I have had alot of trouble with flats lately. I went through three on one mornings ride. So I went out and bought a real thick (thorn proof) tube (700 x 23). When I got on to ride the next day I noticed during my warm up the iSport displayed 40W while coasting downhill. All I could think to do was to run through the fast start setup. I did that and everything seemed fine. My question is: could the new tube have changed the orientation (tilt) of the front wheel enough to mess up the iSport? If it changed the circumference it would have just affected speed?
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