Power meters are the most accurate way to fine-tune your training and measure your pace on race day. The bad news is, they can be expensive. The SRM power meter can cost upward of $3,000, and because it's built into the crank, switching from bike to bike isn't an option. Garmin's Vector 2S, on the other hand, costs a reasonable $900 (pedals included), and because it's a pedal-based power meter, use on multiple bikes is fairly painless. It measures watts and cadence accurately, and will also transmit your live data to any Garmin GPS (and Garmin Connect) wirelessly. And unlike power meters that are built into the hub or crank, the Vector 2S will work on almost any bike, regardless of your component choices.