I live in the Twin Cities and ride North Shore trail every year as it is the most beautiful and generally well maintained trail. Don't worry about studs -- their are not many trails that don't allow. I stay at the Mariner in Silver Bay because it is very clean and cheap. The owner/operator is a piece of work that you need to get to know. I also like to stay in Tofte or Grand Marais. The Gunflint trail gets remote and sometimes not groomed as good, but if it is groomed, it is awesome. I have rode to Grand Portage but this is best if you are going to stay overnight there as it is a hike. But the trails in the reservation if groomed are some of the most beautiful in the country. Not much signage in the reservation either. Trails around Finland/Isabella are excellent too. In general, trails in Northern MN have much less traffic, less bar stops, less signage, less road crossings than trail in WI.