Revzilla has a number of reviews on the Dunlop Sportmax D220 and the tires get an average rating of 1.7 out of 5. After reading the reviews, I'm starting to think of getting new tires when I only have 1660 miles on the bike since new a few months ago. Are these tires so bad they are a safety hazard? Bike tires aren't that expensive, and one of the highest rated tires is the Michelin Commander II tires and they are around $160 per tire. Pretty reasonable cost for peace of mind. Thoughts?