[dipaladle]

Hi guys,

I am new to this forum as I just purchased a 2015 M235i convertible (manual ).

I am about to pull the trigger on a staggered set of BMW Style 71 wheels and a combination of Pirelli PZero tires and Michelin Pilot Super Sports. The specs are:

Front Wheels: 18x8 ET47
Front Tires: Michelin PSS 245/35/18

Rear Wheels: 18x8.5 ET50
Rear Tires: Pirelli PZero 255/35/18

Based on everything I have read, these should fit easily without the need for spacers or anything special, right? Looking for confirmation as I am certainly no expert. Thanks!!

[aerobod]

Originally Posted by dipaladle

Hi guys,

I am new to this forum as I just purchased a 2015 M235i convertible (manual ).

I am about to pull the trigger on a staggered set of BMW Style 71 wheels and a combination of Pirelli PZero tires and Michelin Pilot Super Sports. The specs are:

Front Wheels: 18x8 ET47
Front Tires: Michelin PSS 245/35/18

Rear Wheels: 18x8.5 ET50
Rear Tires: Pirelli PZero 255/35/18

Based on everything I have read, these should fit easily without the need for spacers or anything special, right? Looking for confirmation as I am certainly no expert. Thanks!!

Fronts will likely need 10mm spacers to avoid strut tube contact, unless tyre width is reduced to 225/40-18.

[dipaladle]

Originally Posted by aerobod

Fronts will likely need 10mm spacers to avoid strut tube contact, unless tyre width is reduced to 225/40-18.

Thanks for replying. I found a few threads by user XutvJet where he describes having no issues with spacers or anything on a 245/35/18 squared setup, however the wheels he is using are 18x8 ET43 and my fronts would be 18x8 ET47.

Would the difference in ET offset affect anything? I have no idea how this stuff works, so I'm hoping the 4 mm or whatever it is won't cause any problems since XutvJet seemed to have plenty of space and no rubbing.

[aerobod]

Originally Posted by dipaladle

Thanks for replying. I found a few threads by user XutvJet where he describes having no issues with spacers or anything on a 245/35/18 squared setup, however the wheels he is using are 18x8 ET43 and my fronts would be 18x8 ET47.

Would the difference in ET offset affect anything? I have no idea how this stuff works, so I'm hoping the 4 mm or whatever it is won't cause any problems since XutvJet seemed to have plenty of space and no rubbing.

It depends on the tyre sidewall, my winter 225 wide tyres had a sidewall protector that protruded and only left 3mm of clearance to the strut with ET45 18x8 wheels.

[marcthedark]

Originally Posted by dipaladle

Thanks for replying. I found a few threads by user XutvJet where he describes having no issues with spacers or anything on a 245/35/18 squared setup, however the wheels he is using are 18x8 ET43 and my fronts would be 18x8 ET47.

Would the difference in ET offset affect anything? I have no idea how this stuff works, so I'm hoping the 4 mm or whatever it is won't cause any problems since XutvJet seemed to have plenty of space and no rubbing.

The higher the ET number the closer to the strut the wheel sits. The lower the ET number the further away it is. In your case the wheels are 4mm closer to the strut and reducing clearance. Obviously the tire has an effect too as not every 245 tire has the same width. So if you contact the strut you have to install a spacer to move the tire further away from the stru

[Kernel Kurtz]

Probably going to need spacers in the front. Test fit first if you can, then decide how much extra space you need.

Also, just curious why you are mixing tire brands?

[dipaladle]

Originally Posted by marcthedark

The higher the ET number the closer to the strut the wheel sits. The lower the ET number the further away it is. In your case the wheels are 4mm closer to the strut and reducing clearance. Obviously the tire has an effect too as not every 245 tire has the same width. So if you contact the strut you have to install a spacer to move the tire further away from the stru

Thanks. This was very helpful.

[dipaladle]

Originally Posted by Kernel Kurtz

Probably going to need spacers in the front. Test fit first if you can, then decide how much extra space you need.

Also, just curious why you are mixing tire brands?

My plan is to buy some 3mm spacers and some 5mm to see which works better. Hopefully won't need any more than that. Do you have any brands you recommend?

I'm doing the two separate tire brands b/c I found good deals on them in the exact sizes I'm looking for . I figure the rears will need to be replaced sooner than the fronts, so when that time comes I will replace them with MPSS and use them all around going forward.

[dipaladle]

I put them on tonight and think the look killer! No scrubbing at all with 255x35x18 (18x8.5 ET 50) rears and 225x40x18 (18x8 ET47) fronts. Hopefully I will be able to run 245x35's on the front, but it will be tight given the high offset. We will see! Worst case scenario I have to use a small spacer.

The extra grip in the back was immediately noticeable and makes me want a tune even more...

The wheels aren't perfect (clear coat starting to fade, few nicks and a little rash) so I will eventually get them refinished because of how much I like them and how much I think they suit the car. I'm surprised this isn't a "thing" with our cars given the near perfect specs.

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