MO Spec PSS tire question

Fugly M3 · 09-08-2021, 03:31 PM

So my rear tires are about gone at 14k miles. And I've found an insane deal on Michelin PSS 265/35 19 (98Y) MO spec tires...these are the factory fronts from the AMG GTC. Aside from the weight being different and a .1 inch tread width difference, they appear identical in other specs to the star spec BMW OEM rear PSS. Also note that on a 9.5" rim, the michelin site says the section width for each is the same.

Any thoughts on just how different they are? Where does that extra pound in the BMW tire come from...sidewall, compound? It's not the tire protector, checked images online and the Benz tires feature that as well. These PSS on the rear with the star spec on the front...how do we feel about that? They'd only be on for another about 10k miles until the fronts are gone.

Edit...Tire Rack's info chart. Star Spec on top, MO Spec on the bottom.

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chris719 · 09-08-2021, 03:35 PM

Unfortunately, I doubt anyone here could tell. I'm sure it's safe if the load rating is fine, but whether they are better or worse, only Michelin or Mercedes can answer. Maybe if someone has the time to do a really detailed comparison.

Fugly M3 · 09-08-2021, 03:50 PM

Quote:

Originally Posted by chris719

Unfortunately, I doubt anyone here could tell. I'm sure it's safe if the load rating is fine, but whether they are better or worse, only Michelin or Mercedes can answer. Maybe if someone has the time to do a really detailed comparison.

Might have to be me, ha!

CanAutM3 · 09-09-2021, 06:28 AM

I'll repeat here what I replied in the M3/4 section:

The 265/35R19(M0) is a great front tire for the F8X, since it was specifically designed as a front tire for a RWD car with 9" wide front wheels. I used that tire on my 2015 M4 paired with the F10 M5 295/35R19(*) rear tire and it was a great combo.

However, this tire is likely suboptimal as a rear tire. I cannot talk about the specifics of this tire, but my research has taught me that front and rear specific tires have different contruction to generate the dedired behaviour. For example, front tires usually have a rounder contact patch to favor turn-in, response and sttering feedback whereas rear tires have a squarer contact patch for improved longitudinal traction and lateral stability. This difference in contruction is what contributes to the weight difference.

If you really want to stick with the PSS, better stick with the M2 specific BMW star spec one. It's the one optimized for your car.

VisualEcho · 09-09-2021, 07:42 AM

Unless you're a track god you'll likely not notice any difference at all.

Take the deal.

09-08-2021, 03:31 PM	#1
Fugly M3 Major General 5284 Rep 5,203 Posts Drives: 2023 M3CX Join Date: May 2006 Location: SoCal iTrader: (5)	MO Spec PSS tire question So my rear tires are about gone at 14k miles. And I've found an insane deal on Michelin PSS 265/35 19 (98Y) MO spec tires...these are the factory fronts from the AMG GTC. Aside from the weight being different and a .1 inch tread width difference, they appear identical in other specs to the star spec BMW OEM rear PSS. Also note that on a 9.5" rim, the michelin site says the section width for each is the same. Any thoughts on just how different they are? Where does that extra pound in the BMW tire come from...sidewall, compound? It's not the tire protector, checked images online and the Benz tires feature that as well. These PSS on the rear with the star spec on the front...how do we feel about that? They'd only be on for another about 10k miles until the fronts are gone. Edit...Tire Rack's info chart. Star Spec on top, MO Spec on the bottom. __________________ 2024 M4CX M2C PCD M2C Mountain West Roadie M4 Cross Country Roadie 2017 230i ED 2023 G87 Nurburgring Trip Last edited by Fugly M3; 09-08-2021 at 03:52 PM..
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09-08-2021, 03:35 PM	#2
chris719 Major General 7394 Rep 7,340 Posts Drives: '08 M Roadster Join Date: Oct 2007 Location: NJ iTrader: (0)	Unfortunately, I doubt anyone here could tell. I'm sure it's safe if the load rating is fine, but whether they are better or worse, only Michelin or Mercedes can answer. Maybe if someone has the time to do a really detailed comparison.
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09-09-2021, 06:28 AM	#4
CanAutM3 General 21132 Rep 20,742 Posts Drives: 2021 911 turbo Join Date: Jan 2012 Location: Montreal iTrader: (1) Garage List 2022 Audi RS6 [10.00] 2021 Porsche 911 turbo [10.00]	I'll repeat here what I replied in the M3/4 section: The 265/35R19(M0) is a great front tire for the F8X, since it was specifically designed as a front tire for a RWD car with 9" wide front wheels. I used that tire on my 2015 M4 paired with the F10 M5 295/35R19() rear tire and it was a great combo. However, this tire is likely suboptimal as a rear tire. I cannot talk about the specifics of this tire, but my research has taught me that front and rear specific tires have different contruction to generate the dedired behaviour. For example, front tires usually have a rounder contact patch to favor turn-in, response and sttering feedback whereas rear tires have a squarer contact patch for improved longitudinal traction and lateral stability. This difference in contruction is what contributes to the weight difference. If you really want to stick with the PSS, better stick with the M2 specific BMW star spec one. It's the one optimized for your car. __________________ Porsche 911 turbo* 2021 992 GT Silver Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black
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09-09-2021, 07:42 AM	#5
VisualEcho Banned 6643 Rep 4,145 Posts Drives: '18 M2 6MT Join Date: Sep 2019 Location: Missouri iTrader: (1) Garage List 2018 BMW M2 [10.00]	Unless you're a track god you'll likely not notice any difference at all. Take the deal.
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