On Sun, May 22, 2011 at 9:17 AM, Spehro Pefhany wrote: > There are a number of commercial products that offer direct power > measurement:- > > http://www.westbrookcycles.co.uk/transmission-components-c189/chainsets-c= 75/sram-2010-s975-srm-power-meter-crankset-p35922 > > http://www.powermeters.org.uk/cycling/cycleops-powertap-elite+-mtb-hub-on= ly/104379149/2698/ > > http://www.powermeters.org.uk/cycling/cycleops-powertap-elite-plus-wheel-= system/40926216/1857/ > Unfortunately, these are all very expensive and way out my budget. I was thinking of something I could make, or buy for a cheap price. GPS/acceleration sensing would be /very/ inaccurate because the whole point of this is to measure my performance in wind and things like that. The torque measuring hub seems to be the best, but it's very expensive :( --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .