i ride my bicycle about 20 or so miles a week .. most times just cruising along at 5 or 10 mph or so .. on one road i travel there is one of those signs that give your speed .. the first time i tried i hit 20 mph .. it caught me off guard a bit so i was`nt at full speed and my old bike was an 18 speed .. my new bike has 21 speeds .. i tried again a few days ago and hit 22 mph with a little left in the tank i think plus i had already ridden about 6 miles .. anyway where i`m going is about 55 years ago when i was able to collect 6 returnable soda bottles i would ride to the store on my bike and trade them for a cold double cola ..10 cents plus deposit bottle .. on my route i had to ride past Dog Zilla .. a huge black German shepard .. i see now that they can run 30 mph .. i dint know that then but he never caught me so i must have been doing 31 on my little one speed 20 incher .. my 13 year old legs must have been a blur compared to my now 67 year old hams .. i`m going to try again and see if i can hit at least 25 .. yet even at that speed Usain Bolt could still run past me .. that man could put them up a down ,, he can run 27 mph ..i have tried taking a picture at speed but it`s too dangerous peddling like a mad man trying to hold the handle bar with one hand ,, trying to look through a one inch viewing screen .. i may have someone take a shot if i can hit 25 ..