I am going to buy a cyclometer with the cadence feature, but I have yet to pay enought attention to my cadence. I will try and pay attention to my cadence the next time out. I would guess I am in the lower RPM range also.
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2007 Jamis Ventura Comp
2006 Jamis Explorer 2.0
2000 Specialized Hardrock (bought used)
Swim, Bike, Run and sounds like fun