RockShox SIDLuxe Ultimate 3P A2
SIDLuxe Ultimate 3P A2
SIDLuxe Ultimate 3P A2
SIDLuxe Ultimate 3P A2
SIDLuxe Ultimate 3P A2
RockShox

RockShox SIDLuxe Ultimate 3P A2

In Stock

The RockShox SIDLuxe Ultimate 3P A2 is a featherweight XC rear shock with a three-position Open/Pedal/Lock compression system, Solo Air spring and race-focused damping for maximum pedaling efficiency and control.

Add to Cart
🚚 Fast Shipping 🔒 Secure Checkout ↩ Easy Returns

Available Options

Option Price Availability
RockShox, SIDLuxe Ultimate 3P A2, Rear shock, 210x50, Shaft Eyelet: Standard, Body Eyelet: Standard, R85, C30, X8, 1 Token — In Stock
RockShox, SIDLuxe Ultimate 3P A2, Rear shock, 190x45, Shaft Eyelet: Standard, Body Eyelet: Standard, R85, C30, X8, 1 Token — In Stock
RockShox, SIDLuxe Ultimate 3P A2, Rear shock, 190x42.5, Shaft Eyelet: Standard, Body Eyelet: Standard, R85, C30, X8, 1 Token — In Stock
RockShox, SIDLuxe Ultimate 3P A2, Rear shock, 190x40, Shaft Eyelet: Standard, Body Eyelet: Standard, R85, C27, X8, 1 Token — In Stock
RockShox, SIDLuxe Ultimate 3P A2, Rear shock, 170x35, Shaft Eyelet: Standard, Body Eyelet: Standard, R85, C30, X8, 1 Token, Santa Cruz Blur 3 — In Stock
RockShox, SIDLuxe Ultimate 3P A2, Rear shock, 190x42.5, Shaft Eyelet: Standard, Body Eyelet: Standard, R57, C30, X8, 1 Token — In Stock
RockShox, SIDLuxe Ultimate 3P A2, Rear shock, 190x40, Shaft Eyelet: Standard, Body Eyelet: No Bushing - 90 Deg Rotation, 0 Tokens, R29, C25, Lockout 8, Specialized Stumpjumper Evo 2021+ — In Stock
RockShox, SIDLuxe Ultimate 3P A2, Rear shock, 190x45, Shaft Eyelet: Standard, Body Eyelet: No Bushing - 90 Deg Rotation, R29, C25, X8, 0 Token, Epic 8 Evo — In Stock
RockShox, SIDLuxe Ultimate 3P A2, Rear shock, 165x42.5, Shaft Eyelet: Trunnion, Body Eyelet: Standard, R85, C30, X8, 1 Token — Out of Stock

Product Details

Overview & Technology

RockShox SIDLuxe Ultimate 3P A2 (Product #140904, MPN 00.4118.417.000, SRAM Model ID RS-SIDL-ULT3-A2) is a purpose-built, lightweight rear shock engineered for cross-country race bikes where efficiency and rapid acceleration matter. The Ultimate 3P adds a refined three-position compression system — Open, Pedal and Lock — to give riders a clear on-trail advantage: open for active traction on rocky climbs and technical singletrack, pedal for firm platforming on power sections, and lock for sprinting or smooth roads. The damper is an RL-style layout with external rebound adjustment and a minimal high-speed compression tune to keep weight down and pedaling feel immediate. Construction centers on a Solo Air spring, machined aluminum body, and standard or trunnion eyelet options depending on model size, delivering a durable yet lightweight package (shipping weight ~1.1 lb, compact shipping dims).

Key Features & Real‑World Benefits

Three-position compression (Open / Pedal / Lock) gives on-the-fly control without overcomplicating adjustments — flip to Pedal for efficient climbs, Open for descending traction, Lock for hard accelerations. Riders will notice reduced bob on sustained power and confident composure on rough XC descents thanks to the deliberate low high-speed compression setting. Solo Air spring & tunability: The Solo Air platform lets you balance suppleness and support by simply changing pressure and adding/removing bottomless tokens. Combined with external rebound and factory default settings (R85, C30, X8, 1 Token) this shock is ready out of the box for aggressive XC setups while remaining easy to dial in for different rider weights and trail styles.

Fit, Compatibility & Installation

The SIDLuxe Ultimate 3P A2 is available in a range of eye‑to‑eye sizes (210x50, 190x45, 190x42.5, 190x40 and a trunnion 165x42.5) with either standard shaft eyelets or a trunnion mount depending on the variant. One factory-specified frame compatibility is the Santa Cruz Blur 3; check your frame's eye‑to‑eye and stroke requirements before ordering. Confirm whether your frame requires a standard or trunnion mount and select the matching variant. Installation is straightforward for an experienced mechanic: use proper torque on hardware, set sag with recommended pressure, and verify clearances. If you’re unsure about mounting dimensions or bushings, consult your frame manufacturer or bring the shock to a certified RockShox service center to avoid fitment issues.

Who This Shock Is For

This shock is aimed squarely at cross-country racers and fast trail riders who prize lightweight efficiency and quick pedaling response. If you race XC, do long fast climbs, or want the lightest, simplest rear shock with a useful three-position damper, the SIDLuxe Ultimate 3P A2 is built for you. It’s also a great upgrade for Blur owners and other lightweight hardtail or short-travel full-suspension riders who want a race-ready feel without sacrificing descending poise. Riders who demand maximum efficiency on climbs but still want competent damping on technical downhills will appreciate the balance this shock strikes.

Key Features

  • ✓ Three-position Open/Pedal/Lock compression for pedaling efficiency and control
  • ✓ Lightweight machined aluminum body tuned for XC race performance
  • ✓ Solo Air spring with bottomless tokens for tunable mid-stroke support
  • ✓ RL damper with external rebound adjustment for precise rebound control
  • ✓ Factory default tune (R85, C30, X8, 1 Token) optimized for race-ready feel
  • ✓ Available in multiple sizes including 165x42.5 Trunnion and 210x50
  • ✓ SRAM Model ID RS-SIDL-ULT3-A2 — direct-fit option for Santa Cruz Blur 3
  • ✓ Minimal high-speed compression retains suppleness on technical terrain

Specifications

Damping RL
Damping Adjustments External rebound, 3 position compression (Open/Pedal/Lock)
Default Settings R85, C30, X8, 1 Token
Eye-To-Eye 210x50
Primary Color Black
Spring Adjustments Air pressure, Bottomless tokens
Spring Type Solo Air
Shaft Eyelet Standard
Body Eyelet Standard
Frame Compatibility Santa Cruz Blur 3

Product Identifiers

Vendor Item # 00.4118.417.000
UPC 710845890468

Frequently Asked Questions

Will this SIDLuxe fit my frame?

Compatibility depends on eye-to-eye length, stroke and mount type. The SIDLuxe Ultimate 3P A2 comes in several sizes (165x42.5 Trunnion, 190x40/42.5/45, 210x50 standard eyes). Measure your current shock or check your frame spec and choose the matching variant. If in doubt, contact Forest Bikes with your frame model and serial to confirm fit.

How do I set sag and tokens for my weight?

Start with the recommended sag for your frame (usually 25–30% of travel for XC). Inflate the Solo Air to the suggested pressure for your rider weight, then fine-tune by adding or removing bottomless tokens to increase mid-stroke support without raising spring pressure. Use small increments and test on typical trails to balance pedaling efficiency and small-bump comfort.

What does the 3-position compression actually change on the trail?

Open allows the shock to respond freely to bumps for traction; Pedal adds platforming to reduce bob and improve power transfer while retaining mid-travel compliance; Lock (not a hard lock like a hardtail) firms the compression for sprinting or smooth climbs. It’s a quick way to adapt shock behavior without revalving or complicated clicker adjustments.

How often should this shock be serviced?

For regular riders, RockShox recommends a lower-leg/air can inspection service every 50 hours and a full damper service around every 125 hours or annually, whichever comes first. Racing or harsh conditions may require more frequent attention. Always use RockShox parts and seals, and have damper work done by a qualified technician if you’re not comfortable with internal servicing.

Is the Ultimate different from other SIDLuxe trims?

Yes. The Ultimate trim prioritizes the lightest materials and a race-oriented low friction tune. The 3P package specifically adds the three-position compression lever for on-the-fly platforming. Other trims may focus on durability, adjustability, or price and can feature different damper bodies or internals.

Can I use this shock on eMTBs or enduro bikes?

The SIDLuxe Ultimate 3P A2 is optimized for XC and light trail use; heavy eMTB or enduro duties expose the shock to loads and heat beyond its design intent. For enduro or eMTB use, choose a shock specifically built for higher-energy impacts and prolonged braking loads.

Buying Guide

When choosing a cross-country rear shock, prioritize correct eye-to-eye length, stroke, and mount type (standard vs trunnion) above all else. Decide whether you need race-focused lightness or a more robust, adjustable damper for mixed trail use. Spring type matters: Solo Air is compact and tunable for XC riders, while coil springs are heavier but provide predictable support in aggressive disciplines. Next, consider damper features — a multi-position compression lever like the SIDLuxe Ultimate 3P A2 is invaluable for on-the-fly pedaling control, while external rebound adjustment lets you quickly tune recovery. Factor in serviceability and support: high-end race shocks deliver performance but need regular maintenance to stay at their best.

Ready to order?

Shop with confidence at Scenders — premium cycling parts, fast shipping.

View Full Product