This Trek Speed Concept 7.5 is the best choice for a triathlon or time trial bike. The carbon fiber material and 11 speeds make it lightweight and fast. The Medium frame size is perfect for a unisex adult, and the aerobar style handlebar adds to the streamlined design. It comes with Ultegra Shimano components, rim brake mechanical braking, and race road tires for maximum performance. This bike is perfect for those who want a reliable, efficient, and sleek ride.