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question about gearing and tailwinds(4 posts)

question about gearing and tailwindstrekkie1
Nov 18, 2002 7:00 AM
Let's say Joe rides a double century as fast as he can, 100 miles out, 100 miles back, perfectly flat road, no wind, and averages 20 mph. Another day, with the same fitness and bike, there is a terrific direct headwind on the way out, so strong he can average only 9.5 mph on the way out. The wind remains for the return trip.

So, assuming 700c x 23mm tires and that he can sustain 100 rpms, what gearing will he need on the way back to get his average back up to 20 mph over all?
63/17Spoiler
Nov 18, 2002 7:29 AM
nm
He'd need the Star Trek transportervindicator
Nov 18, 2002 8:04 AM
and a time machine to boot. He'd have to get back to the start a half hour before he reached the midway point to average 20mph. I don't think there's a gear made that'll do that!

Dave
yea, first clue was that the first 100m was less then 10mphjoekm
Nov 18, 2002 8:37 AM
i.e. - at 10mph average speed, he'd have to instantly teleport back to average 20mph for the trip.

Wasn't going to say anything, but as long as someone else brought it up....