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"Optimal" cadence varies with what you're trying to optimze, so your question doesn't have a simple answer. Freely-chosen Cadence vs. a Targeted Cadence A recent review by Hansen et al. summarizes what is currently known about factors affecting choice of cadence. In particular, they conclude "[d]uring high-intensity cycling, close to the maximal aerobic ...

Trek had a bicycle a few years ago named "Lime" which had 3 speed automatic gearing. I don't think it sold well. It used a gearing system called "Coasting" that was created by Shimano and actually controlled by a computer chip from signals from the front hub. "A dynamo is fitted on the front hub that gauges the revolutions of the wheel. It sends this ...

100 RPM minus your age. (Only half kidding.) 80-90 RPM is a good target for younger, fairly serious bikers. When I was in my 20s-30s I could do that for several hours. As I get older (I'm 63) I find it harder -- 70 RPM is probably closer to my "optimal" speed now, and I drift down toward 60 if I don't keep at it. One rule I tell folks that I think is ...

Right now I am at 159 hours of riding time on the battery which came with my GSC-10. Garmin's stated battery life for the GSC-10 is 1.4 years at one hour of riding per day which works out to 511 hours. (See page 51 of the Edge 500's Owner Manual) On the interweb I've come across two different suspected causes for low battery life on the GSC-10: Some ...

Out on the road its a mixture. But first, are you able to measure your cadence? I use this as my guide (i.e. I try and keep my cadence within a certain range no matter what the gradient) - if I am able to pedal comfortably at over 80rpm, then its time to change to a bigger gear. If I'm unable to pedal comfortably at 65rpm, its time to go to a smaller gear. ...

Optimum efficiency is usually quoted as being somewhere above 80rpm which is usually a good deal faster than most people spin. http://adventure.howstuffworks.com/outdoor-activities/triathlons/training/cycling-cadence1.htm

First off, unless you aspire to be a professional racer (or at least a highly competitive amateur) ignore the advice that you "must turn at least 90 rpm" or whatever. Secondly, even if you DO have such aspirations, you're not going to do well by trying to achieve a high cadence right from the start -- it's something that you must develop slowly. With ...

I have ridden one - it used weights thrown out by centrifugal force and springs to move the derailleur in and out. Horrible is all I can say. Maybe it was me not being used to it, but things like not being in the gear you left it in, and less than smooth changes - which you have not idea when they are going to happen, especially under power. The only ...

I've had my GSC 10 since 2008. I used to get about 1 to 2 months out of name brand CR2032 batteries, but have since switched to Harbor Freight batteries. I get about 4 to 6 weeks out of these (a four pack of these costs about the same as a single name brand battery). Like you said, it all depends on your riding habits and environment though. The above is ...

My experience with the GSC10 (though with an Edge 305 not a 500) has been that the batteries last 6 to 12 months, or roughly 2500 to 5000 miles of riding. That works out to something like 125 to 250 hours of operation. That is considerably less than what is stated in the manual, but in the ballpark of what the other two answerers experienced. The ...

There have been attempts over the years, but never particularly successful. One I recall used a 5-speed rear hub that was shifted by weights on the spokes, similar to a centrifugal governor. I expect that, with the new electric shifters, there will be some new attempts at it in the next year or two. With a computer it should be possible to be reasonably ...