Originally Posted by tippy
I went to the Garmin website and posted the question there. No response yet.
I can see how you could set up the cadence/speed sensor to read speed, however I can't see why you would want to know "this" speed when you have a perfectly good GPS receiver that can give you speed.
In cadence mode, you would have both cadence (from the magnet sensor) and speed (from the gps receiver) available. In speed mode, you would have two versions of speed (mag pickup and gps).
Still waiting on answer from Garmin.
d.tipton
Originally Posted by dan828
Is that even workable? I mean you'd have to have all your gearing info entered into the computer along with a way to sense what gear you were in in order to estimate speed from cadence alone.
No. To get speed ... you need time and distance. Timing is easy. Distance is the circumference of the wheel taking into account where the magnet is from the axis. This is typically how most cycle computers "calculate" speed.
I received an email from a Garmin rep concerning the Edge305 capabilities. He said the ONLY way the Edge305 presents speed data is via the GPS receiver not a magnetic on the wheel. I responded by pointing out that the specs web page for the 305 says differently and suggested someone at Garmin edit the page to reflect the info he just provided to me.
d.tipton