's on the stock ZCP wheels. Also, a 295 tire is starting to get heavy, and you really need a lighter wheel to compensate.

The ultimate wheel/tire set up for the M3 is BBS FI with 255/295 Michelin PSS.
Stock ZCP's I will take it at face value that they will rub (I don't have them so I do not know). I am on stock suspension and have WedsSport SA55M rims coming tomorrow with Hankook Ventus V12 Evo tires (which are more rounded and not square shouldered) and I was assured that it would not rub. The research I have done indicates the same. The wheels are 9.5 in front with et24 and 10.5 in rear with et24

As far as weight goes....I'll be reducing weight by 6lbs per wheel with WedsSports. Realizing the 295 Hankook rubber will most likely weigh a bit more than the 265 Michelin OEM's.
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      12-06-2011, 07:27 PM   #20
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Quote:
Originally Posted by ///M Rakete View Post
Tire manufacturer dimension markings are nominal values. You should always use the manufacturer's actual specifications for a given "size". According to Pirelli the 255/35-19 and 285/30-19 have the same overall outer diameter at 26".
You really shouldn't go by the "inches" that manufacturers round off to in their specs. It is an approximation. Remember that 0.1" =2.54mm. I have been measuring tires using the real millimeter dimensions for many years now, and you wont go wrong doing it this way, especially when you are looking at tires nearing the limits of proper fitment.

While different tire brands may be slightly different in their real dimensions for a given size, there is consistency within a particular model of tire. So unless you are using one brand of tire up front and a different one in the rear, the measurements should still give you the proper F/R tire sizes relative to each other.
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      12-06-2011, 07:42 PM   #21
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Quote:
Originally Posted by VVG View Post
Agreed, but you will rub ever so slightly with 295's on the stock ZCP wheels. Also, a 295 tire is starting to get heavy, and you really need a lighter wheel to compensate.

The ultimate wheel/tire set up for the M3 is BBS FI with 255/295 Michelin PSS.
That's exactly what I'm going with lol.
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      12-06-2011, 08:04 PM   #22
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This is a good guessimator that I use...Sorry if it has been posted already.

http://www.1010tires.com/TireSizeCalculator.asp
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