Buy a bike computer. Install, set it up. Ride and read.
Ride a known distance. Time your ride. Calculate your mph from the time and distance.
Install Strava, runkeeper or similar app on your phone. Activate, ride, check your results.
You can find a JCPenney lightweight 3-speed bicycle for sale at JCPenney stores or on their website.
the faster the speed of the bicycle,the brighter the lamp
The average bicycle speed is around 15-20 km/h.
The standard chain width for a 9-speed bicycle chain is 6.6mm.
You may be able to find a Sears Roebuck Free Spirit bicycle with a 3-speed gear system at vintage bike shops, online marketplaces like eBay or Craigslist, or through collectors who specialize in vintage bicycles.
Braking reduces speed.
The speed ratio of a bicycle is the (gear ratio* radius of the wheel)/ Length of the pedal arm.
Mark Cavendish's top speed on a bicycle is around 45-50 miles per hour.
The average speed of a bicycle on Google Maps is around 10-15 miles per hour.
An 11-speed cassette is compatible with a 25-tooth cog on a bicycle.
The standard chain width for an 8-speed bicycle chain is 7.1 mm.
The output from the dynamo varies with the speed of the bicycle. And as a geared bicycle is likely(but don't have to) travel a bit faster than the single speed, it may produce a bit more electricity.