Originally Posted by
Daniel4
A few weeks back I thought of using a mountain bike to commute when the winter comes. So I got my son's mountain bike road worthy and took it for a test ride. Boy, did I ever get tired!!! And it's so slow.
The gear ratio of the 15th gear is 48:14. My Sekini 10 speed's 10th gear is 52:14. The extra 1" diameter on the wheels also helps.
So in my opinion a mountain bike is just too slow for commuting. Even if you plan to use mostly park trails, you'll have to come out to join traffic at some point of your trip.
48/14 at 80 rpm is just under 20mph, 24 mph at 100 rpm...how fast are you going?
Originally Posted by
Daniel4
Well, I don't know about all that. All I know is on my 1979 Sekini 10speed racer, the wheels are 27in dia. the crank set has 52teeth on the largest sprocket and the cassette has 14teeth on the smallest sprocket. On flat ground I peddle about about 7 revolutions per 5 seconds (I just estimated this at my desk), that's 84rpm. Something like 36rpm uphill and I've done uphill on 10th gear.
So at 84rpm I don't know how those calculations would have me going at over 100.
That's 100" traveled per pedal revolution, not mph or whatever.