10-15-2020, 08:01 PM | #1 |
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M2 CS Tire Size
I'm disappointed that the rear stock tire are still at 265. Does anyone have insight why BMW has been keeping the tires slim even for the M3 despite all the torque going to the rear wheel. I see all other brands fitting much wider tires stock, which does translate into better ability to put power down at corner exit.
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10-15-2020, 10:50 PM | #2 | |
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10-16-2020, 09:17 AM | #3 |
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I know but that's still not wide enough given the torque specially in the CS which I drive atm. I think the 265 rear tires is why BMW did not increase the torque on the M2CS.
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10-16-2020, 10:05 AM | #4 | |
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10-16-2020, 12:15 PM | #5 |
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This is the exact same stock tire size as my 1M, and I ultimately went with a 255 front / 275 rear set up on the stock wheels. Interestingly, the slightly increased diameter of the tires made the speedometer precisely accurate whenever I do a radar check. From the factory, the speedometer always read a little high. I will probably do the same thing when the time comes to replace the original tires on the CS.
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10-16-2020, 01:13 PM | #6 |
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1. Deals were made for specific tires for this platform.
2. If you think you're guaranteed to get the power to the ground better with a bigger, heavier tire, you're wrong. If you want to get the power down better, lower the pressure, and/or choose a different tire. 3. The 245/265 combo gives the best overall performance for the car, all things considered. Bigger isn't always better. 4. The correct larger size for the car would be 265/30 & 285/30, and the PSS isn't made in 265/30. 5. Tires are cheap, buy bigger ones and figure out what BMW already knows... |
10-16-2020, 02:38 PM | #7 | ||
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See also this overview by forum fellow mToronto: My former M2 and current M2C setup: Michelin PS4S | 255/35 R19 (F) | 275/35 R19 (R) (i.e. 1 size up): Quote:
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10-16-2020, 02:47 PM | #8 | |
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If you look closely at the specs vs OE you'll see that the 255/275/35 combo is heavier, the front is only .1" bigger while the rear is .4" bigger...and both tires are taller. I'll take the lighter set with the factory width difference front-to-rear myself, as I like the playful nature of the car and don't need pothole protection. It's just too bad that Michelin doesn't make the PS4S in the proper upgrade size, which is 265/30 & 285/30. |
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10-18-2020, 05:58 PM | #9 | |
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10-18-2020, 08:53 PM | #10 | |
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Once again, if you're going to do it, do it right; 265/30 & 285/30. |
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10-19-2020, 07:53 AM | #11 | |
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The Cup 2 in the stock sizes have a tread width of 8.7" and 9.5" The PSS in the stock sizes are 8.8" and 9.4" The PS4S in the stocks sizes are 8.6" and 9.6" Moving to the 255-275/35/19 setup, the PS4S are 8.9" and 9.8" For my winter setup with DWS 06s in that size they're 9" and 9.6"
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10-19-2020, 08:35 AM | #12 | |
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10-19-2020, 08:53 AM | #13 | |
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You're telling me?? Check my posts lol |
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10-19-2020, 10:09 AM | #14 | |
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The only spec standard by the US TRA that manufacturers have to meet is section width and diameter; and the procedure for those two measurements is precisely spelled out in the TRA Year Book document. As long as a tire is within the spec range for section width and diameter for a given size, it meets all requirements to be called a tire of that size. Hence "tread width" is totally free of specification requirements in addition to being totally free of any industry standard method of measurement. Therefore the reason why in the extremes of various tires, specifically DOT-R-compound type tires, some crazy things happen, particularly where a tire like the BFG R1 has an observed tread width essentially equal to its section width and therefore rubs where a "normal" same sized tire clears easily. Well, I say normal to include other R-comps of the same size like a Hoosier R6/R7 which has the more typical rounded section width taper to tread face.
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10-20-2020, 12:13 PM | #15 |
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If going one size up bothers you for whatever reason, then keep it stock size (245/35 R19 (F) + 265/35 R19 (R)). It's perfectly OK.
FWIW: here's the setup on my M2C (and IMHO fit for purpose for my use) (no rubbing - no iDrive error messages): Fresh rubber - Front (PS4S - 255/35 R19): Fresh rubber - Rear (PS4S - 275/35 R19): Recently at night somewhere on a calm German Autobahn:
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10-24-2020, 07:38 AM | #16 | |
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Also, the generic dimensions are pretty meaningless as tread width can vary quite significantly between specs even for a given tire size. Tread width is much more important to grip than section width. TireRack use the same methodology to measure tread width on all tires, so it does provide a decent perspective. And yes, a wider tire can offer more grip and the F8X definitely benefits from wider tires. When I first got my 2015 M4, I went for a square 275/35R18 track setup to allow rotation (I had square setups on my E46 and E92). I could not fully leverage the mid range torque of the S55 on corner exit with the 275. I swithed to wider rear wheels to fit 305 rear tires and improved my lap times by well over a second.
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10-24-2020, 07:56 AM | #17 | |||
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I'm certain that BMW had all manner of tires available to them when they were tweaking the car for the best overall performance, and the PSS in 245/265 worked best. It also continues to be the best to this day, just in the form of the revised PS4S. |
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10-24-2020, 08:22 AM | #18 | |
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I think BMW selection is mostly how to achieve an overall compromise between dry grip, wet grip, regulation and fuel consumption/emissions. They indeed have an "infinite" array to chose from as the the tires are specifically developed for the chassis. There is no 265/30R20 because there was no market need for one. If a manufacturer wanted one, Michelin would have made one.
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10-24-2020, 10:14 AM | #19 |
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10-24-2020, 11:53 AM | #20 | |
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And what about the G80 M3 and G82 M4 ? Demo cars sported PSS, PS4S and Pirelli P Zero:
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10-24-2020, 12:16 PM | #21 | |
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Buying a CS I'd sparing for another set of 763M's with some Trofeo R's for Summer, and use the stock wheels with some PS4S for daily driving. I'd also have a 3rd set of 763's in a custom color wearing 888R's just for photography. I mean, if you've got the coin for a CS, why not?? |
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