[spta97]

Originally Posted by Miko M

Done, took me 1/2 hour to do it
Cold only 7F

Brave man, sweet setup!

Looking forward to reading about your impressions.

[aseth]

Great write up!

Is anyone running winter tires on the 21' wheels?

[Shrugged]

Originally Posted by aseth

Great write up!

Is anyone running winter tires on the 21' wheels?

Yep, I’m running the scorpions on the 21” wheels.

[Thewolfbmw]

I am running Scorpions on stock 21's too. Great performance and grip! There is some initial roll when you slam it into a turn but it holds.

[aseth]

Originally Posted by Thewolfbmw

I am running Scorpions on stock 21's too. Great performance and grip! There is some initial roll when you slam it into a turn but it holds.

Mind sharing tire sizes?? Did you go with 265/40 all around?

[Thewolfbmw]

Originally Posted by aseth

Mind sharing tire sizes?? Did you go with 265/40 all around?

No, went with the staggered stock set up. Front - 255 and rears - 265. Though we get some good snow in upstate NY, I could have easily went with 265 front and 295 rear. I know that doesn't follow main stream winter driving sets ups but I ran rear 315 all season on my X5 in many winters with zero handling issues.

[spta97]

Originally Posted by Thewolfbmw

No, went with the staggered stock set up. Front - 255 and rears - 265. Though we get some good snow in upstate NY, I could have easily went with 265 front and 295 rear. I know that doesn't follow main stream winter driving sets ups but I ran rear 315 all season on my X5 in many winters with zero handling issues.

Another member posted an article about narrow not always being better depending what the type of snow/condition (referenced the width of snow shoes).

Interesting read.

It’s possible that narrow would have been slightly better depending on conditions but the type (winter vs summer vs all season) and tread make more of a difference.

I didn’t want to use the OEM wheels as 1) I’ve had less than good luck with shops scratching my wheels and 2) I can do it in my driveway.

I went with the 20” because it was what BMW recommended and was cheaper.

[Shrugged]

Originally Posted by aseth

Mind sharing tire sizes?? Did you go with 265/40 all around?

I was going to go with 255s all around but after placing the order the Discount Tire guy called me back and said that they couldn’t put 255s on the rear for a weight reason. Seems like if they were safe for the front from a weight perspective then they’d also be safe for the rear? I ended up taking his advice and doing 255s up front and 265s rear.

[Miko M]

Originally Posted by spta97

Brave man, sweet setup!

Looking forward to reading about your impressions.

Thanks!

Didn't drive much sense mine work is close buy

One thing I noticed it's much softer ride.

[spta97]

Originally Posted by Shrugged

I was going to go with 255s all around but after placing the order the Discount Tire guy called me back and said that they couldn’t put 255s on the rear for a weight reason. Seems like if they were safe for the front from a weight perspective then they’d also be safe for the rear? I ended up taking his advice and doing 255s up front and 265s rear.

I wonder if the 255 one they had were not the correct load rating?

I seem to recall the scorpions came in different load ratings and we need the higher one.

[Shrugged]

Originally Posted by spta97

I wonder if the 255 one they had were not the correct load rating?

I seem to recall the scorpions came in different load ratings and we need the higher one.

That’s probably a good guess. I just bought them a few weeks ago and it seems like halfway through the winter there aren’t many left in the US (had to have them shipped to MI from Utah and SC). Maybe they couldn’t find the higher rated 255s.

[MrItaly]

Good point about the elevated tire pressure. I tried running them lower in Italy at high speeds, and they were sloppy starting at 120 mph plus. Brought the pressure up, and they stabilized quite well without sacrificing too much comfort around town.

[spta97]

Originally Posted by MrItaly

Good point about the elevated tire pressure. I tried running them lower in Italy at high speeds, and they were sloppy starting at 120 mph plus. Brought the pressure up, and they stabilized quite well without sacrificing too much comfort around town.

I thought about your post when I bumped up the PSI

What are you running them at? And you have a square setup?

For reference I’m at 42 PSI and happy with it. No speeds greater than 80 yet

[MrItaly]

Originally Posted by spta97

I thought about your post when I bumped up the PSI

What are you running them at? And you have a square setup?

For reference I’m at 42 PSI and happy with it. No speeds greater than 80 yet

I'm not square but factory sizes. I have added 15mm spacers since delivery, but that didn't affect stability. It was the psi that was killing me at high speeds (above 120 mph) . I've been without my F97 for a couple of months now as it traversed the Atlantic. I've never experienced it with summers as one factory tire was damaged during factory transport, and I took delivery with the scorpions in the fall. I hope to drag it with the scorpions on the Texas motor speedway west of Dallas next month. If not, cecil dragway in Maryland will follow a couple of months later with the factory Michelens. That is until they break my balls due to a lack of roll cage..... As a certified track, I hear they're quite the stickler for the rules..... Even for amateurs as myself. And this particular F97 is no slouch.