Vision Metron 91 Disc Brake Wheel - Rear

The “91” in the name is not a code or a model number — it is a statement. Ninety-one millimeters of full-carbon rim depth, shaped for triathlon and time trial racing, built to eliminate every avoidable aerodynamic penalty at the rear of the bike. The Vision Metron 91 Disc Brake Wheel - Rear is Vision’s deepest clincher offering for disc brake bikes, designed for the athlete whose race is decided in the aero position and whose equipment needs to keep up.

Vision is the wheel and aerodynamic component brand within FSA (Full Speed Ahead), a global manufacturer that has supplied professional cycling and triathlon teams for decades. The Metron 91 sits at the top of that lineage — a wheel developed through CFD analysis and wind tunnel testing to optimize the 91mm rim profile for real-world aerodynamic performance across the yaw angles that actually occur during racing. The goal is not just speed in a straight headwind, but consistent aerodynamic advantage as wind direction shifts over the course of a long bike leg.

The rim is full carbon throughout, running a clincher profile that is also tubeless-ready. Vision includes tubeless rim tape, valve extenders, and a Centerlock lockring in the box, so setup requires no additional purchases. The hub is built on Vision’s PRS system with a 2:1 spoke lacing pattern — two spokes on the drive side for every one on the non-drive side. This asymmetric lacing improves lateral stiffness at the rear wheel, where spoke angles are naturally more acute on the drive side due to cassette spacing, creating a more uniformly tensioned and rigid structure for power transfer and disc brake forces. The spokes themselves are aero-bladed and direct-pull, eliminating the elbow bend that can be a fatigue point in traditional j-bend spoke designs.

The rear hub runs on four sealed cartridge bearings (six total across the wheel system, with two in the front hub) and uses a Centerlock disc rotor mount compatible with all major disc brake systems. The wheel is built for 12mm thru-axles and is available with a Shimano HG freehub (10-12 speed) or SRAM XDR driver. ABS self-locking brass nipples hold spoke tension against vibration and the thermal stress of repeated hard braking, reducing the likelihood of detuning over time. At 1,023 grams for the rear wheel, the Metron 91 carries the expected weight of a purpose-built, 91mm carbon racing wheel — this is not a wheel that pretends to be light. It is a wheel that is uncompromisingly fast.

Every Metron 91 is artisan built by hand. In an era of increasingly automated wheel production, Vision continues to build the Metron line with human hands from start to finish — a process that allows for the kind of precision tensioning and quality control that automated lines can struggle to replicate consistently in high-performance deep-section builds.

Design Benefits

1. 91mm full-carbon rim depth: Maximum aerodynamic advantage for flat to rolling triathlon and TT courses — the deepest clincher in Vision’s lineup delivers front-of-pack aero performance without requiring a full disc wheel.
2. CFD and wind tunnel development: The rim profile was shaped through computational fluid dynamics and wind tunnel testing to maintain aerodynamic advantage across the range of yaw angles that occur during real-world racing, not just in a perfect headwind.
3. 2:1 aero-bladed direct-pull spokes: The asymmetric lacing pattern puts twice as many spokes on the drive side, correcting for the naturally acute spoke angles caused by cassette spacing and producing a more uniformly stiff, laterally stable rear wheel structure. Direct-pull spokes eliminate j-bend fatigue points.
4. ABS self-locking brass nipples: Resist detuning through vibration and thermal cycling, keeping the wheel true and properly tensioned over high-mileage use.
5. Tubeless-ready with full kit included: Rim tape is pre-installed and Vision includes valve extenders and a Centerlock lockring in the box, making tubeless setup straightforward without sourcing additional supplies.
6. Artisan handbuilt construction: Every Metron 91 is built by hand for precision tensioning and quality control across a high-performance deep-section carbon build.

Final Take

The Vision Metron 91 is Vision’s clearest statement about what a triathlon rear wheel should do: eliminate drag, hold its line, and not ask you to make excuses for your equipment. At 91mm of carbon rim depth with a disc brake hub, tubeless-ready construction, and handbuilt quality, it delivers what the name promises. If you’re racing where the terrain is flat to rolling and the bike leg is where races are made, this is the wheel built for that specific task.