Originally Posted by merlinextraligh

If Little Arnold is averaging 14-15mph on his loop on a hybrid, he's not that far off from doing 20mph on a good road bike.

As the power data above indicates, with good form on a road bike he's already got the power for around 18mph.

Getting from 18mph to 20 mph is a jump but one he should be able to do with some work.

I'm making some assumptions here based on his public profile.

1) he's on a fairly heavy hybrid with wide touring tires, and an upright position.
2) he get's a decent road bike with low rolling resistance tires, and a good aero position
3) he's a new cyclist, and essentially untrained, other than just what fitness you get from riding around, and
4) he's willing to put some work in training.

When you first start cycling gains come fast. So going form 18mph to 20mph is easily obtainable in a few months of training if you work at it.