Last fall I bought a new bike and started riding, layoff in the cold winter months, and started again riding now. I don't know how much I'll ride, now I'm doing 25 mile rides and I want to get it up to 40-50 miles at least once per week. I want to try to ride 2-4 days per week if not more. New bike, new tires. Should I have 2 extra tires in my garage as either backup if a tire is ruined or when I wear out these tires? I'm posting this because Performancebike.com has Continental Ultra Gatorskins on sale for $25 and I didn't know if this is such a good price I need to buy 2 and put them away until I need the.