http://cyclingtime.com/tw/documents/8404.html AROFLY- Cycling data measures by tire pressure variation A small & light Power meter device,provides quite good and reliable data The current trend of bicycle training, my point of view, power training has long been the mainstream, down to the club riders, up to professional cyclists, as long as the people who are dedicated to riding strength, more or less have been exposed, or even completely immersed among the areas of power tr