[8262S]

Originally Posted by Forzanerazzurri

Yeah would be good to know. I'm not a wheel expert maybe one can chime in soon.

I am watching for someone to explain this as well.

I thought the Alpin 5’s were the same size front and rear — I just looked it up and they appear to be. Here they are from an OEM parts supplier. I can’t find the “9,5J” for the rears on this screenshot, but confirmed it last night. I can dig more later.

Very good catch on these differences. I never noticed the “J” and was just focusing on the ET offset.

[MassComp]

The wheels on the 829M set are wider in the rear (9.5), same size tires though....so no wheel rotation from front to rear....

[Ximian]

Absolutely do not buy the OE winter package, it's a terrible tire for real winters with snow and ice. Most of us that bought them in 2021 did it because there were no other options available with the necessary wheel sizes, offsets, etc.

Pilot Alpin 5s are "performance winter" tires which really means they're good when it's wet and cold, but not really cold and icy or cold with a lot of snow. xDrive will mask the traction issue in deep snow, but it will not if you're RWD.

[8262S]

Originally Posted by Ximian

Absolutely do not buy the OE winter package, it's a terrible tire for real winters with snow and ice. Most of us that bought them in 2021 did it because there were no other options available with the necessary wheel sizes, offsets, etc.

Pilot Alpin 5s are "performance winter" tires which really means they're good when it's wet and cold, but not really cold and icy or cold with a lot of snow. xDrive will mask the traction issue in deep snow, but it will not if you're RWD.

I agree. I like the Michelin Xi3 but it’s not available in sizes for the M3.

I am likely going with Vredestein Wintracs.

I mention the 829’s and Alpin 5’s only for the purpose of deciphering the wheels size differences in this discussion. I am not advocating for the Alpin 5’s.

[8262S]

Originally Posted by MassComp

The wheels on the 829M set are wider in the rear (9.5), same size tires though....so no wheel rotation from front to rear....

Attachment 2928990

I was planning on just getting a set of four 19” wheels all of the same width and offset for winter tires. Would this work? Or do I need to exactly copy the specs of the 829’s even though all four tires would be the same size?

How does the interaction work on the 829’s between the offset, wheel width, and the fact that on the OEM 829’s the Alpin 5’s are the same size all around.

Thanks! Very good discussion.

[Ximian]

Originally Posted by 8262S

I was planning on just getting a set of four 19” wheels all of the same width and offset for winter tires. Would this work? Or do I need to exactly copy the specs of the 829’s even though all four tires would be the same size?

How does the interaction work on the 829’s between the offset, wheel width, and the fact that on the OEM 829’s the Alpin 5’s are the same size all around.

Thanks! Very good discussion.

Compared to the front, the rear wheel has to be a tiny bit wider to clear the suspension and brake caliper. The tire can stretch on the rear wheel otherwise you'd have a 275 front and 285 rear.

[MassComp]

Originally Posted by 8262S

I was planning on just getting a set of four 19” wheels all of the same width and offset for winter tires. Would this work?

Yes this would work....going with a complete square set of OEM sized/offset 19" wheels and size tires. Staying with the stock wheel/tire diameter and ensuring the brake calipers clear is what matters most, hence why I would just stick with OEM wheels to minimize problems. Improper offset could lead to rubbing issues, or increased debris being spun up on the body panels.

[8262S]

Originally Posted by Ximian

Compared to the front, the rear wheel has to be a tiny bit wider to clear the suspension and brake caliper. The tire can stretch on the rear wheel otherwise you'd have a 275 front and 285 rear.

Does the width of the tire change the effective offset?

Meaning 20mm from the center of a 9” wheel (4.5” center) is going to be slightly different than 20mm offset from a 9.5” wheel (4.75” center).

And how does that 1/4” difference in offset add clearance for the suspension? Shouldn’t the smaller rear caliper still clear a 9” ET20 wheel?

Argh. Crap. I thought I had my wheel sizes all sorted out.

I thought it was fairly common for members on this board to get four of then same 19” wheel to use for a winter square set up.

Will that work, or cause problems?

Keep in mind that winter tires (at least for me) by definition mean less aggressive driving on dry pavement.

So if I were looking for a set of summer wheels, I would definitely follow factory OEM dimensions to the letter and number.

I do not intend to add spacers to my OEM summer wheels/tires. I am leaving that stock.

[8262S]

Originally Posted by MassComp

Yes this would work....going with a complete square set of OEM sized/offset 19" wheels and size tires. Staying with the stock wheel/tire overall circumference and ensuring the brake calipers clear is what matters most, hence why I would just stick with OEM wheels to minimize problems. Improper offset could lead to rubbing issues, or increased debris being spun up on the body panels.

So you would not endorse using 9” x 19” ET20 wheels all around?

You would suggest getting 9.5” x 19” ET20 for the rear?

I was really hoping to be able to rotate the winter tires front to rear to maximize useful life of those tires.

[8262S]

Originally Posted by MassComp

Yes this would work....going with a complete square set of OEM sized/offset 19" wheels and size tires. Staying with the stock wheel/tire overall circumference and ensuring the brake calipers clear is what matters most, hence why I would just stick with OEM wheels to minimize problems. Improper offset could lead to rubbing issues, or increased debris being spun up on the body panels.

So would you recommend for or against going with a set of four 9” x 19” ET20 all around for winter tires?

Or it is absolutely necessary that the rear wheel is 9.5” wide?

I see people messing with offsets all the time using spacers. I just wonder how much 1/4” will really matter in this winter tire application.

[MassComp]

Originally Posted by 8262S

So would you recommend for or against going with a set of four 9” x 19” ET20 all around for winter tires?

Or it is absolutely necessary that the rear wheel is 9.5” wide?

It's not a recommendation per se, all I'm saying is it would work going with a truly square set of wheels (all the same size & width). Not necessary that the rear wheels need to be 9.5".

May I ask why not just buy the slightly staggered in width 829M Winter wheel set and use as is? Is the main importance here to have the ability to rotate the wheels from front to back? If so, these are Winter tires after all, so you won't be getting the best mileage from them.

If you are concerned when using a square wheel set as to the look of the 9.0" rears being slightly tucked compared to the 9.5" wheels, you could always use spacers in back.

[8262S]

Originally Posted by MassComp

It's not a recommendation per se, all I'm saying is it would work going with a truly square set of wheels (all the same size & width). Not necessary that the rear wheels need to be 9.5".

May I ask why not just buy the slightly staggered in width 829M Winter wheel set and use as is? Is the main importance here to have the ability to rotate the wheels from front to back? If so, these are Winter tires after all, so you won't be getting the best mileage from them.

If you are concerned when using a square wheel set as to the look of the 9.0" rears being slightly tucked compared to the 9.5" wheels, you could always use spacers in back.

Yes, the main reason for 9” wide all the way around is rotating them.

I do not care if the rears look 1/4” more tucked with the winter wheels/tires. Right now I run steelies in the winter so am use to a different look. If that bugs me with nice winter wheels on the M3, your suggestion about adding a small spacer back there to correct to factory spec is a good one.

And I really baby my winter tires. Once they go on the fun gets dialed back substantially. I think I am able to get 3-4 winters out of the Xi3’s (December through March is a season).

Part of the reason the fun gets dialed back is that the winter tires just have so much lower of a limit on dry pavement than summer performance tires. And they feel a bit squishy, so the car doesn’t handle as sharply.

And if we get a March snow storm, I don’t want to be left with thin winter tire tread because I was acting like a hooligan with them. The car will be my DD.

[Ximian]

Originally Posted by 8262S

And how does that 1/4” difference in offset add clearance for the suspension? Shouldn’t the smaller rear caliper still clear a 9” ET20 wheel?

Argh. Crap. I thought I had my wheel sizes all sorted out.

Winter wheel package:
Front: 9,0J x 19" ET 20 mm
Rear: 9,5J x 19" ET 20 mm

826M:
Front: 9,5J x 19" ET 20 mm
Rear: 10,5J x 20" ET 20 mm

I don't really understand why they didn't do 9.5Jx19" ET 20 all around for the winter package. If someone knows, please share.

[MassComp]

Originally Posted by 8262S

Part of the reason the fun gets dialed back is that the winter tires just have so much lower of a limit on dry pavement than summer performance tires. And they feel a bit squishy, so the car doesn’t handle as sharply.

Hence why I will be going with a dedicated stock sized jet black set of 826M wheels with Conti A/S DWS 6 tires for the Winter. The black 826M wheels are about $150 less BTW than the bi-color ones that will be coming with my new M3.

Since my new M3 will also be a DD, not driven in snow storms (I have the ability to work from home those days), and will be on the car for 5 months or more a year, I think I can get away with just A/S tires and hopefully enjoy as much as a stock feel to the car as possible during that time.

Fingers crossed!

[8262S]

Originally Posted by Ximian

Winter wheel package:
Front: 9,0J x 19" ET 20 mm
Rear: 9,5J x 19" ET 20 mm

826M:
Front: 9,5J x 19" ET 20 mm
Rear: 10,5J x 20" ET 20 mm

I don't really understand why they didn't do 9.5Jx19" ET 20 all around for the winter package. If someone knows, please share.

You may have just cracked the code!

Winter wheels could be 9.5J x 19 ET20 all the way around.

But the reality is probably that 9J or 9.5J on all sides probably doesn’t matter as long as they clear the calipers and suspension.

[Ximian]

Originally Posted by 8262S

You may have just cracked the code!

Winter wheels could be 9.5J x 19 ET20 all the way around.

But the reality is probably that 9J or 9.5J on all sides probably doesn’t matter as long as they clear the calipers and suspension.

There's a post somewhere on here that says 9.0Jx19 will not clear the rear. Still doesn't explain the odd sizing for the winter package.

[8262S]

Originally Posted by MassComp

Hence why I will be going with a dedicated stock sized jet black set of 826M wheels with Conti A/S DWS 6 tires for the Winter. The black 826M wheels are about $150 less BTW than the bi-color ones that will be coming with my new M3.

Since my new M3 will also be a DD, not driven in snow storms (I have the ability to work from home those days), and will be on the car for 5 months or more a year, I think I can get away with just A/S tires and hopefully enjoy as much as a stock feel to the car as possible during that time.

Fingers crossed!

Yeah I need to get through the worst storms to make some appointments even though I have work from home flexibility too.

And to be honest, there is enough snow pack on the roads for several days after a storm that all seasons would be too much of a compromise.

I also change the winter wheels myself so literally it sometimes happens at 8:00 pm the night before the first snow. It is much harder predicting when I am safe to take them off in the spring though. Summer tires in even a dusting of snow is really bad news.

[8262S]

Originally Posted by Ximian

There's a post somewhere on here that says 9.0Jx19 will not clear the rear. Still doesn't explain the odd sizing for the winter package.

Well I am considering ordering from LaForge Ind in Singapore. So I have to get it right the first time.

I might just bite the bullet and order 9J front, 9.5J rear and deal with replacing the winter tires sooner than I may prefer.

Although I guess I will see how they wear, perhaps I can just do new fronts although I have always in the past done all four tires at once (but I could always F-R rotate summer and winter tires).

I don’t think any of us are buying M cars to save money on wear items and gas….

[MassComp]

Originally Posted by 8262S

Yeah I need to get through the worst storms to make some appointments even though I have work from home flexibility too.

You do what you have to do of course. Fortunately the plows in my State seem to do a good job overall keeping the roads clear after snow storms. I've been getting away with just A/S tires on my vehicles over the last 10 years or so.

I also change the winter wheels myself so literally it sometimes happens at 8:00 pm the night before the first snow. It is much harder predicting when I am safe to take them off in the spring though. Summer tires in even a dusting of snow is really bad news.

I change out my wheels for the Winter myself as well. And since I don't have a garage, I try to do by 2nd week into October so I can wash the Summer wheels before I store them down in the basement. Usually by middle April the temps during the day are above 50 degrees, so I do the switch over to Summers by then.

[Forzanerazzurri]

So any issues if we run

826M Front: 9,5J x 19" ET 20 mm

x4 all around for winter?

[BaneOfShorty]

I just ordered aftermarket wheels for winter and went 9.5x19 w/22mm offset as a square setup per the recommendation of the guy I worked with at Fitment industries

[8262S]

Originally Posted by BaneOfShorty

I just ordered aftermarket wheels for winter and went 9.5x19 w/22mm offset as a square setup per the recommendation of the guy I worked with at Fitment industries

Thanks.

Why the 22mm offset? Just filling out the wheel wells or function?

I would be very interested in seeing how they look. When will you get them?

Although will you not mount them until the winter?