u/Strict-Anteater4915

Just pulled these off the line and wanted to share, because the finish gets asked about a lot.

It's a brushed base with a translucent candy red on top — not a solid paint. The face is mechanically brushed first, then the red goes on as a semi-transparent layer, so the brush grain reads through depending on the light. You can see it shift in the side shots vs the face shot. Solid red would've buried all that texture.

Specs for the curious:

• Forged 6061-T6, monoblock
• 20" staggered, 8J front / 9.5J rear
• 5x112, 66.6 bore (so BMW fitment)
• Went for the deepest concave the rear width and ET28 would allow

The concave on a heavier SUV like an X4 is the part people underestimate — you want the dished look but the spoke section still has to carry the load, so how deep you can go is set by where the barrel meets the face, not just by aesthetics. The fronts at ET12 have less room to play with than the rears.

Happy to answer finish or fitment questions.

I work at a forged wheel factory in China. These are forged magnesium, just came off the lathe — we cut the outer skin to get the oxide layer off before they move on to the next stage.

Here's the thing. Once that skin is gone, bare mag comes out bright with that fresh-cut finish, and by eye it's almost impossible to tell apart from aluminum. Pick one up and you'd know right away (mag is noticeably lighter for the same size), but in a photo? Good luck.

People always ask how we tell them apart on the floor without checking the paperwork. Honestly it comes down to the weight, the way the swarf behaves when you're cutting it, and how quickly the bare surface hazes back over if you leave it sitting out.

These are AZ80. Not the grade most people expect on a wheel, which is half the reason I'm posting.

Figured the machinist crowd here would appreciate the finish and the "wait, that's magnesium?" double-take. Happy to answer whatever.

I run a wheel manufacturing operation, so I spend a lot of time thinking about why wheels look the way they do. Most of it isn't styling — it's heat. Figured some of you might find the breakdown useful, especially the EV part at the end, which trips a lot of people up.

The short version: nearly every performance wheel is "open" (lots of gaps between the spokes) for three reasons — more surface area to shed heat, a path to funnel cold air into the brakes, and less unsprung weight. None of that is aesthetic. It's the wheel quietly helping your brakes not cook themselves on a hot day.

A few things that actually move the needle:

Spoke shape. Classic thin 5- or 6-spoke designs leave big gaps and breathe really well. Multi-spoke / radial patterns are similar. The "full face" / disc-style wheels you see on a lot of luxury cars look great but trap heat — sometimes they'll actually hold it in.

Open area ratio. This is the real fight: more openings = better cooling but more drag; closed face = less drag and better range/MPG, but worse cooling. There's no free lunch.

Surface finish. Boring but real — gloss black soaks up and holds sun heat, bright/chrome finishes reflect more. Color isn't only cosmetic.

Now the part that surprises people: EVs. Manufacturers love closed aero wheels on EVs because range is everything and a closed face cuts drag. But EVs are heavy and their brakes (when they're not regen-ing) have to absorb a lot. So you've got the worst cooling design bolted onto the application that arguably needs cooling the most. That's the compromise engineers are quietly fighting every time you see a slick closed EV wheel.

Material matters too — aluminum is light and strong enough that you can run fewer, thinner spokes and bigger openings, so it ventilates better than steel almost by default.

Curious what the people here think: would you trade a few miles of range for a more open, better-cooling wheel on an EV? Or is the closed aero look just the future and we live with it?

I came across this production line where large aluminum rings are being processed (see image).

From what I can tell, these look like wheel barrels for multi-piece forged wheels, but I’m not sure about the exact process.

• Is this spinning, rolling, or another forming method?
• What are the advantages of this process compared to fully forged monoblock wheels?
• How does it affect strength and weight?

Would appreciate insights from anyone with experience in wheel manufacturing or metal forming.