Originally Posted by
PaulRivers
Nope, you aren't going to go from already hitting 20mph (what the OP) wrote, changing a few things on your bike and doubling your speed in the real world, without magical powers. I don't think even illegal drugs and professional training would get you close.
I read the OP was taking 22-23 min to cover 4 miles. If he was doing the 4 miles in 12min (20mph) I don't think he would have been asking the question.
I did say he'd have to extend his commute. Regardless of what his ultimate speed ends up there's no question he can ride significantly faster than 10.5mph with some work and a few equipment changes. No drugs required