My measured top speed is 42 mph and I am amazed at some of the speeds posted here! While in college I descended a hill on my 10 speed road mike and couldn't keep up with the peddles in top gear. Not sure what speed I hit (no speedo) but my bike started speed wobbling at this point and it scared the h out of me.
I hate to admit this but the older I get the more fear I have with high speeds. I start thinking about how bad it would be to have a blow out at 30+ mph. When I was young these thoughts never crossed my mind.
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Uphill or downhill; headwind or tailwind; Pavement or Dirt ... it's all good.