M758

Dissimilar metals?
Studs are steel and so are the nuts...


The reson for steel lug nuts is due to the number of times they come on and off. For a street car you maybe pull the wheels off once every 5000 miles. (ok more if you are "working on it" alot).

For a typical track weekend in my race car... lets count

Get to the track.
1... Replace old storage tires with practice race tires Torque to 90 Ft-lbs
Run one or two track sessions.
2... Replace practice tires with Race tires for qualy - Torque to 90 ft-lbs
3... Morning of day two rotate tires and run practice tires again - torque to 90 Ft-lbs
4... replace with "race" tires for qualy -
5... replace race tires with storage tires. Hand tight no torque and drive up on trailer

So that is 5 tires changes in 1 weekend. Some times I don't need to scrubb in new tires so I run my 'race' tires all day, but I always rotate from one day to the next. So figure at least 1 tires change per day of track use. Possibly 2.

That is ALOT of tire changing for aluminum lug nuts.

mj951

The galvanic reaction i was conserned about was between steel nuts and aluminum wheels, true the studs are steel but there is more surface contact between the lugs and wheels. Sounds like a none issue, thanks for the input.

rickb20

A Porsche mechanic told me that the wheel lug nut LOCKS were titanium, but that the lug nuts themselves were aluminum.

With so many people hearing the same thing there must be some origin for the common story.