From Peter White,
Q: You used to say that only Nokian made good studded tires. Why have you changed your tune and are selling Schwalbe?
A: Schwalbe used to specify steel studs for their studded tires. Now they have carbide studs, just like Nokian, so I'm now happy to sell Schwalbe studded tires as well as Nokian. We've been selling many other Schwalbe tires for several years now (see my web page) and the quality is terrific. We've been very happy with the quality of the Schwalbe studded tires.