Powertap C1 Chainring Powermeter, made in conjunction with FSA by power specialists Powertap for a dual sided crank based measurement.
Powertap: The C1 chainring is a full featured, crank-based power meter that features dual-sided measurement. The FSA-made, one-piece chainring design provides added stiffness for shifting no matter the terrain. Available 53/39, 52/36 and 50/36 chainring tooth options for 5 bolt, 110 BCD cranks, the C1 mounts to existing hardware on the bike. Additionally, dual band ANT+ and Bluetooth SMART connectivity make the C1 an obvious choice for riders looking for more features and better value.
Crank Interface: 5 bolt, 110 BCD compact
Connectivity: ANT+ and Bluetooth SMART
Tooth Combinations: 50/36, 52-36 and 53/39
Firmware Updates: Over the air
Added Weight: About 150 grams
Battery Life: 200 hours
Powertap provide a 2 year warranty worldwide on all of their PowerTap branded power meters.