Take on rough gravel and long backroad adventures with more control and less fatigue. The PRO Discover Carbon handlebar pairs a confidence-boosting 20° flared drop with ergonomic tops, so you stay comfortable on the hoods for hours and get a stable, planted grip when the terrain gets technical.

Highlights

  • Lightweight UD carbon construction: high-quality unidirectional carbon keeps weight low while delivering the stiffness you need when the road gets rough.
  • 20° flared drops: widen your hand position in the drops for more leverage, stability, and control on loose gravel, technical descents, and off-camber terrain.
  • Ergonomic tops with 5° backsweep: shaped to spread pressure across your palms for reduced fatigue on long days in the saddle.
  • Compact drop geometry: 110mm drop and 75mm reach keep the drops within easy reach so moving between the hoods and the drops feels natural.
  • Full internal cable routing: supports both mechanical and electronic cables for a clean, uncluttered cockpit with fewer off-road snag points.
  • Shimano Di2 integration: developed to complement Shimano's GRX gravel components with full Di2 wiring integration.

Built for gravel control

The 20° flared drops open up your hand position when you grip low, giving you more leverage and a more secure hold over rocks, ruts, and washboard gravel. The compact bend and short reach make it easy to transition between the hoods and the drops, so you can react quickly as terrain changes beneath you.

Comfort that lasts all day

The ergonomically shaped tops feature a 5° backsweep that eases wrist angle and distributes hand pressure more evenly across the bar, reducing fatigue on longer rides. UD carbon construction keeps overall weight low without sacrificing the lateral stiffness needed for efficient power transfer.

Tidy, integrated cockpit

Full internal cable routing channels both mechanical cables and Shimano Di2 wiring inside the bar, keeping your cockpit clean and minimising the risk of cable snag on branches, packs, or gear. Designed as part of PRO's gravel component ecosystem, the Discover Carbon integrates seamlessly with PRO stems, seatposts, and clip-on accessories.

Compatibility & Fit

Clamp diameter is 31.8mm, compatible with standard 31.8mm gravel and road stems. Width is 400mm centre-to-centre — also available in 420mm and 440mm. Developed specifically to complement Shimano GRX shifters and brakes, with full support for Shimano Di2 electronic shifting integration.

PRO components carry a limited manufacturer's warranty against defects. For warranty support, return the item to Tune Cycles.
  • UD carbon construction — lightweight and robust for gravel and adventure riding
  • 20° flared drops for improved stability and control on technical terrain
  • 5° backsweep on ergonomic tops reduces wrist strain and hand fatigue
  • Compact geometry: 110mm drop, 75mm reach for easy hood-to-drop transitions
  • Full internal cable routing for a clean, snag-free cockpit
  • Shimano Di2 compatible with integrated wiring channels
  • Developed to complement Shimano GRX gravel components
  • 31.8mm clamp diameter — fits standard gravel and road stems
Part NumberPRHA0450
MaterialUD Carbon
Width (C-C)400mm (40cm)
Clamp Diameter31.8mm
Drop110mm
Reach75mm
Backsweep
Flare20°
Cable RoutingFull internal (mechanical & Di2)
ColourBlack
SKU SHM-PRHA0450
Barcode # 8717009402347
Brand PRO