Until recently, I had a bottom of the line suspension fork which did not have a lockout. When climbing out of the saddle on short, fairly steep hills on my commute, with weight shifted forward, the suspension would move with each pedal stroke. Rather than the effort going into moving the bike forward, a substantial amount of energy was lost in the fork movement.
When I removed the suspension fork, I was surprised to find it weighed about 2 pounds more than the rigid cromo replacement fork. Riding on the flats is about the same speed with the rigid and suspension, with small bumps probably handled a little better by the rigid and larger bumps/curb drops better with the suspension.
Last edited by alan s; 07-25-10 at 09:00 PM.