01-15-2021, 10:13 PM | #45 |
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I can't help but think this growth in tyre width between generations is compensation for needing to carry more weight and therefore manage understeer.
It is no doubt going to be a faster car than previous M3/4's on track but is it going to be so at the expense of being an enjoyable road car? I.e. tram lining, aqua planing, being more difficult to park with poor steering feedback? Lotus Elise has 175/55/R16 fronts and 225/45/R17 rears and carries unbelievable corner speed on a track as well as giving great steering feel, a result of its low weight and being mid-engined. Mclaren 720S too has a relatively narrow 245/35/R19 on the front and 305/30/R20 rear and is known for good steering feel as well as having crazy power. Both cars have a philosophy of managing their weight carefully and are on bespoke platforms that enable this goal. By contrast the Camaro ZL1 1LE is a monster with 305 front sections tyres and owners talk about the difficulties as a road car that brings (admittedly its a track car not on a bespoke platform). Big, wide front tyres don't always make a great road car and can bring their own compromises that need to be engineered around. I am looking forward to reviews on the G8x to understand what these trade offs are in the real world as a road car. |
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01-16-2021, 01:31 AM | #46 | |
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01-16-2021, 02:27 AM | #47 | ||
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The F8x was generally seen as slightly wild at launch and BMW tamped it down with software updates over the years and then revised some hardware and released the competition pack. These changes improved the car (I did the iStep update and it certainly reduced the spikey-handling). Reviewers of early cars complained about this "spikey" behaviour in the wet and were more complementary of later models (even none comp models) so it worked. Maybe BMW took an exciting calibration too far for the initial launch and then gently rolled it back? My prediction for the G8x reviews is probably the opposite of what was written for the F8x: "+ new M3 is a much faster machine with nicer interior and tech that grabs more attention... - ...but it's ride and handling limits are too high to enjoy on the road." |
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01-16-2021, 02:49 AM | #48 |
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Oxyde gray definitely for the M3, but I'm not sure that the M4 has the Brooklyn one. Brooklyn seems to have more light blue shades, this is more "rigid" in the colour tint. Looking at it, it seems to be something about "space gray" or something like that, but as it is presented inside a Factory, it's probably only beacause of the fact that the scenario is darker than in the open air.
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01-16-2021, 04:39 AM | #49 |
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Then why M440i with 1820 kilos has 225mm front tire?! Does it means that car will understeer too much?
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01-16-2021, 06:34 AM | #50 | |
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01-16-2021, 06:35 AM | #51 | |
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The lotus and McLaren are mid engined cars and carry a greater proportion of their weight on the rear axle, hence why they can afford skinnier front tires. Their nimbleness is also the result of that rear weight bias. The Camaro has a front weight bias and therefore needs those wide front tires to deal with the weight.
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01-16-2021, 06:37 AM | #52 |
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Yes. Car and Driver reported exactly that, specifying that the M440 had the lowest skidpad number of any PS4S shod car they’ve tested.
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01-16-2021, 06:57 AM | #53 | |
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01-16-2021, 07:55 AM | #55 | ||
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01-16-2021, 07:58 AM | #56 |
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Never knew about the star or what it meant. Does that mean when I replace the tires I need to find not only the same manufacturer and size but also tires with the star. Or do you only get these specific tires when you first purchase?
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01-16-2021, 08:06 AM | #57 | |
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Btw does this mean we should have to ask for bmw specific tires even when we go to mum and pop shops for tire replacement? Or will these tires only be available at dealers... |
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01-16-2021, 08:43 AM | #58 |
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Many times tirerack for example will let you choose the bmw spec tire
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01-16-2021, 09:05 AM | #59 | |
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01-16-2021, 09:23 AM | #60 |
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Yup, most likely that's what was happening
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01-16-2021, 09:47 AM | #62 | ||
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01-16-2021, 09:56 AM | #63 |
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The one on the left is "Individual Special Paint Sepang Bronze metallic" and the one on the right "Skyscraper Grey metallic" according to comments to the youtube video by somebody from M GmbH (Bimmerpost seems to make it difficult to deep-link to it).
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01-16-2021, 10:02 AM | #64 | ||
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Here's a great article on how specific tires are not all the same: https://motoiq.com/not-all-michelin-...ated-the-same/
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01-16-2021, 10:04 AM | #65 | |
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And BTW, OE spec are not necessarily more expensive.
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