Originally Posted by
woodcraft
Looking at the gear calculator, 39/24 only gets you about 16mph at 125 rpm, not even 18 mph at 140 rpm.
I think you'll have to shift to reach your goal.
Did you figure 27" wheels? Thats very interesting. I just calculated 16mph as 23.466 feet per second and if you divide it into 328ft (aka 100m) it comes out to 13.977 sec. Thats a flying start at 16mph. I started from a stop so I would have had to reach a much faster speed than 16mph to make up for not having a flying start. It would be interesting to be able to calculate what speed I must reach by what point to equal desired elapsed time. ( any time faster than the previous time).