Wow,

Coasting on a downhill, I hit 19 mph. Otherwise I can get into the
12mph range. That is usually in gear 14 to 15. I haven't used gears 19
through 27 much because I usually ride through the city streets and
can be subject to lots of stops and starts. I am also trrying to crank
at a much higher cadence.

I am going to do a 10K in a couple of weeks just to ride a closed
course in the higher gear range. I am going to try to keep my speed
above 12mph.

What kind of training do people do to get starting line explosiveness?

Steve