04-18-2019, 02:20 PM | #23 | |
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Wife's Car: 2020 X4M Competition, Alpine White on Black Alcantara and Biege
Current Car: 2018 F80 M3CS, SMB, DCT, ZEC, MPE Recently Departed: 2020 F87 M2C, LBB, ZEC, 6MT (Euro Delivery Aug. 29, 2019, totaled by an idiot in a Camry who then ran from the scene) Wife's Prior Car: 2018 F80 M3, Yas Marina Blue, DCT, Black 19s, Carbon Structure Anthracite Cloth/Leather Combination, Driving Assistance Package (Euro Delivery Oct. 9, 2017) |
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04-18-2019, 04:32 PM | #24 | |
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Are you saying the OE (factory fit) tyre is different from any available retail, therefore you can never buy the same tyre again?? What possible benefit would that give either BMW or the tyre manufacturer? Re terminology, an OEM (original equipment manufacturer) is the tyre or part manufacturer, BMW isn't an OEM. OE parts are those fitted by BMW at build. |
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04-18-2019, 05:24 PM | #25 | |
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You can buy the OEM version, that's what the BMW * is for and Porsche N spec, etc. I guarantee the M2 version isn't any different from the M3 version though. |
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04-18-2019, 09:37 PM | #26 | |
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I worked in the tire industry as a predictive analysis(VD) software engineer. I sat in on weekly drive sessions, design planning meetings and went back and forth with manufacturing plants to build the right tire. I've seen it all from benchmark selection, to predictive analysis to tire builds to test sessions to final production and post production monitoring. The same PSS can go on any vehicle but the OE PSS has a unique tread compound, unique internal construction and a different tread pattern. You won't be able to spot the difference in tread pattern because the design is similar but the should widths will be different, the pitch will be different and the groove widths will he different...as well as sipes. You don't hit OE targets on a replacement tire, you just don't. The RR targets were ever increasing on every OE program. Go to the store and pull a PSS in the same size, pull your measurement tape and start measuring the pitch sequence, block widths and groove widths, you'll be surprised relative to your OE tire. If you really wanna go pro, cut the tire into section widths and then compared apex lengths, ply angles, ply lengths, sidewall lengths, should cap endings, and breaker angles. Careful tho, most Michelin tires are built on a CMM and have a huge single bead which can be a huge PITA unless your bandsaw isn't a POS You can always buy the same OE tire, just check the DOT code. Eh we referred to them as OEMs and OEs interchangeably. |
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04-18-2019, 10:34 PM | #27 |
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Get Camber plates!
If you run enough Neg camber up front you can run a 275/35/19 square setup for track days and street if you like. I've autocrossed on both the current RE71R's and the BFG Rival 1.5's in a MX5 Club Brembo. On the street the RE71R's are wicked loud, and over tar strips make squishy sounds as well. They wear fast, but are easier to drive at the limit than the Rivals... As for the Rivals they only come in 275/35 and 305/30 sizes right now for the M2C. Love these tires, they wear much better than the Bridge's and are sooo much quieter than them as well. These are the fastest tires in all the street tire SCCA classes autocrossing again this year. Both these tires are substantially faster than any of the Michelin street tires. I run around 3.5 neg camber front on my toys and about 2.3-2.4 in the rears...
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04-19-2019, 03:29 AM | #28 | |
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Funny how when a car like a lambo has a tyre developed for it then its a big thing and is played up. But BMW never mention tyre development like that. Seems odd they would go to such lengths / costs and not mention it? |
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04-19-2019, 05:14 AM | #29 | |
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04-19-2019, 05:46 AM | #30 |
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The M2C tyres front and rear exact BMW part numbers (starred OE Mich PSS) on real OEM are also specified on E82 M coupe, F87 (m2 and lci and m2c) and E90, E92, E93 M3s.... ?!?
Doesn't seem m2 specific? |
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04-19-2019, 03:41 PM | #31 | |
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I'm a bit curious to see if they're the same on the M3/M4. Just reached out to my ex colleague that now works at Michelin to find out. |
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04-19-2019, 05:36 PM | #32 |
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I searched M2 Competition on Tire Rack. They do sell a Michelin Sport Cup 2 that is listed as a BMW M2 specific tire. In the MPSS category they list BMW * rating in M2 standard size. They also list a BMW * rating for the MPSS tire in 255/35 and 275/35 which is the M3/M4 tire size. It seems the * rating is more of a generic BMW spec rather than being model specific??
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04-19-2019, 06:16 PM | #33 | |
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Even upped the rear width to 295, which improved traction.
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04-20-2019, 04:41 AM | #34 | |
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04-20-2019, 07:54 AM | #35 | ||
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04-20-2019, 09:28 AM | #36 |
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There is no specific or * PSS or PS4S for the M2. It's off the shelf. Heck, on the OG M2, half the guys got Conti’s the other half got Michelin based purely on availability, not performance or design.
Having run PSS, PS4S, Conti’s, 71R, R888R, Trofeo R, Falken’s, and R7’s, the PS4S for the street and 71R’s for the track are my go to. PS4S is better than the PSS in the cold/wet and lasts longer, and you can’t beat the cost/performance value of the 71R for the track. If you want something quicker, R7. If you want something with a little less grip than the 71R, but better road manners, Trofeo R. Last edited by ZM2; 04-20-2019 at 09:53 AM.. |
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04-20-2019, 01:20 PM | #37 | |
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04-20-2019, 03:16 PM | #38 |
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Nice, I hadn’t seen this video!
I forgot to mention the better comfort from the 4S vs the PSS, as well. And, I’ve picked up on the at limit feedback loss on track, altho, ultimate dry grip is still better than the PSS. That said, the 4S isn’t much of a track tire, as it still gets greasy once it’s hot (it does better than the PSS in this regard), so I never notice the feedback limit loss on the street, as I save that kind of driving for the track. And, I’m usually on 71R’s on track—4S when I’m not able to bring track tires for whatever reason. To have all these pluses and significantly longer life than its competitors like Conti’s is pretty incredible. My 2-yr old 4S set has seen 20k street miles and 6 or so track days. The rears are about done (lots of burn outs! ), but the fronts still have 1/4 life left. Last edited by ZM2; 04-20-2019 at 03:23 PM.. |
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04-21-2019, 03:24 PM | #39 |
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I'm selling my M2C Michelin PSS if you are interested. Got the all-season tires so no longer need these. They have less than 10 miles on them straight from the factory. Only thing is they are in St. Louis, MO
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04-22-2019, 11:09 PM | #40 | |
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People on this forum may not care but I can tell you that OEMs care a whole lot about rolling resistance. They squeeze every ounce of mpg out of every supplier and tires get the brunt of it. When I was on the corvette program I was dumbfounded how much effort we spent squeezing marginal amounts of RR out of the tire while maintaining the rest of the performance spider chart. You can fit the same size tire on any vehicle that supports it. It may just be amazing on that car or it could be a total flop, it all depends on what the designers were doing. One thing for sure, Michelin is head and shoulders crushing the competition...but that's no surprise, their engineering budget was 3x of GY. Michelin, unlike some of the noob 3rd tier companies like Toyo and Falken, has the technology to build all around amazing tires. Any moron designer can make an amazing wet handling tire or a tire with amazing rolling resistance or wear, but very few companies have the capabilities to nail a majority of the necessary metrics that consumers expect these days. Some performance characteristics go hand in hand like RR and treadwear because of the low compound hysterisis. The challenge is how do you achieve amazing handling characteristics while maintaining wear and RR? The tread compound is only 1 piece of a huge puzzle. Typically high performance tires will have three tread compounds, with the whole tire having over a dozen different compounds. Then you factor in all the ply and breaker material... OE programs for tire companies aren't always a "profitable venture". One thing we always said was, "there are two brands on the car, the car manufacturer and the tire". It's a huge marketing push to have your tires as OE on a big name brand. Think of it as marketing. That said, these days the OE programs are profitable and the big 4 charge a healthy amount from consumers/OEM. Another thing to keep in mind is that the vehicle manufacturer rarely cares about what tire is on the car as long as it's not some no name brand POS(2nd tier or 3rd tier such as Toyo, Kelly, Firestone, etc). What they care about is TEST drives, magazine reviews, consumer reports(these people are idiots and scammers), tire rack reviews(ditto mostly idiots) and what customers think of the car when they drive it. They want a quiet tire that has a supple ride and can handle like a bat out of hell, they also care that the tire makes it through a 36k mile lease. Most consumers won't say "these tires are shit", instead they'll say "wow this car doesn't handle well" or "this car is loud inside, it doesn't isolate tire noise well" or "bmw put cheap tires that wore out too quickly". Take no offense to this but even enthusiasts don't really understand tires and see them as a commodity, sans tire size. Tire manufacturers fight like hell for OE programs and they have to bring their A game to survive and win future contracts/RFPs. Ok off to get food |
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04-23-2019, 12:56 PM | #41 |
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Blackcircles appear to have stock of the rears...
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05-02-2019, 06:19 PM | #42 |
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Great response from the tyre industry chap thanks.
I had PS4S on my last car and PSS that came on my used M2. The PS4S are phenomenal and will look to replace the PSS when worn but worried they may be TOO grippy to have fun on the rwd M2?! (Last car over 300bhp fwd needed all the grip o could get!) |
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