RockShox Air Spring Top Cap - 35mm - 0.5mm Thread Pitch - Splined

$30.00

In Stock

OEM RockShox 35mm splined air spring top cap with 0.5mm thread pitch — durable, service-ready replacement that includes the valve cover for direct fit on select RockShox forks.

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Product Details

Air Spring Top Cap — Overview & Technology

RockShox OEM top cap engineered for reliable air spring service. This 35mm splined top cap (0.5mm thread pitch) is designed as a direct replacement for RockShox 35mm air spring assemblies. The part includes the splined top cap and a protective valve cover for the Schrader/air valve area, restoring proper sealing and serviceability after teardown or damage. The cap is precision machined to tight tolerances so threads engage cleanly and the splined drive interface accepts the correct service tool without rounding. A corrosion-resistant anodized finish and a precisely formed sealing area improve durability and reduce the chance of air leaks, keeping your fork consistent and confidence-inspiring on every trail run.

Key Features

Built to RockShox specifications for fit, function and longevity. • Diameter & thread: 35mm outer diameter with fine 0.5mm thread pitch for secure engagement. • Splined interface: Splined top cap design for positive tool engagement during service and accurate alignment. • Includes valve cover: Protective valve cover included to shield the valve and keep contaminants out. • OEM fit: RockShox part number 11.4018.083.000 / SRAM FS-SPP-A0 — exact replacement for listed models. • Precision construction: CNC-machined aluminum alloy with an anodized finish for corrosion resistance and long life.

Fit & Compatibility

This top cap is specified for 35mm RockShox forks using the Boost 15x110 layout and is compatible with the following models: Lyrik A1+, Yari A1+, Pike B1+, Revelation A1+ (35mm), Boxxer 35mm and SID35mm. Always verify your fork's air spring diameter and model designation (A1+, B1+, etc.) before ordering. Compatibility depends on the air spring size and thread pitch — this piece uses a 0.5mm thread pitch. If your fork uses a different air spring diameter or thread standard, this cap will not fit and may damage the threads. When in doubt consult your fork's service manual or contact us with your fork model and serial number for confirmation.

Who This Part Is For

This is a must-have spare for mountain bikers who maintain their forks themselves, plus bike shops and suspension techs who service RockShox forks regularly. It's ideal if you've lost or damaged the top cap during service, need to replace a stripped cap, or want an OEM-quality part to return a fork to factory specification. Riders who value consistent suspension performance — from trail riders to aggressive all-mountain and enduro riders using 35mm RockShox forks — will appreciate the peace of mind an OEM top cap provides when rebuilding or servicing the air spring.

Key Features

✓ Direct OEM replacement for RockShox 35mm air spring assemblies
✓ 35mm diameter with precise 0.5mm fine thread pitch
✓ Splined top cap for secure tool engagement during service
✓ Includes protective valve cover to shield the air valve
✓ CNC-machined aluminum alloy construction with anodized finish
✓ Compatible with Lyrik, Yari, Pike, Revelation, Boxxer and SID35mm
✓ SRAM model ID FS-SPP-A0 / RockShox part 11.4018.083.000

Product Identifiers

Vendor Item #	11.4018.083.000
UPC	710845812453

Frequently Asked Questions

Will this top cap fit my fork?

This top cap fits RockShox forks with a 35mm air spring and 0.5mm thread pitch — specifically Lyrik A1+, Yari A1+, Pike B1+, Revelation A1+ (35mm), Boxxer 35mm and SID35mm. Confirm your fork's air spring diameter and model designation before purchase.

Does the part include the valve cover?

Yes. The unit ships with the splined top cap and the valve cover, so you'll have the protective cap that covers the air valve for a complete top-end service piece.

Do I need a special tool to remove/install the splined top cap?

Yes. The splined top cap requires the appropriate RockShox spline driver or compatible spline tool to engage the cap without damage. Using the wrong tool or excessive force can round splines or damage threads.

Why is thread pitch important?

Thread pitch must match the fork's mating threads exactly. The 0.5mm fine pitch on this cap ensures proper engagement and sealing; incorrect pitch can cross-thread or strip the fork, causing costly damage.

Can I install this myself?

Experienced home mechanics can install this cap as part of an air spring service, provided they have the correct spline driver and follow RockShox service procedures. If unsure, have a qualified shop or suspension tech perform the work.

Is this an OEM RockShox part?

Yes — listed as RockShox part number 11.4018.083.000 and SRAM model ID FS-SPP-A0. It's manufactured to OEM specifications for fit and function.

Buying Guide

When buying an air spring top cap, first confirm your fork's air spring diameter, thread pitch and model code. Measure the outer diameter of the air spring cap area or check the service manual — this part is specifically 35mm with a 0.5mm thread pitch and splined drive. Ordering the correct part avoids cross-threading and fitment issues. Decide between OEM and aftermarket based on your priorities: OEM caps like this RockShox unit guarantee exact fit and finish and typically include the valve cover. If you service forks often, also pick up the matching air spring service kit (seals, foam rings and o-rings) and the correct splined tool to keep installs clean and damage-free.

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