Hey all. Picked up a Schwinn Mirada for a utility/commuter bike and I need to switch out the tires. It's a big heavy steel rigid frame mountain bike, so I'm a little concerned about how it'll handle narrower tires. Any recommendations on the skinniest tires I should go with?

Here are the two that I'm considering at the moment:

GEAX Streetrunner Mountain Tire 26x1.6: http://www.nashbar.com/bikes/Product...5_10000_202472

Michelin Pilot City Commuter Tire 26x1.85:
http://www.rei.com/product/774366/mi...:referralID=NA