I can relate to what you are saying Stratocaster, and I'm even lighter than you. Last year I bought a cheap 23 pound FG bike to see if I liked the fixed thing. I did. So this year I bought a more expensive 725 Reynolds steel FG that's about 18 pounds. Both bikes are set up similarly. The lighter bike does feel less sturdy, especially when jumping train tracks or going downhill at 140 RPM crank speed.