We've got a couple of guys down here who are ex body builder types, one guy we call the incredible hulk. He's not much of a threat in a road race, but when he comes out of that last corner in a crit, he can sprint like a demon. Maybe weight training doesn't help for efforts more than 90 seconds, but many a race is won and lost in the last 90 seconds.

Sprints, acclerations out of corners, small hills on a circuit race, are all efforts less than 90 seconds, but all make a difference in the outcome of a race.

Keep up the weight work, work you core too, abs and back etc. Just not with a lot of weight. Stretch, Be an athlete first, then a cyclist. It's healthier.