Princeton Blur 633 V5 Disc Brake Rear Wheel

The Princeton Blur 633 V5 Disc Brake Rear Wheel is Princeton CarbonWorks' latest rear disc, built for riders who measure their races in seconds per kilometer rather than group ride pace. This is a full carbon disc wheel, not a spoked design, and it's aimed squarely at time trial and triathlon riders chasing every available aero advantage on the flats and rolling terrain where a disc rear earns its keep.

The V5 update trims 125g from the previous generation, bringing total weight down to 910g while keeping the 23mm internal, hooked rim profile that accepts either tubeless or tubed tires. That internal width matters more than it sounds like it should: a hooked, tubeless-ready bead seat lets you run a wider tire at lower pressure without sacrificing the aerodynamic shaping that makes a disc wheel worth the investment in the first place. Princeton builds the Blur 633 to be disc brake specific, so it's set up for thru-axle frames and the braking systems that now dominate the time trial and triathlon bike market.

Inside the hub, the Blur 633 V5 runs Princeton's Tactic TR01 v2 internals on ceramic bearings, and it's available with a Shimano/SRAM HG11 freehub, SRAM XDR driver, or Campagnolo compatibility, so the wheel can go on frames running any of the major drivetrain standards. Ceramic bearings reduce rolling resistance compared to standard steel units, a detail that adds up over the length of an Ironman bike leg or a 40-kilometer time trial where marginal gains compound.

Princeton points to results as the real test of the design, noting that the Blur 633 has been raced to grand tour time trial stage wins and professional Ironman victories. A rear disc wheel behaves differently than a spoked wheel in crosswinds, and riders moving up to a disc for the first time should expect a wheel that tracks confidently in a straight line but wants a steady hand when gusts hit from the side, particularly on exposed courses. For riders already comfortable with a disc rear, the Blur 633 V5 rewards that experience with lower weight and less rolling resistance than the wheel it replaces.

The Blur 633 V5 comes in ten finishes, from matte black and matte white to gloss options in chrome, chameleon, cobalt, gold, sand, and red, giving riders a way to match the wheel to a time trial or triathlon frame's paint scheme rather than settling for a stock black disc. For triathletes building a race-day wheel and time trial specialists looking to shave time on a flat or rolling course, the Blur 633 V5 is a purpose-built tool rather than an everyday training wheel.