RockShox SID Ultimate Race Day 3-Position Remote 29in Boost Fork

Light, fast, and composed—the SID Ultimate 3P Fork charges hard with XC control

What Our Gearhead® Experts Are Saying:

"I’ve been running the SID Ultimate 3P on my XC rig, and it’s a total game-changer. The new 3-position damper makes it easy to fine-tune on the fly, and the DebonAir+ spring eats up chatter without sacrificing sprint efficiency. It’s lightweight, but stiff and precise when the trail turns techy."

We ride the RockShox SID Ultimate 3P Fork when we want our race-day rig to handle more than just the start line. Whether we’re hitting smooth singletrack or techy climbs deep in the woods, this fork stays light, planted, and responsive under pressure. With a new 35mm chassis, it’s stiffer and more composed than ever while maintaining XC-ready weight and efficiency.

The updated Charger Race Day 2 damper offers three-position compression control—Open, Pedal, and Lock—right at your fingertips for fast adjustments between sprint efforts and rocky descents. The DebonAir+ spring enhances small bump compliance while offering tunable mid-stroke support that’s ideal for backcountry loops and stage races alike. From modern XC to downcountry and beyond, the SID Ultimate 3P is ready to lead the charge.

Details

• Lightweight suspension fork for cross-country and trail riding
• New 35mm chassis adds stiffness and control without excess weight
• Charger Race Day 2 damper with 3-position remote compression tuning
• DebonAir+ spring enhances small-bump sensitivity and mid-stroke support
• Includes Maxle Stealth, bolt-on fender, and star nut for clean setup
• Boost axle spacing improves front-end stiffness and tracking
• Flatter axle-to-crown for confident handling in technical terrain
• Item #RSXB07J

Tech Specs

Travel

120mm

Stanchion Material

aluminum

Lower Material

magnesium

Crown Material

aluminum

Wheel Size

29in

Steer Tube Diameter

1.5in tapered

Stanchion Diameter

35mm

Axle To Crown

[120mm, 29in] 531mm

Rake

44mm

Spring Type

air, DebonAir+

Damper

Charger Race Day 2

Adjustability

3-position remote compression, rebound (remote sold separately)

Lockout

lockout

Axle

15 x 110mm boost

Brake Compatibility

disc, Post Mount

Rotor Compatibility

[min] 180mm, [max] 220mm

Claimed Weight

3lb 4.2oz (1480g)

Activity

cross-country

Manufacturer Part Number

00.4020.957.005