[DM427]

Some renders of M5 Touring G99 with Rusch forged wheels GTX-R

[Crazy1323]

I think it looks good with 22’s, but I think tire selection is going to limit us to 21’s all around.

[DM427]

Originally Posted by Crazy1323

I think it looks good with 22’s, but I think tire selection is going to limit us to 21’s all around.

for 21/22 tires sizes are 285/35/21 + 295/30/22
for 22 tires sizes are 285/30/22 + 295/30/22

both options are available in tire shops

[HoldenTudiks]

Originally Posted by DM427

Some renders of M5 Touring G99 with Rusch forged wheels GTX-R

Where can I buy these

[iifymbro]

Originally Posted by DM427

for 21/22 tires sizes are 285/35/21 + 295/30/22
for 22 tires sizes are 285/30/22 + 295/30/22

both options are available in tire shops

think it's the weight rating that's the issue but I haven't looked into it at all, this is a big ol' girl after all

[DM427]

Originally Posted by HoldenTudiks

Where can I buy these

www.ruschwheels.com

[DM427]

Originally Posted by iifymbro

think it's the weight rating that's the issue but I haven't looked into it at all, this is a big ol' girl after all

there is no weight issues with 21 or 22 wheels

[Crazy1323]

Originally Posted by DM427

there is no weight issues with 21 or 22 wheels

We are talking about tire load capacity for tires that fit, not the weight of the wheels themselves.

For the two 22” tire sizes you mentioned (285/30/22 and 295/30/22) I could only find the 285’s with a 104 load rating and the 295’s only with a 103 load rating.

The factory tire’s load ratings are 111 in the front and 110 rear. A 111 load rating is 2,403 pounds, but a 104 load rated tire is 1,984 pounds and 103 is only 1,874 pounds.

Running tires with a 103 or 104 load rating on this car does not sound like a good/safe idea at all. Maybe there are some 22” tires that fit with a higher load rating, but I didn’t see them on a quick search.

[DM427]

Originally Posted by Crazy1323

We are talking about tire load capacity for tires that fit, not the weight of the wheels themselves.

For the two 22” tire sizes you mentioned (285/30/22 and 295/30/22) I could only find the 285’s with a 104 load rating and the 295’s only with a 103 load rating.

The factory tire’s load ratings are 111 in the front and 110 rear. A 111 load rating is 2,403 pounds, but a 104 load rated tire is 1,984 pounds and 103 is only 1,874 pounds.

Running tires with a 103 or 104 load rating on this car does not sound like a good/safe idea at all. Maybe there are some 22” tires that fit with a higher load rating, but I didn’t see them on a quick search.

EV vehicles are equipped usually by HL (High Load tires), which have more weight capacity ( usually about 11% more then XL Extra load tires).
For G90 with gross weight (vehicle and payload) weight is 6480lbs (2940kg according official BMW website), so XL tires should work (as there are not many HL tires sizes available )
for example:
Tire Size 285/30R22 101Y
Load Range: XL Load Range. Max. Load= 1,819 lbs
Tire Size 295/30R22 103Y
Load Range: XL Load Range. Max. Load= 1,929 lbs

total these tires can carry 7496lbs, which is enough for 6480lbs vehicle.
This is enough reserve to safely fit the vehicles with the that tire setup according this article: https://www.tirereview.com/science-b...gh-load-tires/

[Crazy1323]

The problem is that each axle does not see the weight of the vehicle equally and is very dynamic, not static.

With vehicle dynamics we often talk about weight transfer. For example, when making a hard left hand turn a lot of weight transfers to the right two tires. Or when you come over a big bump and really load up the suspension the tires feel a much heavier load.

In both of these situations tires will see will loads of well over 25% of the static mass of the vehicle. For example in a .9G turn (which an M5 can do without much trouble) you can see loads about 50% higher on your outside tires. Assuming perfect 50/50 and max weight of 6,480 then each tires “normal” load is 1,620 pounds. Now if you put 50% more weight on the outside tires in a hard turn you are looking at 2,430 pounds per tire on the outside and 810 pounds per tire on the inside, still the same 6,480 in total though.

Personally I would not put a 101 or 103 load rated tire on this car. That tire would be grossly overloaded when considering dynamic loads.

[matowi]

You really don’t want to find yourself in an accident wearing tires not meeting OEM requirements (load, speed rating, even size). That’d be a quick way to get your insurance cover voided

[Crazy1323]

Originally Posted by matowi

You really don’t want to find yourself in an accident wearing tires not meeting OEM requirements (load, speed rating, even size). That’d be a quick way to get your insurance cover voided

Honestly, of those three I’d say load rating may be the most important.

Size isn’t too much of a concern, as long as you are roughly close to stock in outer diameter.

Speed rating becomes important, but if you have a problem where your tires speed rating wasn’t sufficient, you’re liking going at speeds where insurance would find other reasons to give you trouble.

[matowi]

Depends on many factors - including country legislation and specific insurer’s general terms and conditions

My policy states the cover is voided if I have non-OEM spec tires