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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > W Speed Rating, etc.



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      07-25-2021, 11:54 AM   #1
SiEgs90
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W Speed Rating, etc.

In the works of buying some tires and found some A/S W speed rated tires. I donít need a W rating, but theyíre not much so I was probably gonna get them. Some questions I had though were, are W tires stiffer than an H? Was wondering if a stiffer tire will help the fact that Iím not running run flats. Theyíre the same load index as my previous ones. Iíve ran non run flats since Iíve had it with no issues though. Just wondering if this tire will be able to handle more. Will an A/S W rated tire have less grip in colder weather? My owners manual has a list of tires and what the air pressure should be for all configurations, but thereís two things Iím not seeing. One thing is Iím not seeing certain tires and load indexes in there that TireRack has listed. TireRack for example says I can roll a 205/55ZR16 91W and also a 205/55R16 94H XL. In the owners manual these size and speed configurations are not listed under tires and their PSI specs. Is this because they feel these tires would never be necessary for this car or that theyíre unsuitable? Perhaps at the time of the manual being put out those configurations werenít available so they werenít listed in the manual? 205/55R16 91H is what Iíve been running for years so I wondered what the pros and cons would be of running these higher speed ratings and higher load indexes.
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      07-26-2021, 06:19 PM   #2
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Load Indices/Speed Rating has no bearing on stiffness or feel of a tire, first of all. You should follow the minimum specifications that your owner's manual dictates. Past that, on the door sill there will be a placard informing you of the factory pressures needed for front and rear tires, in most instances you should follow those guidelines. +/- 2 PSI depending on comfort, use scenarios, and exterior temperatures.
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