Wheel bolt.dilema

[PJmak]

Ok so I added 10mm spacers to my car and I need longer bolts. The problem is, they are OZ Racing wheels and they use a R12 radius bolts while mercedes use M12 radius. To me these two bolts look identical but aparently it's crucial to use the right bolt because the OZ wheels are designed for R12 radius bolts.

This is the spec of the bolt that was originally on my wheels and I never had issues:

BB12X1.5 35UL 17HEX R12

It's the bolt on the left below. The bolt.on the right is a factory mercedes bolt.

I basically need the same spec bolt but longer. I need 50mm of thread. Also, I can't help but wonder if this really matters at all. I mean the bolts look basically identical.

 

[MercEdi]

Essentialy the R in R12 stands for „Radius“, indicating that it‘s a radius of 12mm. The M in M12 stands for metric, which refers to the thread size (12mm). I think that all M12 Mercedes wheel bolts have an R12 ball radius, so the ball on both of the bolts should be the same.

So you‘d just need to get bolts with an R12 ball radius and the proper shaft/thread length.

 

[gsxr]

Mercedes wheels with 14mm bolt holes have R14 radius ball seats, and should not be used with R12 ball seats. If your wheels & lug bolts are matching R12/M12, all you need is a longer R12/M12 bolt.