Are 400i wheels made from Magnesium or Aluminium Alloy

Your question is a bit mis-phrased -- both 400 and 400i wheels (and 308 wheels) are made from "light alloy" (which is a special Aluminum alloy with about 30~35% Magnesium -- so a very high Mg content, but not enough to truly classify it as a "Magnesium alloy" as it is often wrongly called).

 

Does anyone know how they alloyed that?

Matt

 

Since we are on this subject are the 365 wheels the same?

 

Heck, let’s also throw 412 wheels into that question! Anyone know?

Ruben

 

365GT4/2+2 OM = cast light alloy
412 OM = no wheel material information given

 

Thanks Steve!

 

Can anyone suggest a reputable firm that restores these wheels? I have 15” wheels on the shelf that have some bubbling and curbage. What I don’t want is for someone to blast them, use filler and when I eventually go to mount them up in a few years they are bubbling again.

 

Good day Christian,

If you cannot find someone locally, perhaps try the author/company within the following link:

https://stevekouracos.com/restoration/tips-and-tricks/aluminum-magnesium-wheel-restoration/

Cheers,

Sam