The RockShox SID Ultimate Race Day 29" Boost in Red gives you SID Ultimate performance — DebonAir spring sensitivity and Charger Race Day damping — in a crown-adjust configuration and a bold Red colourway. The crown-adjust 3-position lever puts Open, Pedal, and Locked modes within reach without a handlebar remote, keeping the cockpit clean and uncluttered.

  • Charger Race Day 3-position crown lever: Open / Pedal / Locked
  • DebonAir air spring for exceptional small-bump sensitivity
  • 120mm travel, Boost 15x110mm Maxle Stealth
  • Tapered alloy steerer for modern frame compatibility
  • Red finish

The Charger Race Day damper is tuned specifically for the demands of XC racing. Pedal mode firms up low-speed compression for efficient power transfer on climbs, while Open delivers full sensitivity for technical sections. Locked is useful for smooth fireroad transfers. The crown-lever means no handlebar clutter from a remote — compression adjustment is made by hand at the crown, which suits riders who rarely need to switch modes mid-ride.

DebonAir's large air volume and equaliser valve let you run lower air pressures than conventional air springs while maintaining support, helping the fork track rough terrain more closely. Fits 29" wheels on Boost tapered headtube frames.

RockShox products carry a 2-year warranty against manufacturing defects. Warranty claims for this product should be directed to Tune Cycles. Return the item to us with proof of purchase and we will manage the warranty process with the brand on your behalf.
  • Charger Race Day damper with 3-position crown lever — Open, Pedal, and Locked
  • DebonAir air spring for class-leading XC sensitivity and large air volume
  • 120mm travel optimised for cross-country racing and fast trail riding
  • Boost 15x110mm Maxle Stealth thru-axle for maximum lateral stiffness
  • Tapered alloy steerer for compatibility with modern tapered headsets
  • Red colourway for a distinctive build aesthetic
  • ZipTie fender, star nut and Maxle Stealth included
SpecificationValue
Wheel size29"
Travel120mm
Axle standardBoost 15x110mm (Maxle Stealth)
SteererTapered alloy
Spring typeDebonAir
DamperCharger Race Day (3-position crown)
Lever positionsOpen / Pedal / Locked
FinishRed
IncludesZipTie fender, star nut, Maxle Stealth
SKU PSI-RX004020957004
Model # 004.020.957.004
Barcode # 710845916939
Brand RockShox