New A4 fan

What's the benefit here? I guess Benz has them too.

Perpetual Novice

pressing the studs into the hub causes some warping and distortion. They went to wheel bolts, and then the rest of the germans followed.

QuattroRocket

So that those of us that are new to impact guns can cross thread a few of them and spend hours running around the city looking for a tap and die the right diameter and pitch to fix our dumbass mistake ! Or so I heard from someone somewhere who shall remain unnamed ;-)

ccweems

On most US cars the studs are screwed in opposite to the handedness of the nuts tightly, often with thread lock. You shear off a stud or cross thread one and it can be a real bitch getting the last bit out. You shear a free spinning bolt and you will have a better chance. I could envision that there is less stress of a free spinning bolt in the hub than a tight fitting stud. There are some aftermarket studs used one per wheel on those with wheel bolts to make changing flats easier.

Perpetual Novice

use a standard socket wrench and a torque wrench at the end when putting them back on, using an impact wrench will overtorque them, and that can cause your rotors to warp.

<deleted>

The bolt thing sux.
I've sheared off studs, and sometimes its a pain, but usually not. Besides, how often does that happen?

If you ever notice, all the race cars use studs (unless they use centerlocks of course - even then they have unthreaded studs)...

On Japanese cars, the studs are pressed in, not threaded. This works great IMO...

Only reason I can see is cosmetics.... just put a little plastic cap on the bolt - no need to worry about variances in stud protrusion.. Often design is dictated by manufacturing, packaging or cost. Not just performance...

If I raced my car, I would switch to studs ASAP... (though I think its silly to race such a heavy car)

Perpetual Novice

Read below, Pressed studs cause distortion