If a bicycle is traveling at 20mph?

thinktankthing

New member
If the wheels are rolling at 20mph what rpm are they running at, NOT at the crank but at the wheels? Let's say it is rolling down a hill at 20mph without pedaling.

There has to be a way to determine this without a bike. What do you think?
Thanks for the formula Bill and Tim, I can take it from here. I'm going to let you battle it out in voting.
 
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