PowerTap was one of the first companies to mass produce power meters and has been a leader and an innovator for decades. PowerTap began by producing hubs that could be built into a custom wheel or purchased as a factory built wheel. PowerTap hubs quickly became a staple of the pro peloton, professional triathletes, and mountain bikers. Recognizing the need for more product versatility they expanded their product line to include single and dual sided measurement at the pedal with the P1 and P1s, and at the crank with their integrated 1 piece chainring the C1. Made in Madison Wisconsin, PowerTap stands behind all of their products with an excellent customer service and warranty department. When purchasing PowerTap power meters, you may buy with confidence.