[DavyNM]

'24 X1 28i cames with 225/55/18 102H all-season tires. there are basically no good summer tire options for that size here in the US. also don't want to buy new wheels

is it okay to replace them with 235/50/18 101Y summer tires?(such as the Michelin Pilost Sport 4S)

or will that trigger fault codes... or mess up the xDrive or even ABS/DSC system? according to online tire size calculator/comparison tools, the difference will be less than 1mph at 60mph

[BeEmVe]

We run 225/45/R18 Michelin Pilots on our X1 buggy.

Running 235/50/R18 will not be an issue. You lose a bit of sidewall and tire is fatter. As long as all four shoes are the same yer good.

[DavyNM]

Originally Posted by BeEmVe

Wow ... that is surprising as we run 225/55/R18 Michelin Pilots on our X1 buggy. Looks like that size is no longer made. As I say surprising.

Running 235/50/R18 will not be an issue. You lose a bit of sidewall and tire is fatter. But as long as all four shoes are the same yer good.

yeah... size 225/55R18 has a limited selection of higher end tires these days. most are for Subaru and Mitsubishi crossovers.

[jmanB45]

245/50/18 is a closer in diameter to 225/55/18:

[BeEmVe]

I need to correct myself our shoes are 225/45/R18. I have edited my post above.

Originally Posted by jmanB45

245/50/18 is a closer in diameter to 225/55/18:

Except the Pilot does not come in that size. Just a 245/45/R18

[DavyNM]

Originally Posted by jmanB45

245/50/18 is a closer in diameter to 225/55/18:

there are no good performance summer tires(i.e. Michelin Pilot Sport 4s and others) in that size.

also.. the original BMW 18" wheel is 7.5 wide with 225 tires... 235 is okay, but 245 is a little bit too wide.

[tturedraider]

Originally Posted by DavyNM

'24 X1 28i cames with 225/55/18 102H all-season tires. there are basically no good summer tire options for that size here in the US. also don't want to buy new wheels

is it okay to replace them with 235/50/18 101Y summer tires?(such as the Michelin Pilost Sport 4S)

or will that trigger fault codes... or mess up the xDrive or even ABS/DSC system? according to online tire size calculator/comparison tools, the difference will be less than 1mph at 60mph

It will be 100% fine in every way!!! There is no doubt about it!! There will be no xDrive problem, because the size difference isn’t enough to matter and it will be a square setup all the way around.

[bucketfoot]

Originally Posted by DavyNM

also.. the original BMW 18" wheel is 7.5 wide with 225 tires... 235 is okay, but 245 is a little bit too wide.

Yep 7.5" is too narrow to be putting a 245 on. Yes I'd go with a 235/50/18. It's only a 1.4% change in circumference (well under the recommended max of 3%) and there seems to be a decent selection on Tire Rack.