[mbd23]

2016 228i. Swapped out the run flats. Do I just buy another tire for the trunk or is there a donut/kit. I don't want any repair kit. I want a spare. Thanks.

[overcoil]

http://www.bimmerzone.com/BMW_Perfor...2M235-KIT.html

[Tpeterson]

This is what I bought.

[Sportstick]

Same here!

[jpnh]

335 for a donut spare?!?!?!?!

holy ass raping!!!!

[NVHoo]

There is a cheaper option. Don't know if it has been discussed here before. First, just buying a cheap rim and tire. The bone stock 230 coupe comes with 205/50/17 which is only 2" thicker than the compact spare and will cost you around $150 for the rim and tire. An advantage of a full size spare is there are no speed restriction nor miles restrictions like you get on a compact spare. To get the spare a little narrower, you can go to you local rim store and try smaller rims, like a 16" or 15" to see if they clear the brakes. It is a quick and easy check to do since you can check rim clearance without mounting a tire. For example, if you go with a 16" rim then the tire would be a 195/60 which saves you an extra 1/2" of thickness and some weight. Again, this "almost" full size spare has not operating restrictions. I've done this before and it works great. Another advantage of a regular tire instead of a compact is that you can store stuff in the "well" of the rim whereas a compact spare typically does not have a well. (store the tire in the trunk with the valve stem facing down.) This minimizes loss of trunk space. I've found the tire well very useful for holding groceries and lots of small items on long trips.

[jpnh]

It looks like a full size spare will fit in the trunk without issue

The upside down idea to utilize the backside of the wheel for storage is a great idea......perfect size for a couple of bags of sand for winter

[BEM-S4]

Originally Posted by NVHoo

There is a cheaper option. Don't know if it has been discussed here before. First, just buying a cheap rim and tire. The bone stock 230 coupe comes with 205/50/17 which is only 2" thicker than the compact spare and will cost you around $150 for the rim and tire. An advantage of a full size spare is there are no speed restriction nor miles restrictions like you get on a compact spare. To get the spare a little narrower, you can go to you local rim store and try smaller rims, like a 16" or 15" to see if they clear the brakes. It is a quick and easy check to do since you can check rim clearance without mounting a tire. For example, if you go with a 16" rim then the tire would be a 195/60 which saves you an extra 1/2" of thickness and some weight. Again, this "almost" full size spare has not operating restrictions. I've done this before and it works great. Another advantage of a regular tire instead of a compact is that you can store stuff in the "well" of the rim whereas a compact spare typically does not have a well. (store the tire in the trunk with the valve stem facing down.) This minimizes loss of trunk space. I've found the tire well very useful for holding groceries and lots of small items on long trips.

If you're planning to run summer then winter wheels and tires, an off season one will work fine as a spare. I've done it no issue whatsoever.

[zipstic]

FYI- For those with XDrive these types of spares may not work well. All four tires have to have the same rolling diameter otherwise you'll cause issues with the XDrive system. So depending on the rolling diameter of your tires this could be ok, but it could be very bad for your car too.

[Maynard]

Originally Posted by Sportstick

Same here!

You would greatly improve your safety by looping the webbing through the wheel center to firmly link it to those back cargo loops. In a front end collision that tire will become a missile, easily slipping out of the x-tie to sail forward (seatbacks will only slow it, if you are at 40+). I'd suggest using the extra webbing to go thru center and back to rear loop, then forward to form the x. A bit more cumbersome to take out, but a lot safer.

[augerpro]

DIY: http://www.2addicts.com/forums/showp...7&postcount=12

[mbd23]

I should have said it's xdrive. Does that change any of the suggestions?

[jpnh]

Originally Posted by mbd23

I should have said it's xdrive. Does that change any of the suggestions?

Nope

Square set up works perfectly on xdrive

IIRC you must keep the front and rear wheels within 1% of the circumference of each other or you will tear up the xfer case

[augerpro]

Originally Posted by jpnh

Nope

Square set up works perfectly on xdrive

IIRC you must keep the front and rear wheels within 1% of the circumference of each other or you will tear up the xfer case

The staggered setup is already larger than 1% difference. Considering the rear is smaller and the rear bias will make it smaller still over time, the difference is probably over 2% on higher mileage xdrives.

Is this a problem? I doubt it since the transfer case is made to slip, that's how it works. Almost all the time I would bet. It's not like the transfer case in a pickup.

[jpnh]

Originally Posted by augerpro

The staggered setup is already larger than 1% difference. Considering the rear is smaller and the rear bias will make it smaller still over time, the difference is probably over 2% on higher mileage xdrives.

Is this a problem? I doubt it since the transfer case is made to slip, that's how it works. Almost all the time I would bet. It's not like the transfer case in a pickup.

You're correct

They are 1.2% off f/r (M240 225/40/18 vs 245/35/18)

https://tiresize.com/tyre-size-calculator/

One of the service guys at a dealership I s/w was rather emphatic that the circumpherence be within 1%......

[Sportstick]

Originally Posted by Maynard

You would greatly improve your safety by looping the webbing through the wheel center to firmly link it to those back cargo loops. In a front end collision that tire will become a missile, easily slipping out of the x-tie to sail forward (seatbacks will only slow it, if you are at 40+). I'd suggest using the extra webbing to go thru center and back to rear loop, then forward to form the x. A bit more cumbersome to take out, but a lot safer.

Excellent point! Thank you!

[mbd23]

I'm confused and obviously uninformed. What came on my car (the original run flats), square or staggered?

[augerpro]

You said run flats, so that *should* mean you had the Pirelli P7 all season tires, which come square. If you had the the Michelin PSS summer tires they would have been staggered.

Do you still have the run flats? Could have probably used one as the spare tire, just need to buy a wheel and jack kit.

[mbd23]

I had the Conti run flats. I now have the Michelin AS 3+. I hope the tire shop knew what they were doing. Is it easy for me to find out what the setup is now?