[s-cars] Lug Bolts

[Igor Kessel]

A Tay wrote:
> Hi all,
> 
> My friendly local tire shop has discovered they have been using conical lug
> bolts in the ball sockets of my winter wheels. (After 5 seasons of
> switchovers)

Ouch! You're quite lucky to be able tell us this story in person.

> They have switched to supposedly the correct ball style lug bolt.
> 
> My question is the ball size used on Audis a common size?  
> 
> The shop says they are all the same size but im hesitant to trust them on
> this one.

They are correct. The ball seat diameter is ~25mm. I was successful in 
using a 1" spherical end mill for turning (reaming actually) the conical 
bolt seats in my MOMO Arrows. The surface mating is spot on.

-- 
Igor Kessel
two turbo quattros