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      08-17-2020, 08:38 PM   #1
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Size matters- what would you do with this set

All- I just picked up a mint set of BBS CH-R wheels.

The fronts are 19X9 ET 20
Rears are 19X10.5 ET 25

The fronts have a new set of 245/35 MPSS
Rears are stretched and worn 4/32nd 265/35 MPS.

I have a new set of 255/35/19 MPS4s maybe I can use them for the front and buy 275/35/19 rear?

Given this info what would you guys run for tires?

Here they are...
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      08-17-2020, 10:39 PM   #2
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Quote:
Originally Posted by DL335D View Post
All- I just picked up a mint set of BBS CH-R wheels.

The fronts are 19X9 ET 20
Rears are 19X10.5 ET 25

The fronts have a new set of 245/35 MPSS
Rears are stretched and worn 4/32nd 265/35 MPS.

I have a new set of 255/35/19 MPS4s maybe I can use them for the front and buy 275/35/19 rear?

Given this info what would you guys run for tires?

Here they are...
Run 255/35 front and 295/30 rear. You won't regret it.
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      08-17-2020, 11:33 PM   #3
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^^^^ won't 255/35/19 rub with a 9" wheel and 20ET?

My 255/35s rubbed bad with 220Ms and a 15mm spacer.

I'm also hesitant to run a 295 in the rear because of inducing more understeer (I track the car approx 6 times a year) and because I don't like how the blocky sidewall looks.

If 255s work upfront I'm thinking 275/35 or 285/30 for the rear.
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      08-18-2020, 04:33 AM   #4
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255/35 & 275/35 will work fine.
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      08-18-2020, 09:45 AM   #5
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Quote:
Originally Posted by DL335D View Post
^^^^ won't 255/35/19 rub with a 9" wheel and 20ET?

My 255/35s rubbed bad with 220Ms and a 15mm spacer.

I'm also hesitant to run a 295 in the rear because of inducing more understeer (I track the car approx 6 times a year) and because I don't like how the blocky sidewall looks.

If 255s work upfront I'm thinking 275/35 or 285/30 for the rear.
I have the same CH-Rs with the tires sizes I suggested on lightly lowered JRZ suspension. I tracked them extensively last year but bought dedicated track wheels/tires for 2020.

I had no issues but of course do whatever makes you feel best. They're consumables and if you track you'll want to get off 19s anyhow.

Good luck!
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      08-18-2020, 10:48 AM   #6
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^^^^ really good to hear. Your CH-Rs are 19X9 25et?

Looks like your toyo's have the exact same overall diameter as MPS4S.
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      08-18-2020, 03:14 PM   #7
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Quote:
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^^^^ really good to hear. Your CH-Rs are 19X9 25et?

Looks like your toyo's have the exact same overall diameter as MPS4S.
Yes 19x9" et20, and 19x10.5" et 25 in the rear running 255/35, 295/30. Not 100% certain in those offsets but sounds right. No spacers. Run 2 degrees of camber in the front and 1.8 degrees in the rear for the street.

The Proxy4 is all season tire. Pretty garbage to be honest but it keeps me from driving like an asshole on the street.

Run 18" 275/295 on the track.
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      08-19-2020, 10:51 AM   #8
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Almost exactly the same setup as mine. 19x9 o/s 20, 19x10.5 o/s 22 with 255/35 PS4S, 295/30 PS2. I have 5mm spacers on the front. Front is perfect with no rubbing and a slightly stretched look for the tire. Back does have a more square look, and does bottom out on big dips. I have found that the tires create a sudden transition from under to over-steer that can cause severe butt-clenching if not paying attention. Not sure if that is a function of the tire sizes or the tire models being different. To me the optimum size for the rear would be 285/30 on a 19x10.5 - cant wait to wear out the rears so that I can buy new ones!!
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      08-19-2020, 11:04 AM   #9
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Quote:
Originally Posted by hotbmwfan View Post
Almost exactly the same setup as mine. 19x9 o/s 20, 19x10.5 o/s 22 with 255/35 PS4S, 295/30 PS2. I have 5mm spacers on the front. Front is perfect with no rubbing and a slightly stretched look for the tire. Back does have a more square look, and does bottom out on big dips. I have found that the tires create a sudden transition from under to over-steer that can cause severe butt-clenching if not paying attention. Not sure if that is a function of the tire sizes or the tire models being different. To me the optimum size for the rear would be 285/30 on a 19x10.5 - cant wait to wear out the rears so that I can buy new ones!!
I didn't realize they still manufacture the PS2. Are the ages between PS4 and PS2 similar?
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      08-19-2020, 12:56 PM   #10
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Quote:
Originally Posted by hotbmwfan View Post
Almost exactly the same setup as mine. 19x9 o/s 20, 19x10.5 o/s 22 with 255/35 PS4S, 295/30 PS2. I have 5mm spacers on the front. Front is perfect with no rubbing and a slightly stretched look for the tire. Back does have a more square look, and does bottom out on big dips. I have found that the tires create a sudden transition from under to over-steer that can cause severe butt-clenching if not paying attention. Not sure if that is a function of the tire sizes or the tire models being different. To me the optimum size for the rear would be 285/30 on a 19x10.5 - cant wait to wear out the rears so that I can buy new ones!!

Ha...I know all about the "butt-clenching", from when I used to track a Miata with a square set of 225s. Plowing and potential snap oversteer is exactly what I want to avoid with this car.

285/30s look like rubber bands wrapped around the wheels and the F to R ratio doesn't look right due to the 1/2 diameter difference from 255/35s and 295s look like square rubber bands. Not a fan of the squished block look and the understeer and the potential snap oversteer that comes with that ratio.

So given that and after looking at many pics of 285/295/30s I'm thinking 255/35 front 275/35 rear to retain OEM like handling characteristics and a balanced front to rear look. Only thing I don't like is the "stretched" look of 275s on a 10.5 rim.
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      08-19-2020, 01:25 PM   #11
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It's no more stretched than the OEM PS2/ZCP rear setup with 265's on a 10

You'll like it. Watch out for curbs
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      08-19-2020, 02:56 PM   #12
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Quote:
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I didn't realize they still manufacture the PS2. Are the ages between PS4 and PS2 similar?
No, my tire replacement schedule is out of sync - new fronts 2 years ago and new backs 4 years ago. They don't make PS2's anymore.
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      08-19-2020, 02:57 PM   #13
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Quote:
Originally Posted by hotbmwfan View Post
Quote:
Originally Posted by DRLane View Post
I didn't realize they still manufacture the PS2. Are the ages between PS4 and PS2 similar?
No, my tire replacement schedule is out of sync - new fronts 2 years ago and new backs 4 years ago. They don't make PS2's anymore.
Very likely the oversteer culprit. Careful on old tires.
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      08-19-2020, 03:08 PM   #14
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255/35 and 275/35 will maintain stock stagger and a lot of people go with that successfully. If you are concerned about a stretched look with a 275, don't forget that the M3GTS sizes are 19x9 with 255/35 and 19x10 with 285/30. However, don't go to 285/35/19 - definite rubbing.
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      08-19-2020, 07:36 PM   #15
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^^^^ dang...285/30R19s look pretty good on the GTS...
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      08-20-2020, 10:02 AM   #16
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Very tire dependent - 285/30-19 Contis are not anywhere near that beefy on my E63's 9.5" rear wheels.
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      08-20-2020, 05:34 PM   #17
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Very tire dependent - 285/30-19 Contis are not anywhere near that beefy on my E63's 9.5" rear wheels.
Exactly. That "rubber band" look is what I'm looking to avoid. I want the rears to be as beefy as possible, why I'm thinking 275/35/19.
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      09-15-2020, 09:06 PM   #18
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Quote:
Originally Posted by DRLane View Post
Quote:
Originally Posted by DL335D View Post
^^^^ won't 255/35/19 rub with a 9" wheel and 20ET?

My 255/35s rubbed bad with 220Ms and a 15mm spacer.

I'm also hesitant to run a 295 in the rear because of inducing more understeer (I track the car approx 6 times a year) and because I don't like how the blocky sidewall looks.

If 255s work upfront I'm thinking 275/35 or 285/30 for the rear.
I have the same CH-Rs with the tires sizes I suggested on lightly lowered JRZ suspension. I tracked them extensively last year but bought dedicated track wheels/tires for 2020.

I had no issues but of course do whatever makes you feel best. They're consumables and if you track you'll want to get off 19s anyhow.

Good luck!
I just took a look at the clearance and there is less than 1/4" with 245/35/19s. I don't see how 255/35/19s will fit upfront.
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      09-15-2020, 09:55 PM   #19
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Quote:
Originally Posted by DL335D View Post
Quote:
Originally Posted by DRLane View Post
Quote:
Originally Posted by DL335D View Post
^^^^ won't 255/35/19 rub with a 9" wheel and 20ET?

My 255/35s rubbed bad with 220Ms and a 15mm spacer.

I'm also hesitant to run a 295 in the rear because of inducing more understeer (I track the car approx 6 times a year) and because I don't like how the blocky sidewall looks.

If 255s work upfront I'm thinking 275/35 or 285/30 for the rear.
I have the same CH-Rs with the tires sizes I suggested on lightly lowered JRZ suspension. I tracked them extensively last year but bought dedicated track wheels/tires for 2020.

I had no issues but of course do whatever makes you feel best. They're consumables and if you track you'll want to get off 19s anyhow.

Good luck!
I just took a look at the clearance and there is less than 1/4" with 245/35/19s. I don't see how 255/35/19s will fit upfront.
Stock suspension? That's on the 19x9" CHR?

I don't know what to tell ya man, there are 100x folks on this forum with 255/35/19s on the front. That's literally BMW size for the GTS.

Sounds like you went with 245?
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      09-15-2020, 11:02 PM   #20
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^^^^ yes 19x9 et20 CHRs up front. They came with 245/35s and you can see just how close they are from rubbing. And I hear you man, but it sure doesn't look like 255s will fit.

I had 255/35s on my OEM 220m wheels with 15m spacers and they rubbed a lot. I just had the car aligned to factory specs too.
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      09-16-2020, 06:50 AM   #21
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Has the car ever been in an accident up front? Or maybe the fender liner isn't installed/secured properly?

I'm running Apex 9.5x19 ET22 up front with 255/35-19 PS4S and have no issues with rub at all. Rear is 10.5x19 ET22 with 275/35-19 PS4S also with no rub.
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      09-16-2020, 11:38 AM   #22
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No accidents and the liners are installed correctly. 255/35/19 just barely fit with my 220M wheels and no spacers. Don't think anything changed for 2013. I'll attach my alignment specs a little later today.
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