I have two bikes, a 19" MTB and a 56cm hybrid. On the MTB the measurement from the ground is 1 5/8" greater to the top of the pedal, center of the crank and the top of the seat than the hybrid. The problem is when I stop and step off the MTB it feels like I'm stepping in a hole compared to hybrid. I'm starting to think that maybe my MTB is too big. Is this normal? I'm about 5' 10". Thank You.