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Hey i go about 104-110rpm in a gear of 20 inches and go about 15mph is this good?

by | earlier

and one more thing i was thinking i own a mtb and a road bike and in a gear of 80inches on my road bike i can fly but but to get my mtb to go 15-20mph or to get it to move i got to go to a 20.3 inches gear and i was thinking why is this so

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It is definitely a lot harder to get to 20mph on a MTB than on a road bike. 15mph is a good speed to average with a MTB, but I would have thought that is a rather high cadence to achieve that speed - on my MTB I can speed up to about 25mph on the flat without too much trouble and generally average around 15-16mph. To go 15mph my cadence would be about 80rpm.
Report (0) (0) | earlier
It might be if you actually could.

You use all the right terms, but you got something wrong somewhere!  A cadence of 110 rpm in a 20.3" gear on a mountain bike will give you a speed of about 6.5 mph ... NOT "15-20 mph".  To achieve a 20 mph speed in that gear you would need to spin at over 330 rpm ... and I doubt you can!

See the article at the link and do the math.  I think you will find that a road and mountain bike are equally fast in the same gear at the same cadence.
Report (0) (0) |   earlier
dont know much about biking to be honest...but some riders in the tour de france a few days ago were pushing 60 and i can run 20
Report (0) (0) | earlier
To be honest I'm pretty amazed you can get to 20mph on a 20 inch gear whatever cadence you are cycling at. There is a handy calculator for speed based on gearing and wheel size on Sheldon Brown.

http://www.sheldonbrown.com/gears/index....
Report (0) (0) | earlier
You go about 15 mph. Does that mean you can hit that speed or that you can sustain it for some length of time. I'm never impressed by people who say they can hit a certain speed on a bike but I am impressed by people who can sustain a high speed for prolonged periods because that is the real measure of an athlete's aerobic fitness. Track cyclists in sprint events like the kilometre time trial can hit speeds of just under 50 mph and they're doing it on the level from a standing start.
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