Now there's the sense of adventure! This summer I have my '66 Collegiate at the church for a couple of lunchtime rides each week. The way I figure it, 40 lbs of E-F bike, 5 gears, and 10 miles of steep hills should burn plenty of calories and build strong legs. I'll let you know about the results by Labor Day. BTW, I also bought my S-6 tires at bikepartsusa.com.