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Old 11-04-2019, 12:47 PM
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Winter Setup 255/55/18 to 235/55/18

My winter setup tires Blizzak 255/55/18 have no life left, and I have a set of 235/55/18 Blizzaks from another car that are in great shape. I was just curious if anyone might have ran this size on the X5 and if there were any issues? I nw that there will be a .9% difference in the speedo, 30mph to 30.92mph which isn't a big deal to me. I'm just worried about the way they will look in the wheel well, and handling with the slightly more narrow tires. Still have to check on my winter rims, as I do not remember the width.
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Old 11-04-2019, 01:06 PM
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I'd ensure that the load and speed rating is appropriate for the X5. Second, I'd ensure that the new tires can be installed safely on the wheel that you'll be using, that is, 255 to 235 may have different wheel width requirements. Other than that, I have no advice.
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Old 11-04-2019, 01:17 PM
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What are those tire/ wheels off of? Check their weight loading, especially if you do any hauling. Know that 20mm less rubber on the ground DOES make a difference, especially when it comes to a 5000lbs SUV trying to corner or haul to an emergency stop. It'll cut through snow ever so slightly better, but probably not enough that you'd ever notice. your slush handling would likely improve marginally also, but your road handling could be fairly significantly reduced.

Personally, I wouldn't run 235's on my X5. Mine came with 255's, and that's the thinnest factory spec tire. I'm not saying that there would guaranteed have any issue, but having even less rubber on the ground to stop this thing wouldn't make me feel great.
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Old 11-04-2019, 04:08 PM
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They’ll be fine.

I run 235/60/18 blizzaks. They just feel a lot softer than 20” tires so handing will be compromises so I just take turns slower. Also, I have a spare in the trunk when I run the winters.
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