The METRON TTW is Vision's rear disc wheel for time trial and triathlon racing. The full carbon lenticular body presents an unbroken surface to the air rather than the open spoke bed of a conventional rear wheel. Vision builds it on the PRS hub, which uses a 72 tooth helical clutch ratchet.
The rim is tubeless ready and runs a 21 mm internal width, giving a broad seat for current race tyres. Four sealed chromoly steel cartridge bearings turn on a 17 mm hub axle, and the rotor fits a centre lock interface. The alloy freehub is ordered to suit either Shimano HG or SRAM XDR cassettes.
Quick Facts
| Feature |
Specification |
| Rim |
Full carbon lenticular disc, 21 mm internal width |
| Brake and Rotor Mount |
Disc brake, centre lock |
| Freehub Standard |
Shimano HG road 10 to 12 speed, or SRAM XDR |
| Tyre Fitment |
Tubeless ready clincher |
| Claimed Weight |
1,008 g |