RockShox Fork Internals Explained:What’s Inside Select, Select+, and Ultimate?

5th February 2025 Andy Gartside

If you’re serious about MTB suspension, knowing the internals of your RockShox fork can make a huge difference when tuning your ride. From dampers to air springs, RockShox uses different tech across Select, Select+, and Ultimate models—so let’s break down what’s happening inside!

Key Fork Internals: Dampers, Air Springs & Features

Every RockShox suspension fork has three main internal components:

1️⃣ The Damper – Controls how the fork absorbs impacts and rebounds
2️⃣ The Air Spring – Determines how the fork compresses under force
3️⃣ Additional Technologies – Things like ButterCups, Charger upgrades, and friction-reducing coatings

Each model—Select, Select+, and Ultimate—has different versions of these components, leading to big differences in feel and adjustability.

RockShox Dampers: The Brain of the Fork

The damper is responsible for controlling how fast the fork compresses and rebounds. More advanced dampers = more tuning options and better performance.

Motion Control Damper (Entry-Level / Base Models)

✅ Found on budget RockShox forks (like Recon, 35, lower-end Pike)
✅ Simple rebound adjustment + basic compression dial
✅ No independent high-speed/low-speed compression tuning
✅ Feels less refined over rough terrain

💡 Best for: Beginners or those who don’t need much suspension tuning.

Charger RL/RC (Found in Select & Some Select+ Models)

✅ Mid-range damper, found in forks like Pike Select, Lyrik Select
✅ Uses a sealed cartridge design for better damping control
✅ Rebound + limited compression adjustment
✅ Less tuning than higher-end dampers, but still much better than Motion Control

💡 Best for: Riders who want solid performance without deep tuning complexity.

Charger 2.1 RC2 (Some Select+ & Older Ultimate Forks)

✅ Upgraded version of the Charger damper
✅ High-speed & low-speed compression adjustment
✅ More refined oil flow = better small bump sensitivity
✅ Found on higher-end Select+ models & older Ultimate forks

💡 Best for: Riders who want a more controlled ride with compression tuning.

Charger 3 RC2 (Found in Ultimate Models – 2023)

🔥 The most advanced RockShox damper until 2024
✅ Completely redesigned for more independent tuning
✅ Independent High-Speed & Low-Speed Compression
✅ Less cross-talk between settings = smoother ride over mixed terrain
✅ Less friction, more control, and buttery smooth damping
✅ Used in Ultimate versions of Pike, Lyrik, and ZEB

💡 Best for: Aggressive riders, racers, and those who want maximum adjustability.

Charger 3.1 RC2 (Newest 2024-2025 Model – Found in Some Ultimate Forks & Flight Attendant Models)

🔥 The latest evolution of Charger 3, with more fine-tuning
✅ Improved oil flow for smoother transitions between compression stages
✅ More refined independent High-Speed & Low-Speed Compression control
✅ More support for hard hits while keeping small bump compliance
✅ Compatible with Flight Attendant electronic suspension on select models
✅ Lighter weight and more efficient internals

💡 Best for: Racers and high-performance riders looking for ultimate control in varied terrain.

RockShox Air Springs: How They Affect Ride Feel

Solo Air (Entry-Level & Select Models)

✅ Single chamber system – keeps weight low
✅ Air pressure determines both initial stroke & end-stroke support
✅ Found in lower-end forks & some Select models

💡 Pros: Simple, lightweight.
💡 Cons: Less mid-stroke support compared to DebonAir+.

DebonAir (Select & Select+ Models)

✅ Larger negative air chamber = better small bump compliance
✅ More linear feel, reducing harsh bottom-outs
✅ Used in many mid-range forks (Pike, Lyrik, ZEB Select & Select+)

💡 Pros: More supple and plush ride.
💡 Cons: Can feel too linear for aggressive riders.

DebonAir+ (Ultimate Models & High-End Select+ Forks)

🔥 The latest RockShox air spring technology 🔥
✅ Increased mid-stroke support for a more controlled feel
✅ Improved small bump sensitivity and more bottom-out resistance
✅ Used in Ultimate versions of Pike, Lyrik, ZEB, and SID

💡 Best for: Riders who want a plush start, supportive middle, and controlled end stroke.

ButterCups: What Are They & Why Do They Matter?

✅ Found only in Ultimate forks (Pike, Lyrik & ZEB Ultimate)
✅ Small rubber pucks inside the lower legs
✅ Absorb trail chatter and vibrations before they reach your hands
✅ Reduces hand fatigue and makes long descents more comfortable

💡 Best for: Riders who ride rough terrain or long descents and want less hand fatigue.

Friction-Reducing Coatings: Select vs. Ultimate

Fast Black Coating (Select & Select+)

✔ Basic stanchion coating – smooth but not the best
✔ Used on Select and Select+ models

Ultimate Black / Kashima-like Coating (Ultimate)

🔥 Extra slick for reduced friction
🔥 Used in Ultimate models
🔥 Increases small bump sensitivity

💡 Best for: Riders looking for extra smooth performance with less stiction.

Summary: Which RockShox Model Should You Get?

Feature	Select	Select+	Ultimate (Charger 3)	Ultimate (Charger 3.1)
Damper	Charger RL/RC	Charger 2.1 (Some)	Charger 3 RC2	Charger 3.1 RC2
Compression Adjust	Low-speed only	Some high-speed	Full high/low-speed	Refined high/low-speed
Rebound Adjust	Yes	Yes	Yes	Yes
Air Spring	DebonAir	DebonAir	DebonAir+	DebonAir+
ButterCups	❌ No	❌ No	✅ Yes	✅ Yes
Friction Coating	Fast Black	Fast Black	Premium Coating	Premium Coating
Flight Attendant	❌ No	❌ No	❌ No	✅ Some Models

Final Verdict: Which Model Is Best for You?

🔹 Budget Riders & Beginners → Select – solid performance, no frills.
🔹 Intermediate Riders → Select+ – better damper, more adjustability.
🔹 Advanced Riders & Racers → Ultimate (Charger 3) – best tuning, control & small bump compliance.
🔹 Tech-Savvy Racers → Ultimate (Charger 3.1) – the latest fine-tuned performance with Flight Attendant options.