Originally Posted by
McBTC
... 83 gear inches = 42 mph at 170 rpm. That's pretty high gearing, no?
42x16 is 69 gear inches.
Originally Posted by [URL="http://www.bikeforums.net/members/street_sweeper-333036.html"
street_sweeper[/URL] ]how do you spin at 170 rpm?
by
passively allowing the hill to spin one's legs
(I calculated the rpm afterwards when I saw the top speed from the gps)