S4 Caliper Update

The S4 caliper, born on Guide Ultimate, now moves to the complete Guide range. While retaining the on-trail characteristics of Guide, the S4 caliper will add the following features to Guide RSC, RS and R:


  • Bleeding Edge
  • Heat Management (Heat Shield, wide pad pocket and piston insulators)
  • Rollback Consistency (new gland geometry and piston design)

International Pricing

  • Guide RSC: $205 | €224 | £172
  • Guide RS: $154 | €168 | £129
  • Guide R: $133 | €145 | £112

S4 Caliper

The S4 Caliper features consistent rollback and easy set-up, improved heat management features, and Bleeding Edge porting and adapter technology for easy bleeds.


  • Pistons diameter: two 14mm and two 16mm pistons for power and modulation
  • New seals and gland geometry for improved consistency no matter the conditions
  • Heat Management: enlarged pad pocket, insulated pistons, and Heat Shield reduce operating temperature and minimize heat transfer to the caliper body
  • Bleeding Edge: bleeding adapter and porting for quick, mess-free bleeding

Bleeding Edge Technology

New bleed porting and fluid path make it easier to push fluid through the caliper for quick and easy bleeding. Dedicated bleed adapter plugs into the bleed port on S4 calipers. It seals the system to minimize air contamination and fluid loss.

Updated Reach Adjustment

  • New detent design
  • More positive feel
  • Eliminates creep
  • Smaller nub
  • Backwards compatible