PowerTap is the second most established power meter manufacturer and entered the market as a more affordable alternative to SRM.
It’s a unique design with the power meter built into a rear wheel hub and said to be accurate to within +-1.5 per cent. PowerTap’s hub-based design means you can easily switch the wheel – and, therefore, the power meter – between bikes in a flash, though you are limited to that wheel for both training and racing (unless you buy two or more PowerTaps, of course).
PowerTap significantly dropped its prices in August 2013, with the G3 hub, said to weigh 325g, now £699, while many wheel manufacturers (including FFWD, Zipp and Mavic) offer pre-installed PowerTap builds. Like SRM, PowerTap is compatible with its own Joule computer, as well as any ANT+ unit.
Pros: Easily moved between bikes, price drop, user-friendly
Cons: Limits wheel selection when training and racing