Not sure what Im doing wrong. Im on my 4:30am ride and I snaped the bolt that holds the seat on. Its a Cannondale hybrid and I dont think Im riding it really hard though the morning rides are my workouts, for my legs not the bike. Ive been riding a limestone trail which does cross a few curbless streets. Since I broke one back in Feb, Ive been careful and got out of the saddle when crossing the streets as I thought the minor bouncing @ 14mph might have done it. I've been riding the same style and trails with this bike for 4 years without any problems but to have 2 break in months... I know the seat was not loose when I started either.
Im also 20lbs lighter (now 230) than when I first got the bike. Its kind of a shock to have the seat fly off with 5 miles left to go.
On the other hand, its quite a workout on the legs to stand & ride with no seat.