Studs are generally meant for extra traction on trails and such. Ice racers are hardcore tires of death with like 800-1200 screws in them. Not for the faint of heart, My buddy cuts himself to ribbons every year.

A consumer studded tire would be virtually useless in an ice race..

http://www.coupedesglaces.org/
On one f the older sites 2006 I think there was a great tut on making a tire. WARNING sites are being weeeeeird!

OK site @ 12:35 seems ok goto 2006 I did english and see article regarding ice tires.