03-24-2023, 06:51 PM | #23 | |
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https://tiresize.com/calculator/ For the above example, OEM is 275/40/21 and upsize is 275/45/21. Speed would be 31/62/93 mph when speedometer read 30/60/90 mph. |
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03-24-2023, 07:52 PM | #24 | |
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03-24-2023, 10:38 PM | #25 |
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To have more options, I am considering going square with the 275/40R21 tires all around using the stock 21" rims. It appears those tires will fit the rear rims and would not impact iDrive or the speedometer. I think....
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03-25-2023, 02:43 PM | #26 | |
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03-26-2023, 10:26 AM | #27 | |
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It is easier to swap a wheel set than two sets of tires on one set of wheels. No need to balance, adjust the sensors, etc. Later, you can sell the winter set or keep it for the next vehicle. In the end, it'll be more convenient and cheaper.
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2024 MB S63 on order '18 X5 50i / '16 BMW F10 550xi / '13 BMW F10 535i / '07 BMW E64 630i / '03 BMW E65 745i / '95 BMW E34 540i / '89 BMW E30 M3 |
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03-26-2023, 08:53 PM | #29 |
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Ps4 are not available in a matching staggered size. What sizes are you using?
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03-27-2023, 10:51 AM | #30 |
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Pilot Sport AS4 aren’t available in 275/40R21 315/35R21. I have looked as they are my favorite all season tire and a hell of tire.
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03-27-2023, 02:43 PM | #31 |
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I just looked at what I got again. I got PS AS4 for fronts and PS 4 for the rears. I must have overlooked 4 for all seasons. Lol. My stock P Zero RF is also Summer tires. So I guess I'm OK.
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03-27-2023, 02:47 PM | #32 |
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03-27-2023, 07:27 PM | #33 |
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What makes you think it’s dangerous? It drives fine, rain or shine. I just wanted to get risk of the rf and didn’t want to go with these tires in question. I did overlook and thought they were the same. Imo, as long as you have same for each pair, you should be fine. I helped run a used tires shop in my early years. People had one tire changed all the times. As long as they are the same size, new or good used, they didn’t care. People seemed to be fine. Ideally all tires should be from same product line but I really don’t know how much of a difference one can feel. Any tire expert here?
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03-27-2023, 10:14 PM | #34 | |
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Reselling a car with mixed tires is not as easy, but I can sure see scenarios where the front and rear tires are different. BMW starts with staggered tires which already gives the two axles different traction and driving characteristics. I think this is another creative way to deal with the 21" staggered setup not having a good AS option. |
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03-28-2023, 02:05 AM | #35 | |
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03-28-2023, 12:13 PM | #36 | |
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I'm eager to hear your thoughts and experience with this setup. -Mike |
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03-28-2023, 12:51 PM | #37 | |
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03-28-2023, 01:00 PM | #38 |
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03-28-2023, 02:51 PM | #39 | |
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Also, you will have 3000 less miles per 100k miles of drive on odometer |
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04-02-2023, 10:17 PM | #40 |
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I went with a square 20 inch set up, using the same 275/45 R20 size that are my primary tires. My dealership got me options and I’ve been really happy with the Michelin Alpin 5 snow tires I bought….
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04-04-2023, 02:59 PM | #41 |
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You really want your tires to all be within 2% or you will be putting extra wear on the differentials.
The vehicle (well, all vehicles) are designed to have the same tread on each corner. You probably wouldn't run into an issue unless you were in a bad situation where balance, stopping distance, and cornering grip were reaching the maximum. FWIW, the same tire, one with the BMW star on the sidewall, and one without the star can have different rubber, tread pattern, cord structure...BMW and the tire manufacturer spend a fair amount of time tuning the tires to the vehicle. You may not notice except maybe back-to-back drives, but there will likely be NVH differences, potentially different grip or longevity between what may look like identical tires. That's not to say that a tire in the proper size won't work on the vehicle, but it may not be BMW's idea of optimal. |
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