STAGES 9000 G2

£649 It was Stages who first made power meters affordable with its brilliantly simple left-side crank design. The second generation (G2) is much more robust, includes carbon cranks for the first time and the range begins with the 105 version, costing £359. Battery life of the coin cell CR2032 is claimed to be over 200 hours, and the Stages meter is compatible with TrainingPeaks, Strava and Garmin Training. It’s accurate and adds just 20g to the weight of the crank arm. stagescycling.com