(I posted this earlier but with incomplete formula, I have now added the correction for your calculations. It was coming up with a ridiculous answer before, even my legs dont go that fast !!)
I have included a bit of audience participation in this posting about my ride on Tuesday.
I went for a ride on my rebuilt fixed wheel bike yesterday around my Ouse Valley route by way of a test ride prior to regular riding through the winter.
The participation is that although I had my Garmin on the bike I don’t have a cadence sensor fitted so I dont know what my average pedalling rpm was. I can give you the detail to work out the maths and see what you come up with.
Gear inches has no current physical significance; it corresponds to the diameter in inches of the main wheel of an old-fashioned penny-farthing bicycle with equivalent gearing. You enter the number of teeth on the chainring, the number of teeth on the rear sprocket and the wheel and tyre size and in my case it was a 44 tooth chainring, an 18 tooth rear sprocket and a 700c wheel with a 23mm tyre. The gear size based on those figures works out to be 64.2 inches.
So, to make the calculation you have :-
Gear Size = 64.2 inches per pedal revolution ( As its fixed there is no freewheeling ! )
Ride Distance = 30.12 miles
Ride Time = 1 hour 57 minutes 46 seconds
then divide that number by pi (3.14)
From this you should be able to calculate the average pedal rpm for the ride.
If you choose to take part in a little seasonal fun you can enter your answer in the comments (Just the answer not the working out.) or e-mail me at email@example.com there will be no prizes, just the kudos of getting it right and some seasonal fun!
By the way, I have already worked it out myself , I think !!!!
(Sorry but I cant seem to post the full ride details as the Garmin Connect site seems to have stopped working. Maybe I can attach the details later but you have the info you need for the calculation.)