[Bee Pee]

Originally Posted by doug_999

yes, that is exactly what I said...

and if you checkout realoem, the tires are not always square - mine, came from BMW as 235/40/18 fronts, and 255/35/18 rears - as noted.

But/and, my point is/was, why put the same size tires on two different sized rims?

Doug,

as far as staggered 18" rims - perhaps its a "one size fits all approach" by BMW for winter wheels for whole F8x range as both 640m and 19" 641m are quoted by Realoem for M2/M3&M4.

According to Realoem - 235/40/18 F&R - suitable for snow chains whereas staggered tyre set 235/40/18 front with wide rear 255/35/18 - NOT suitable for snow chains.

Your set is probably non-snow chain set up - TBH I'd be happy with wider rears and will probably switch to 255/35/18 in the future.....Out of interest what tyre pressures does the plate inside the door jamb quote for 255/35/18 winter tyres ? I ask as my UK car only quotes 18" tyre pressures 235/40/18 F&R.

Cheers

BP

[rich8566]

Originally Posted by Bee Pee

Doug,

as far as staggered 18" rims - perhaps its a "one size fits all approach" by BMW for winter wheels for whole F8x range as both 640m and 19" 641m are quoted by Realoem for M2/M3&M4.

According to Realoem - 235/40/18 F&R - suitable for snow chains whereas staggered tyre set 235/40/18 front with wide rear 255/35/18 - NOT suitable for snow chains.

Your set is probably non-snow chain set up - TBH I'd be happy with wider rears and will probably switch to 255/35/18 in the future.....Out of interest what tyre pressures does the plate inside the door jamb quote for 255/35/18 winter tyres ? I ask as my UK car only quotes 18" tyre pressures 235/40/18 F&R.

Cheers

BP

I just put my snows on my M2 this weekend. I'm running 18x9" wheels all around with 245/40-18 Michelin PA4s at all four corners. I initially put 40 PSI in each tire, but I need to back it down a bit. I'm thinking of running 35 PSI all around.

[Bee Pee]

Originally Posted by rich8566

I just put my snows on my M2 this weekend. I'm running 18x9" wheels all around with 245/40-18 Michelin PA4s at all four corners. I initially put 40 PSI in each tire, but I need to back it down a bit. I'm thinking of running 35 PSI all around.

235/40/18 all round on 8.5"/9" F&R with 32/35psi F&R.

Any photos of yr 18" x 9" winter setup ??

[doug_999]

Originally Posted by Gimmethecash

I only said you could rotate them, it wasn’t my main point.

You asked why put the same size tire on slightly different sized rims, and the answer is to keep the contact patch as small as you reasonably can.

Uh, look, I'm not trying to pick a fight here... but I'm still not following you... let me try this...

Why not put the same size WHEEL on all four corners if you want to keep the contact patch the same? Why would you change the wheel size but keep the tire the same?

or how about this

If you want a square tire setup, put a squire rim/wheel setup on....

Bee Pee - I'll check tomorrow. But/and, I assume it is the exact same.

[Gimmethecash]

Originally Posted by doug_999

Uh, look, I'm not trying to pick a fight here... but I'm still not following you... let me try this...

Why not put the same size WHEEL on all four corners if you want to keep the contact patch the same? Why would you change the wheel size but keep the tire the same?

or how about this

If you want a square tire setup, put a squire rim/wheel setup on....

Bee Pee - I'll check tomorrow. But/and, I assume it is the exact same.

I assumed from the start that the wheel sizes were fixed; i.e. that a square wheel-width set was not an option. Didn’t you say you already had them? In that context (already have 8.5/9 inch wheels), using the same size tire should be best for winter. Given the choice, sure, same size wheel AND tire is a better option.

I am an IT nerd and tend to answer questions very literally (this one was “why put the same size tires on two different sized rims?”) - I was only trying to explain why you would (in the context given). Wasn’t trying to pick a fight either.

[rich8566]

Originally Posted by Bee Pee

235/40/18 all round on 8.5"/9" F&R with 32/35psi F&R.

Any photos of yr 18" x 9" winter setup ??

No - those are the OEM wheels and tires. I can post photos of my winter setup on Saturday.

[hshot_rooke]

Question for you guys, I just sold my winter beater and now am looking at getting winter wheels and tires.

Will be going with 245/40/18 as it appears most winter M2 setups are.
I understand the basics, but the speedo should be fine at that size correct? It keeps the basic diameter of stock so I should be fine correct?

[rich8566]

Originally Posted by hshot_rooke

Question for you guys, I just sold my winter beater and now am looking at getting winter wheels and tires.

Will be going with 245/40/18 as it appears most winter M2 setups are.
I understand the basics, but the speedo should be fine at that size correct? It keeps the basic diameter of stock so I should be fine correct?

I'll have to check the speedo diff with the square snow tires all around. I do note that the rear OEM tires are taller than the front OEM tires, therefore the rear OEMs rotate at about 790 revolutions per mile vs the shorter front OEMs which rotate at about 807 revs per mile.

[hshot_rooke]

Originally Posted by rich8566

I'll have to check the speedo diff with the square snow tires all around. I do note that the rear OEM tires are taller than the front OEM tires, therefore the rear OEMs rotate at about 790 revolutions per mile vs the shorter front OEMs which rotate at about 807 revs per mile.

rich, you're running 245/40/18 correct?

[doug_999]

Originally Posted by hshot_rooke

Question for you guys, I just sold my winter beater and now am looking at getting winter wheels and tires.

Will be going with 245/40/18 as it appears most winter M2 setups are.
I understand the basics, but the speedo should be fine at that size correct? It keeps the basic diameter of stock so I should be fine correct?

That's the size for the M3, not the M2.

check out realoem.com

http://www.realoem.com/bmw/enUS/show...diagId=36_2140

235/40/18 is the square setup size for the M2.

[rich8566]

Originally Posted by hshot_rooke

rich, you're running 245/40/18 correct?

Yes - winter performance snow tires on 18x9" wheels on my 17' M2

[hshot_rooke]

Originally Posted by doug_999

That's the size for the M3, not the M2.

check out realoem.com

http://www.realoem.com/bmw/enUS/show...diagId=36_2140

235/40/18 is the square setup size for the M2.

Thanks Doug!

[metomwhou]

I think i know the answer but....will M2 wheels with winter tires in sizes 235/40 18 fronts and 255/40 18 rears, work on an M4? I have a feeling the fronts might be a little narrow but its a smoking deal.
They are OEM wheels but I don't know the designation/model number. Even if the tires a little too narrow, it would be cheaper for me to pick up this set of wheels and replace the tires with the 255's all around as mentioned elsewhere in this thread.

[doug_999]

Originally Posted by metomwhou

I think i know the answer but....will M2 wheels with winter tires in sizes 235/40 18 fronts and 255/40 18 rears, work on an M4? I have a feeling the fronts might be a little narrow but its a smoking deal.
They are OEM wheels but I don't know the designation/model number. Even if the tires a little too narrow, it would be cheaper for me to pick up this set of wheels and replace the tires with the 255's all around as mentioned elsewhere in this thread.

I will know later this week

[ZPrime]

For what it's worth, on an 18x8 wheel [edit: with appropriate offset - mine are ET29 and running the same on all corners], you can go down to 225/45 for winter without any rubbing. I'm on 225/45 Michelin XIce3.

[M-Azing]

Hey folks! Just picked up (yesterday) LCI BSM M2 with Pirelli Sottozero II tires on replika 437 wheels, same size (staggered 19") as original summer wheels/tires - wondering if I'll have difficulties maneuvering in the snow. Just about everyone on this forum seems to be going with a square 18" set up. Interestingly though Automotive mag fours seasons M2 had the 19" staggered set up and according to the article, it handled just fine. Any thoughts?

[jonahk]

Originally Posted by Kmoore

Hey folks! Just picked up (yesterday) LCI BSM M2 with Pirelli Sottozero II tires on replika 437 wheels, same size (staggered 19") as original summer wheels/tires - wondering if I'll have difficulties maneuvering in the snow. Just about everyone on this forum seems to be going with a square 18" set up. Interestingly though Automotive mag fours seasons M2 had the 19" staggered set up and according to the article, it handled just fine. Any thoughts?

I have a square 19" setup on Blizzak LM32's and have little to no issue in the snow here in MN.

[bsm m2]

Hi guys! I'm new to this and just received confirmation my 2018 BMW M2 arrived. The dealership is willing to put on my winters for me, but wanted to confirm if 245/40r18 on 18x8 ET20 will fit square setup? Will these clear the callipers and not rub on the fenders? Will they stick out?All feedback appreciated as I'm trying to learn everything!

[hshot_rooke]

Originally Posted by M-Azing

Hey folks! Just picked up (yesterday) LCI BSM M2 with Pirelli Sottozero II tires on replika 437 wheels, same size (staggered 19") as original summer wheels/tires - wondering if I'll have difficulties maneuvering in the snow. Just about everyone on this forum seems to be going with a square 18" set up. Interestingly though Automotive mag fours seasons M2 had the 19" staggered set up and according to the article, it handled just fine. Any thoughts?

Hey M-Azing, mind if you PM me where you got your winter setup? I'm in Toronto as well.

[CaptChaos]

Originally Posted by bsm m2

Hi guys! I'm new to this and just received confirmation my 2018 BMW M2 arrived. The dealership is willing to put on my winters for me, but wanted to confirm if 245/40r18 on 18x8 ET20 will fit square setup? Will these clear the callipers and not rub on the fenders? Will they stick out?All feedback appreciated as I'm trying to learn everything!

Congrats on the new car! Only some 18" wheels will clear the brakes so you may have to do a test fit to how they work out.

[rich8566]

Originally Posted by bsm m2

Hi guys! I'm new to this and just received confirmation my 2018 BMW M2 arrived. The dealership is willing to put on my winters for me, but wanted to confirm if 245/40r18 on 18x8 ET20 will fit square setup? Will these clear the callipers and not rub on the fenders? Will they stick out?All feedback appreciated as I'm trying to learn everything!

OEM is ET 29 front and ET40 rear.