only one is always in contact with the ground

Shimano SH51 cleats are a single-release which are slightly more difficult to release compared to the multi-release SM-SH56 cleat

What exactly is Human Factor you ask

All-mountain performance for your next wheel build

This allows for more travel in a larger variety of bike frames

Leatt ReaFlex Hybrid Pro Knee Guard - S - Black Replace Images only one is always inThe Leatt ReaFlex Hybrid Pro Knee Guard is a super slim, CE certified knee guard that delivers high performance and excellent protection. It features ReaFlex impact gel, providing a soft and flexible fit while remaining tough under impact. The added upper leg padding safeguards against handlebar strikes, and the ventilated knitted mesh base layer adapts to any leg shape, ensuring great stability and comfort. Features: Total Leatt Protection Score: 14