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Old 03-25-2020, 04:27 PM
Vinman9 Vinman9 is offline
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Wheel/Tire size question

I bought a used 2013 X3 28i with Blizzak P245/50R18 snow tires on it, and it came with a spare set of rims/tires. The extra set of tires are worn out P245/55R17, so I want to get tires replaced. Mechanic says that I should not use this tire size since it's not listed on the doorframe. This size was an option for the 2012 X3 28i, but not for my 2013 x3 28i. I looked at tiresize.com and the specs look similar, and I'm thinking that the previous owner had been running with them since they're practically bald, so I'm wondering if it's OK to use these P245/55R17s? Thoughts?
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  #2  
Old 03-25-2020, 05:26 PM
Autoputzer Autoputzer is online now
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The tire widths are the same. The theoretical rolling diameters are almost the same (27.65" for the 18" wheels, 27.61" for the 17" wheels).
If they clear the brakes and have the same offsets and bolt hole patterns, and the rims are the same width, you should be good to go.

It's common for BMW to offer multiple wheel diameters on the same car, and with the same tire widths but with a higher aspect ratio tire. Sometimes, you need the larger wheel offered to fit over optional, larger brakes.

Snow tires often have better selections in higher aspect ratios and smaller wheel diameters. The opposite is true for high-performance tires. You might be better off with performance tires on the 18" rims and snow tires on the 17" rims: better selection of 18" performance tires, better price and selection for the 17" snow tires.

Last edited by Autoputzer; 03-25-2020 at 05:27 PM.
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Old 03-26-2020, 01:30 AM
slowmachine slowmachine is offline
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We live in a rural area, with roads that are frequently in poor condition, so I like to have as much rubber between the pavement and wheel as I can. Our 2011 X3 xDrive28i came from the factory with 8Jx17 ET43 wheels and 245/55-17 tires. 8Jx18 ET43 wheels with 245/50-18 tires were also offered on our model, as well as the 2012 X3. They are completely interchangeable, as long as there are no brake or suspension changes on the 2013 that cause interference with the 17" wheel.

That said, the choice of tires available in 245/55-17 is basically a single brand and model of winter tire (Continental ContiWinterContact TS 810S) and a two brands and models of all-season tire (Bridgestone Dueler H/L 400 RFT and Pirelli Cinturato P7 A/S). We despise the ride and handling of the Bridgestones. These are all run-flat tires. I have not found any conventional tires in this size in North America. As far as I can tell, they are only made for the 2011-2012 X3, and the lack of widespread use makes them relatively expensive. We buy them from the BMW dealer, whose prices are comparable to other vendors. There are many more tire choices in the 18" size, in both conventional and run-flat designs, that are less expensive than this tiny selection of 17" models.

As for the sticker in the driver's door opening, it merely identifies the size of wheels and tires that were installed at the factory. There should be a list of wheel/tire sizes in your owner's manual, and the appropriate pressure settings for each size combination. I would not hesitate to choose from any on that list, with one exception. In earlier models, a smaller size is often listed, on a 1/2" narrower wheel. I have long thought that these are intended for use with winter tires on the sDrive models, where lacking the traction provided by the xDrive system, you would want to be able to fit snow chains or cables on the rear-drive vehicle without interference with the body or suspension components. Other than the M340i, I have never seen an sDrive X3 here in New Hampshire, so I can only speculate on that configuration.
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Old 03-26-2020, 03:41 AM
Vinman9 Vinman9 is offline
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Hi, Thanks for the quick replies! That makes a lot of sense to me. I appreciate your help. :-)
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Old 03-29-2020, 05:54 AM
TEF TEF is offline
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Door-frame stickers are generally specific to what wheels and tires came on that specific vehicle during the manufacturing process. My 535d xdrive sedan, with an upscale appearance package, had 19" wheels with appropriately sized tires and a sticker to match. Other 535d's arrived with 18" wheels and tires. At the same time, some 528i's came with 17-inch wheels and tires. Each had a door-frame sticker for that specific sized wheel/tires combination. Assuming one stays within the parameters for tire diameter and load rating, an x3 can safely use 17, 18, 19 or 20 inch wheels and tires without issue, (no matter the claim of a mechanic). For example, my X3 uses 17" wheels and tires for winter and the OE 18" wheels and tires for the rest of the year.
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Old 03-30-2020, 12:18 PM
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LMC LMC is offline
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Quote:
Originally Posted by Vinman9 View Post
I bought a used 2013 X3 28i with Blizzak P245/50R18 snow tires on it, and it came with a spare set of rims/tires. The extra set of tires are worn out P245/55R17, so I want to get tires replaced. Mechanic says that I should not use this tire size since it's not listed on the doorframe. This size was an option for the 2012 X3 28i, but not for my 2013 x3 28i. I looked at tiresize.com and the specs look similar, and I'm thinking that the previous owner had been running with them since they're practically bald, so I'm wondering if it's OK to use these P245/55R17s? Thoughts?
The above posters have it right: you can put a new set of 245/55R-17s on those rims. Or even a set of 235/60R-17s. The 17s are ideal for winter tire duty and then run the 18s in summer if you want to run two sets. With your current winter 18s, you can also do the opposite -- 17s summer and 18s winter, although that's slightly odd.
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Old 04-06-2020, 06:29 AM
Z4530i Z4530i is offline
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Tirerack.com might help you in finding tire options for your specific model.
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