Hayes Bike

Frequently Asked Questions

• When should I pick a 4‑piston Dominion versus a 2‑piston setup?

  Choose a 4‑piston (Dominion A4/T4) for aggressive enduro, downhill, or heavy e‑bike use where peak stopping power and heat capacity matter, and opt for a 2‑piston (A2/T2) for lighter trail, cross‑country, or riders who prioritize lower weight and slightly crisper modulation. Both piston counts retain Hayes’ predictable bite and modulation; match rotor size and pad compound to your terrain and heat load for best performance.
• How do Hayes Dominion brakes perform in wet, technical terrain and what is their modulation like?

  Dominion brakes are engineered for consistent 360° performance with a minimal deadstroke and an intuitive ramp‑up that resists grabbing on wet roots and rocks. The system delivers low‑force modulation that helps reduce rider fatigue on long, technical descents while maintaining reliable power in both wet and dry conditions.
• Are Hayes Dominion brakes compatible with my bike and how do I check fitment?

  Dominion calipers and hoses are built for standard MTB caliper mounts and common rotor sizes, but compatibility depends on your frame/fork mount, rotor diameter, adapter availability, and lever reach. Verify your frame/fork mounting standard, choose the correct rotor size and adapter, confirm hose length and routing, and test lever feel before final installation; Hayes also offers youth‑specific JUNIT/Dominion options for 20" and 24" wheel sizes.
• What pads and rotors work best with Hayes Dominion brakes?

  Hayes ships Dominion brakes with aluminum‑backed pads; for high‑heat, longer life you can use sintered/metallic pads on big‑hit disciplines like downhill or heavy e‑bike use, while organic/resin pads often give quieter, more progressive feel for trail riding. Use rotors rated for your discipline and heat load (thicker/heavy‑duty rotors for enduro/downhill) and follow Hayes’ rotor thickness and pad‑spec recommendations to ensure proper bite and modulation.