[zero21]

Since a lot of us want to reduce weight, here's a solid article (not very techy) on ride quality and unsprung mass concerns.

https://www.roadandtrack.com/car-cul...ght-explained/

I believed for the longest it was more important to reduce unsprung mass on heavier cars. Turns out it's the opposite.

[GrannyShiftG80]

So m2 wheels no longer being forged is good for us ?

[Tag]

Unsprug weight still matters. All that article was saying was since cars weigh more the ratio of unsprung weight can also be more. That along with giving the tires more sidewall, which by the way adds more weight, and having better dampening counters the added weight. Any time you reduce unprung weight, no matter how good the car is, it will improve ride comfort and the cars performance. Look at the Z06 with CF wheels, they're so light that if you get the car with the CF wheels the car gets a totally different damper setup to accommodate for them. That's an extreme example since the CF wheels weight a lot less than the standard wheels. If you're getting an M2 with lighter wheels they'll only be a couple of pounds or so less, not enough to retune the suspension, but it's enough to notice the car rides better and handles better.

[zero21]

Originally Posted by Allenssmart

So m2 wheels no longer being forged is good for us ?

Just that there's a balance, and if the ratio stays relatively the same, the ride quality and performance won't suffer as much as we think.

It's absolutely in everyone's interest to reduce unsprung weight. The article just points out that it would be better to also drop weight from the sprung portion so the ratio stays relatively the same for the most performance benefit. The engineers don't give that ratio, but it's worth sharing IMO.

Unsprung/sprung = x, --> (weight reduction program) --> unsprung /sprung = x

[Tag]

Originally Posted by Allenssmart

So m2 wheels no longer being forged is good for us ?

Still can't get over the fact they are using cast wheels on an M car. It's wrong on so many levels. And to top it off they are the same style as the forged ones used on the M3/4. Did they think we wouldn't find out? Just another slap in the face.

[T_U_D]

Originally Posted by Tag

Still can't get over the fact they are using cast wheels on an M car. It's wrong on so many levels. And to top it off they are the same style as the forged ones used on the M3/4. Did they think we wouldn't find out? Just another slap in the face.

It is not the first time this has happened nor will it be the last. The one year only U.S. 2003 E39 540i ‘M Sport’ had forged wheels while the E39 M5 had cast wheels. That was a fairly big slap in the face.

[Albator_IIII]

Originally Posted by Tag

Still can't get over the fact they are using cast wheels on an M car. It's wrong on so many levels. And to top it off they are the same style as the forged ones used on the M3/4. Did they think we wouldn't find out? Just another slap in the face.

Originally Posted by T_U_D

It is not the first time this has happened nor will it be the last. The one year only U.S. 2003 E39 540i ‘M Sport’ had forged wheels while the E39 M5 had cast wheels. That was a fairly big slap in the face.

E46 M3 regular also came w/ cast 18". The only option I added to mine was the forged 19".

[Quadruple VANOS]

This is also how composite braking systems, and center lock hubs help justify their existence. They’re lightening a highly beneficial area of unsprung weight, rotating weight, and inertia.