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Some people like gearing so tall that they have to drop a gear to climb inclines. And why not, your arms and legs are not broken.
For my bike the taller gearing puts 60mph at about 5500 rpm. Under 60 it has enough power to pull the rather steep interstate climb in top gear, barely. Going faster it bogs down to 60 where the wind drag is less then it just stays there. A true testament that wind drag is the greatest enemy. If I had a (ahem) sleeker body, I can see where 15hp would be quite enough to pull 70mph in almost all situations, uphill or down.
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Good design is simple. Getting there isn't.
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