Freedom to measure power data from any bike you've got stashed in the garage is a valuable thing, and until now, it wasn't an option available from PowerTap. The P1 Power Meter Pedals represent a huge step forward for the brand's versatility, measuring power entirely from one mechanism contained in the pedals. If you're looking for data on your output on the roads but decide to step up your XC training midway through the season for a fall race, just swap out the P1 pedals to whichever machine you choose in the same way you'd switch any other pair of pedals. Another benefit of having power measured directly from the pedals is the ability to collect data from each leg. Everyone has a dominant side, and knowing which half of your body works harder during a ride can be extremely beneficial. Once you have the P1 pedals set up, they'll pair easily with your existing head unit, as PowerTap wisely made them compatible with ANT and Bluetooth Smart, and to move them between bikes, you won't need any special tools beyond what you'd use to change out a normal set of pedals. PowerTap does deliver the setup with its own cleats and hardware, which you should stick to using exclusively with the pedals to make sure the interface works the way it should, and you can plan on the battery keeping the system running for about 60 hours of pedal mashing, berm rallying ride time.