I'm going to steal a page from Jim from Boston's playbook and quote myself from a couple of other threads regarding Schwalbe studs that are pertinent to your query:
Originally Posted by
mcours2006
The 'carcass' on my Schwalbe's failed yesterday. I noticed a flat on the rear. Upon close examination of the inside of the tire found that the studs here wearing through to the inside, puncturing the tube this way. I've had about four winters worth of use from these. Mileage wise perhaps 5000-7000 total. I usually run the pressure a tad higher as most of the rides are not necessarily on snow or ice.
There is also significant stud loss on one side of the tire.
So looks like time for a new set.
Originally Posted by
mcours2006
Schwalbe Marathon winters, 35 mm, at 60; probably need to bring it down to 50 for a more comfy ride.
Rider weight is 145#, bike weight is close to 30# with all the 'stuff';
How'd it go? Front flatted on the driveway. Stud went through on inside of carcass. The same thing happened last week with the rear. Maybe pressure is too high for that tire.