Gray Triathlon / TT Bike Wheels & Components

For flat, low-wind courses, deeper rims over 60mm or a full disc rear give the biggest aerodynamic gains and can save up to 10 watts at 40 kph versus alloy wheels. Carbon rims are the usual choice for that profile, while slightly shallower options like the Zipp 454 NSW (53–58mm) offer a bit more crosswind control.

Shallower 40–60mm rims and wavy rim shapes tend to be more stable in sidewinds than very deep sections, so they’re a smart pick on rolling or wind-prone courses. A 53–58mm wavy profile can strike a balance between aero benefit and crosswind control without the instability that some 60–80mm deep rims show.

Double-check axle spacing—options include 12x100mm thru-axle or QR—and confirm the freehub matches your drivetrain, such as Shimano or SRAM XDR. Also verify hub compatibility with 11–13 speed drivetrains so you don’t run into fit issues at the hub.

Yes, hookless rims that are tubeless-ready are designed to seal tubeless tires and often improve strength, but they typically require tubeless-compatible tires rather than standard clinchers. Look for internal rim widths of about 20–25mm to comfortably fit 23–40mm tires, like the 54 Aerodynamicist Carbon Disc which uses a 20mm internal width.

Carbon rims and spokes increase stiffness and reduce weight, which helps with acceleration and sustained speed; many high-end sets weigh around 1428g per pair. Ceramic bearings and high-flange hubs improve rolling smoothness and longevity, while designs like the Cadex Aero 4‑spoke add targeted stiffness with a 22.4mm internal width for modern tires.