It looks like to me that the Nashbar studded tire is actually the Kenda Klondike.
I have the Nashbar tires and i never knew this before. I knew they were made by Kenda but I didn't know they were also sold as a Kenda Klondike. According to the bikeman website, these tires have a carbide tip. I did not know this?
See the following quote:
Kenda's new studded tires feature a special polymer body carbide tip that retracts with use to provide longer life.