4iiii is a brand driven by results. Powered by their mantra of 'Smarter. Faster. Safer.' 4iiii design and produce some of the lightest, most accurate power meters, and heart rate monitors for world's top athletes. At ProBikeKit, we stock the complete 4iiii range, so, whether you're training for a personal best or a podium topping performance, you can rest assured that you have the right tools for the task.