4iiii Shimano Dura Ace 9200 PRECISION 3+ Left-Side Power Meter Black, 165mm

When it comes to measuring our power and cadence, we trust the 4iiii Shimano Dura Ace 9200 PRECISION 3+ Left-Side Power Meter to provide us with accurate data right to our head unit. The low-profile design is so lightweight we won't even know it's there, and it's backed by up to 800 hours of battery life to keep us riding season after season with confidence.