Synthesis DH 11 Mixed Carbon Wheelset
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The ultimate racing combination.

Boost XD I9
Boost HG I9

The ultimate racing combination.



  • 29 Front/ 27.5 rear mixed wheel set
  • Tuned Front and Rear Carbon Wheel System for downhill.
  • Front and rear specific wheels tuned and optimized to address the specific performance requirements and loads of mountain bike riding.
  • Compliant tuned front wheel improves handling and maximizes grip and control in turns.
  • Stiff tuned rear wheel supports peak loads and enhances stability and tracking at speed.

Larger front wheel:

  • Faster rolling at speed
  • Improved grip through maximizing contact patch 
  • Reduced trail chatter

Smaller rear wheel:

  • Lower rotational weight leads to faster acceleration
  • Improved handling through tight sections of trail
  • Easier to change direction
  • Allows rider space to move further back on the bike


engagement (I9) 0.52º Quick Engagement/ Six Pawls
ETRTO (27.5) 584mm
ETRTO (29) 622mm
front hub dimensions Boost: 20mm, Standard: ISO 20mm
hub (I9) Synthesis 11 (Industry Nine Hydra Hub)
Hub Type 6 Bolt
inner rim width front 31.5mm
outer rim width front 40mm
outer rim width rear 40mm
rear hub dimensions 12x157mm (installed)
12x150mm (axle end cap kit available)
rim height 18.75mm
spoke count front 28
spoke count rear 32
spokes front Sapim CX-Ray
spokes rear Sapim CX-Sprint
warranty lifetime (rim only)
weight for set 1956g
inner rim width rear 31.5mm