RockShox Air Top Cap
RockShox

RockShox Air Top Cap

$30.00
In Stock

OEM RockShox 32mm air top cap for aluminum upper forks — direct-fit replacement for Reba, SID, Revelation, RS-1 and Bluto models. Bottomless-token compatible for easy negative-volume tuning.

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Product Details

Overview & Technology

RockShox Air Top Cap (32mm) is an OEM fork service part designed to restore proper air spring function on select RockShox forks with aluminum upper tubes. This top cap replaces worn or damaged factory caps and maintains factory tolerances for reliable air sealing and performance. The cap is machined for durability and precise fitment, and is bottomless token compatible, allowing you to keep or tweak negative-volume tokens when servicing the fork. It carries RockShox Manufacturer Part # 11.4018.012.006 and SRAM Model ID FS-SPP-A0.

Key Features & Construction

Constructed to OEM standards for RockShox forks, this top cap is intended for use on forks with 32mm diameter air spring housings and aluminum upper tubes only. The cap's materials and machining deliver the tight tolerances needed for consistent air spring performance and long-term durability. • Material: Precision-machined alloy compatible with aluminum stanchions. • Compatibility: Reba A1–A5, SID A1–A4, Revelation A1–A4, RS-1 A+, Bluto A1+, Argyle A1+. • Service-ready: Keeps bottomless tokens and internal geometry intact for simple rebuilds.

Fit, Compatibility & Installation Notes

This part is a direct replacement for the listed RockShox models when those forks use 32mm air spring housings and aluminum upper tubes. It is not specified for magnesium or alternative upper materials — confirm your fork's upper-tube material before ordering. Shipping dimensions are compact (4" x 1.3" x 1") and weight is light (0.04 lb). Installation should be performed during a standard fork service or by a qualified mechanic; basic tools and a factory service manual are recommended to ensure correct torque and sealing. Keep bottomless tokens in place if you want to retain your current negative-volume settings.

Who This Part Is For

This air top cap is for mountain bikers, mechanics, and home-wrenchers who need an OEM-quality replacement or spare for RockShox forks. If you ride with Reba, SID, Revelation, RS-1, Bluto or Argyle forks and use aluminum upper tubes, this cap restores factory air-spring function. It's also great for trail riders and racers who perform regular fork services and want to maintain correct air pressures, spring feel, and compatibility with bottomless tokens without changing internal geometry.

Key Features

  • ✓ OEM RockShox top cap, Manufacturer Part # 11.4018.012.006
  • ✓ Designed for 32mm air spring housings on aluminum uppers
  • ✓ Direct fit for Reba A1–A5, SID A1–A4, Revelation A1–A4
  • ✓ Compatible with RS-1 A+, Bluto A1+ and Argyle A1+ forks
  • ✓ Bottomless-token compatible — preserves negative-volume tuning
  • ✓ Lightweight, precision-machined alloy construction for durability
  • ✓ SRAM Model ID FS-SPP-A0 for easy parts lookup
  • ✓ Compact shipping size: 4" x 1.3" x 1"; weight 0.04 lb

Product Identifiers

Vendor Item # 11.4018.012.006
UPC 710845751233

Frequently Asked Questions

Is this top cap compatible with my fork?

This 32mm Air Top Cap fits RockShox forks that use 32mm air spring housings and aluminum upper tubes, including Reba A1–A5, SID A1–A4, Revelation A1–A4, RS-1 A+, Bluto A1+, and Argyle A1+. Verify your fork model and upper-tube material before purchasing; it is not intended for magnesium or non-aluminum uppers unless explicitly specified by RockShox.

Can I keep my bottomless tokens when I install this cap?

Yes — the cap is bottomless-token compatible, so you can retain or move tokens during service to fine-tune negative spring volume. Tokens sit inside the air spring and the cap is designed to accommodate them without altering original fitment.

Do I need special tools to install the air top cap?

Basic suspension service tools and the fork's factory service manual are recommended. Depending on your fork, you may need a torque wrench, appropriate hex sockets, and clean lubrication. If you’re not comfortable with fork service, have a qualified shop perform the replacement to ensure proper sealing and torque settings.

Will this improve my fork’s performance?

A worn, damaged, or leaking top cap can degrade air spring performance. Replacing it with an OEM RockShox cap restores correct sealing and air spring behavior, helping the fork hold pressure, retain sag settings, and maintain consistent responsiveness.

What is the difference between caps for aluminum and magnesium uppers?

Caps are often machined to match the material and dimensions of the fork's upper tube. This particular cap is specified for aluminum uppers; using a cap intended for aluminum on a magnesium upper (or vice versa) can result in improper fit or sealing. Always use the cap specified for your fork's upper-tube material.

Where can I find the RockShox part numbers for reference?

This product carries RockShox Part # 11.4018.012.006 and SRAM Model ID FS-SPP-A0. Use those identifiers when cross-referencing in service manuals, parts lists, or when ordering from dealers to ensure exact compatibility.

Buying Guide

When replacing a fork air top cap, always match the part to your fork's model and upper-tube material. Choose OEM parts like this RockShox cap for exact tolerances and compatibility with internal components such as bottomless tokens. Check manufacturer part numbers (11.4018.012.006) and SRAM model IDs (FS-SPP-A0) to avoid cross-fit errors. If you perform regular fork servicing, keep spare top caps on hand to minimize downtime. If you’re unsure about fit or installation, a certified suspension tech can confirm compatibility and complete the service safely.

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