Built for fast, confident gravel riding, the PRO Discover Carbon Handlebar pairs a generous 20° flare with a lightweight UD carbon construction, delivering extra control and stability on loose, technical terrain without unnecessary weight. The compact drop and ergonomically shaped tops keep your hands comfortable through long days in the saddle and easy to reach when the going gets rough.

Highlights

  • 20° flare: opens the drops wide for greater leverage, stability, and braking control on rough gravel and loose descents.
  • UD carbon construction: lightweight and robust layup delivers stiffness where you need it and compliance where you don't.
  • Ergonomic top section: shaped for all-day comfort with a uniform-diameter mid-section to accommodate GPS units, lights, and Shimano GRX sub-brake levers.
  • Compact 110mm drop: keeps the transitions from tops to hoods to drops natural and within easy reach.
  • Full internal cable routing: supports both Shimano Di2 wiring and mechanical cables for a clean, snag-free cockpit.
  • Developed for Shimano GRX: geometry and integration designed to complement Shimano's gravel-specific groupset.

Control where it counts

The 20° flare angles the drops outward, widening your grip and giving you more stability and braking leverage on descents and washboard gravel. Combined with a 5° backsweep and compact reach, the bar keeps your position natural and powerful through technical sections and long gravel stages alike.

Light and comfortable

The UD carbon layup is engineered for stiffness under pedalling loads and selective compliance through the tops, so vibration and trail noise are absorbed rather than transmitted directly to your hands. The ergonomically shaped top section spreads pressure across the palms to reduce fatigue on all-day rides.

Tidy cockpit

Full internal routing carries Shimano Di2 wires and mechanical cables through the bar for a clean front end. The uniform-diameter mid-section leaves room above the clamp for a Shimano GRX sub-brake lever, a cycle computer, or lighting — exactly where you want them on a gravel rig.

Compatibility & Fit

Clamp diameter: 31.8mm (fits standard 31.8mm road and gravel stems). Width: 44cm (centre-to-centre). Drop: 110mm. Reach: 75mm. Backsweep: 5°. Flare: 20°. Compatible with Shimano Di2 electronic systems and mechanical cable groupsets. Designed to integrate with Shimano GRX gravel components including GRX sub-brake levers.

PRO components carry a limited manufacturer's warranty against defects. For warranty support, return the item to Tune Cycles.
  • 20° flare gives extra width and control in the drops for gravel and mixed-terrain riding
  • Lightweight UD carbon construction balances stiffness with compliance
  • Ergonomic top section with uniform-diameter mid-section for accessory and sub-brake lever mounting
  • Compact drop (110mm) and mid-reach (75mm) for a natural transition through all hand positions
  • 5° backsweep for improved wrist alignment and all-day comfort
  • Full internal routing for both Shimano Di2 wiring and mechanical cables
  • Designed to complement Shimano GRX gravel groupset
  • 31.8mm clamp diameter fits standard road and gravel stems
BrandPRO (PRO Bikegear)
Part NumberPRHA0452
MaterialUD carbon
Width44cm (centre-to-centre)
Clamp Diameter31.8mm
Drop110mm
Reach75mm
Flare20°
Backsweep
Drop ShapeCompact
Top ShapeErgonomic
Cable RoutingFull internal (Di2 + mechanical)
ColourBlack
SKU SHM-PRHA0452
Barcode # 8717009402361
Brand PRO