Rotor InSpider Power Meter

Rotor has adapted its InSpider power meter for MTB use. With a smaller form factor it is compatible with 32-tooth chainrings. It connects to your head unit via Bluetooth and ANT+, and because it features 4 pairs of strain gauges, it can deal with oval chainrings which can wreak havoc with some other crank-based power meters. The whole thing weighs 536 grams with carbon crank arms (or 635 in alloy). The chainring uses a BCD 100 pattern. The rechargeable battery should last 350 riding hours. In terms of data, it measures power, cadence, estimated balance, torque 360 and OCA.