Originally Posted by
1989Pre
Take the chain off of the chainwheels and rest it on top of your bottom bracket. then spin the crank and see if it spins freely.
I have a bike that seemed to ride slowly. When it was assembled the cranks preload was too high and the cranks didn't spin freely with the chain removed. I reassembled to the correct torque spec and it was a world of difference.
Make sure everything on the bike drivetrain spins freely.