01-15-2021, 10:39 AM | #1 |
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Tires. G80 M3 and G82 M4 - explained, Episode 03
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01-15-2021, 11:05 AM | #2 |
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Interesting, we now have 4 tire manufacturers supplying OE tires for the G8X:
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01-15-2021, 11:41 AM | #3 |
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I like this series it gives us some good info to digest. Kind of surprised how much wider the front tires are in comparison to F80 when seen side by side. I see patching tires in the future of G80 owners.
I think that was Davit Gray which takes on a Bronze/Gold at times? Looks pretty good. |
01-15-2021, 11:42 AM | #4 |
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There you go, clear as can be the tire wall and it’s impact on stability is the reason to size up the rear wheel diameter on the G8X, just as for example CanAutM3 argued and not for increased rear contact patch and stability as for the Porsche where the tire diameter is also upsized.
But wow seeing the F8X front tire next to the G8X really put in perspective how much wider the G8X tire is... Love these videos btw., very to the point. |
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01-15-2021, 11:53 AM | #5 | |
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As I write this, I wonder if we might see equal diameter wheels on the AWD models. Though, I think Porsche uses the unequal sizes on their both their RWD and AWD 911 models. And come to think of it, IIRC, the AWD G8x mules have been using the same wheels as the RWD cars. |
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01-15-2021, 11:55 AM | #6 | |
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01-15-2021, 12:29 PM | #7 | ||
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Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black Last edited by CanAutM3; 01-15-2021 at 12:44 PM.. |
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01-15-2021, 12:39 PM | #8 | |
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As was greatly debated in the wheel diameter thread, I am of the opinion that the end goal of BMW and Porsche are different for using different front and rear wheel diameters. For the G8X, BMW's goal is to vary the tire sidewall height (for all the reasons described in the video) while maintaining tire diameter. For the 992, Porsche's goal is to increase the rear TIRE diameter while keeping the sidewall height relatively constant. As a matter of fact, the rear tires on the 992 have a higher sidewall than the front ones, in opposition to what we see on the G8X.
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01-15-2021, 01:48 PM | #10 |
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Don't think so, they have been evaluating test tires from (at least) 4 tires manufacturers but it does not mean all have been approved. There are also obviously non technical considerations for the final manufacturer selection. I believe only two manufacturers will eventually supply tires for a given front/rear combination. Michelin for sure and my bet would be on Continental for the second (same than for the M2C) .
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01-15-2021, 01:55 PM | #11 | |
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Interesting point on the heat dissipation of the front tire. I recall in the Viper ACR Ring record years ago they had constant issues because the front tire has almost no sidewall. |
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01-15-2021, 02:16 PM | #12 |
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Amen.
My E90 M3 came with Contis. When I swapped to PSSs it completely transformed the car. Same thing with 2x former SUVs, one came with Bridgestone the other with Goodyears, Michelins transformed them as well. Luckily both our current cars came with Michelins. Best tires for the street by far in my experience. |
01-15-2021, 02:20 PM | #13 |
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I really wanted to see the 18" wheels mounted. Yet to see a pic of them.
This car has definitely evolved from the F80. I am very curious how it will all comes together, we need driving reviews ASAP. |
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01-15-2021, 02:22 PM | #14 |
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I'm also looking forward to the reviews!
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01-15-2021, 02:23 PM | #15 | |
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I don't know what magic sauce they put into their tires but they do a good job at it |
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01-15-2021, 03:49 PM | #17 | |
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But I agree, Michelin do have a secret sauce.
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01-15-2021, 04:02 PM | #18 | |
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In my opinion, it is likely to balance the front and rear tread heat to maintain balanced handling as the tires are worked up, especially since the G8X is carrying more weight on the front axle. Quoted from the video just before he talks about the staggered diameters: "It's the balance between front and rear tyres that is essential". It cannot be for absolute heat dissipation because they are offering 3 different front tire aspect ratios:
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01-15-2021, 04:06 PM | #19 | |
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I interpreted "This is the summer version of the full tyre programme that we are now offering on the new M3/M4 models" as that they would all make production.
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01-15-2021, 04:35 PM | #20 |
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To be fair, the video is a bit misleading, showing the tyres in front of another filmed with a fish eye lens. It looks like the G8X tyre is almost 50% wider . If they would have put the F8X tyre in front, it would have been much less impressive. Also, with the 255, they also chose the smallest of the F8X tyre .
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01-15-2021, 04:59 PM | #21 | |
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I have 255s so for me all this extra contact area will be valid |
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01-15-2021, 06:02 PM | #22 | |
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