The Pioneer SBT-PM91 Bluetooth/ANT+ dual power meter provides power and cadence data, like most bicycle power meters. But also offers the flexibility to use as a left or right side only solution. It also has some extra functionality around left/right efficiency and balance not available from other meters. Doesn’t quite meet the claimed weight of 61g. 4g for magnets is excusable, I suppose. Maybe the 8g (69-61) difference is the CR2032 batteries?
Pro:
- Real left/right/total power solution
- Available as a kit to install on your crank, or pre-installed on a crank
- Does not require magnets for power/cadence data
- Easy to install if skipping the magnets
- Two power meters in one solution (i.e. can operate as a left side, right side, or dual power meter with configuration change via mobile device)
Con:
- Magnet installation is a pain
- Does not fit on all bikes
- Expensive, although not relative to other dual power meters
- Garmin doesn’t support special Pioneer power meter functionality
