I rode mine 5 miles on the road and lost probably 10-15 studs on the rear tire on my first trail ride. An experienced rider I know says that's the result of not doing enough break in miles. His well worn Nokains are not missing any studs, which he says is the result of following the 30 mile recommended break in. He says it's not a big deal to be missing studs and certainly I haven't noticed the difference. I did more road miles and haven't lost a stud since (that I've noticed).