5 minutes over 21 miles due to a modern bike?
I haven't heard so much bull**** in one sentence since the last political convention.
Kinda harsh Iab.
The new bike, being lighter and having more gears wasn't the sole reason for the the time reduction.....obviously OP has been training harder and was in better shape. The new bike inspired confidence to push harder, and had the lower weight and gearing options to maximize the effort.
I say to the OP, bravo, well done...keep up the training !
Joe