Vision Metron Disc TL Rear Wheel Disc 700c TL DB CL HG 11/12sp. The Vision Metron Disc TL Rear Wheel is a high-performance rear disc wheel designed for time trials and triathlons. Its full carbon construction and disc profile offer unmatched aerodynamic efficiency helping riders maintain top speeds with minimal drag. Tubeless-ready and disc brake compatible it delivers smooth rolling and confident braking making it a go-to choice for elite-level racing against the clock.