01-07-2017, 04:01 PM | #23 | ||
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You should be well clear of the outside fender, the next and biggest concern would be the strut. I believe Active Auto's build had BC racing 18x10 et 35 square with a 275/35. In order for them to clear the strut with camber plates they used a 12mm spacer up front and the rear was fine. I believe they ran 2.3-2.5 degrees up front I'm thinking anything in the 10" et 22-24 region is going to be perfect. The higher that offset the lower the chance you have of rubbing the front duct but you'll have a higher chance of running into strut issues. We probably have a 2-5mm margin for error running 19's with a 35 series sidewall. |
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03-04-2017, 12:02 PM | #25 |
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02-20-2018, 04:04 AM | #26 |
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Increasing tire size from 245/265 to 2552/275: any cons ?
hi, I wanna switch from stock to Michelin Pilot Sport Cup 2 for the warm season.
Can I fit a 255/35+275/35 (all 19") set? any issues to be aware of? AFAICS that size is still within the ideal range for the stock 437M wheel sizes: https://tiresize.com/tires/Michelin/...port-Cup-2.htm |
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02-20-2018, 06:26 AM | #27 | |
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02-20-2018, 12:27 PM | #28 |
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Ran those sizes without any problems too.
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02-23-2018, 07:50 PM | #29 | |
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Last edited by M-Supra; 02-23-2018 at 08:01 PM.. |
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02-28-2018, 03:23 PM | #30 | |
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03-01-2018, 10:44 AM | #32 | |
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Is the nannies response adaptive by nature, such as they just are reacting on sensor inputs and that would be generic enough that it works on any wheel/tire? |
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03-02-2018, 11:14 AM | #33 |
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Hey guys,
All vehicles regardless of makes, do develope their electronic measures of cars based on their manufactured spec. LSD, suspension, engine throttle, and other ECU controlled features will be basically working as "what manufacter intended" when you are keeping all things as state as it came. Tire sizes will be one of the component as well. However, remember that a lot of different model vehicles do offer different wheel sizes but they will relatively change their tire sidewall profile so that rolling diameter of vehicle will not differ much. They set about 1 % (or less)of difference of rolling diameter will not alter the driving characteristic of one vehicle and will not give much stress on ECU controls and other physical components. (Same thing goes for AWD, xDrive. If you wish to go with staggered wheels + tires setup front and rear, engineers recommend you to stay within 1 % difference of rolling diameter front and back). If you do go over this 1 % boundary, you could potentially run into "different driving characteristic from what manufacturer initially intended". All makes do spend tons of hours to develop their car and when it comes to sports cars that requires precisely measured values and input, they will spend more time for research to decide what they will do before any vehicle released for sale. But, of course, they are not perfect.. resulting recalls and extensive repairs, etc. Going back to the topic, 245/35/19F + 265/35/19R and 255/35/19F + 275/35/19R does make their different in rolling diameter about 1.07 % front and 1.05 % at the rear. And I would not consider this as "major difference" for ECU control measures and driving dynamics. Cheers |
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03-02-2018, 01:48 PM | #34 | |
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03-02-2018, 03:17 PM | #35 | |
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03-02-2018, 07:39 PM | #36 | |
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03-02-2018, 08:17 PM | #37 |
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Sorry i dont have access to my computer right now. I am at my shop.
I did make some hand writing (sorry my writingis pretty bad) for the same analysis requested. So the difference is 2.22 % between the stock rear roiling diameter to ur intended size spec. But please be aware this calculation only to measure how u will be close to the setting from the manufacturer. Does not mean that u will not enjoy different setting with different tire sizes. Some engineer could argue that 1 % difference is too small to judge the boundary to calculate whether it will give stress to the electronic and mechanical features controlling vehicle driving dynamics. |
03-07-2018, 09:20 AM | #38 |
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I did some calculations/comparisons of balance between front and rear diameters on stock wheels and BMWs own winter wheel setups. The original BMW winter wheels come in two variants, staggered and non staggered. Both with considerably smaller rolling diameters than the stock wheels. And considerable differences in balance front / rear diameters with staggered and non staggered.
So what I got out of my calculations was that the electronic systems in the M2, according to BMW themselves, can handle quite large changes. And how large these changes were okay to be. |
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03-08-2018, 07:16 PM | #39 | |
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However, LSD and transfer case for AWD vehicles will suffer mechanically if change is significant. |
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03-09-2018, 01:47 PM | #41 |
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Apologies for bringing up and old thread. Didn't want to start a new one as this has been discussed extensively.
Anyone here running 255 front 275 here on stock suspension? If so, any noticeable changes or handling dynamics? Any rubbing issues? Dis you prefer the stock wheel sizing? Trying to get as much info before i size up. |
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03-12-2018, 04:53 AM | #42 |
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Just fitted PS4S in 255/275 on stock wheels with stock suspension. No rub or any detrimental effects which is what others have mentioned. I guarantee the green Michelins have more grip than the Contis they replaced which were still very legal. Good riddance to bad rubbish as my Gran would say!
Edit: I bought the tyres online and one of the approved fitting stations was a local BMW dealer though not the one I bought the car from. When I picked up the car the service rep said you do know these are bigger than standard and I said yes, I ordered them that size. No other comment. The invoice has written: "TYRES FITTED TO VEHICLE LARGER THAN ORIGINALLY EQUIPPED. ****** BMW CANNOT BE HELD LIABLE FOR ANY DEVIATIONS IN DISPLAYED SPEED, ABS, OR DSC OPERATION." Arse covering much. Wonder what they would have done if I went 275/30 and 295/30 as others on here have done? Last edited by Doji desu; 03-12-2018 at 06:09 PM.. |
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03-23-2018, 01:51 PM | #44 | |
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Will be fitting them on next Sat with Ohlins R&T and GC Camberplates. |
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