Not sure what chainring/cassette ratios you are running, but I often hit 35 mph on our Philadelphia area hills (the surrounding counties) in the 53 chainring with 12-25 cogs in the back. I am spinning around 110 at the time with my 17-18 cogs. Going over 40 mph at various points pushes that up above 120. I consider myself a 'spinner', but cannot hold my cadence above 130-5 without getting sloppy.

If you are spinning at 199 your legs are truly a blur of motion. My guess is that the online program you are using is very optimistic. Anything over 150 rpm is really spinning up a storm. I'm going to have to dig out my gear-in charts and calculate some speeds now that you've brought this up.

The peleton in today's stage of the Giro were doing about 48 mph on the 6 mile downhill into the finish run. They were running 53 with 11 or 12 or 13 cogs and none of them that I could see were spinning at much over 100-110 rpm. These guys were flying and it was the entire peleton.

Also - Congratulations to Cipo on winning his 41st stage in the Giro. He is quite the competitor as well as being very entertaining.