RockShox 80mm Shaft for SID/Reba 2013-17
80mm Shaft for SID/Reba 2013-17
80mm Shaft for SID/Reba 2013-17
RockShox

RockShox 80mm Shaft for SID/Reba 2013-17

$35.00
In Stock

OEM 80mm Solo Air shaft kit for RockShox SID B and Reba forks (2013–2017). Includes air shaft, piston and seal to restore air-spring performance and reliability.

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Available Options

Option Price Availability
Rockshox, Solo Air shaft, 100mm for SID B A2-A4(2013-2016)/Reba A3-A7(2013-2017) 27.5"/29" $35.00 In Stock
RockShox, SID B/Reba 120 Air Shaft Solo Air 27.5", 29" $35.00 In Stock
Rockshox, Solo Air shaft, 120mm for RS-1/ SID B A2-A4/Reba A3-A7/RS-1 26" $35.00 In Stock

Product Details

Overview & Technology

Direct OEM replacement Solo Air shaft for RockShox SID B and Reba forks. This kit replaces the internal air shaft assembly — the precision-machined aluminium shaft, piston and sealing stack — restoring the fork's spring function and airtight performance. It carries RockShox manufacturer part number 11.4018.021.002 and SRAM model ID FS-SPP-A0. The shaft and piston are CNC-machined from high-grade aluminium for straightness and low friction, while the included seal is a durable elastomer designed to hold air pressure and resist oil contamination. Swapping a worn shaft and seal eliminates air loss, inconsistent sag and felt harshness, bringing back the fork’s factory spring curve and sensitivity.

Key Features & Benefits

What’s in the kit: air shaft, piston and sealing assembly — everything needed to rebuild the Solo Air spring section. The components are finished and toleranced to RockShox OEM standards for reliable fit and long life. • Precision aluminium shaft: rigid, lightweight and straight to maintain smooth stroke and avoid binding. • Factory piston: engineered to preserve the original Solo Air spring curve and air-volume behaviour. • High-performance seals: resist oil swell and maintain airtight performance under repeated use. • OEM fitment: designed specifically for SID B A2–A4 (2013–2016) and Reba A3–A7 (2013–2017) Solo Air forks. Real-world benefit: swapping the shaft and seal returns lost sensitivity, improves tunability and prevents air leaks that leave you fighting inconsistent sag on trail rides and races.

Fit, Compatibility & Installation

This 80mm Solo Air shaft is compatible with RockShox SID B A2–A4 (2013–2016) and Reba A3–A7 (2013–2017) that use the Solo Air spring. It is a direct-fit OEM replacement when your fork uses an 80mm shaft length. Not compatible with pre-2014 A3 29" configurations or non-Solo Air models. Always verify your fork's model year and internal configuration before ordering. Installation requires standard suspension service tools and a clean workspace: torque wrench, snap-ring pliers (if applicable), fork oil, and an assembly vise or service stand. If you’re not comfortable with internal fork work, we recommend a qualified suspension tech or Forest Bikes service partner to ensure air spring spacing and torque specs are correct. Shipping & weight: package dimensions 9" x 3" x 1.2", weight 0.05 lb — small, lightweight replacement part shipped quickly.

Who This Part Is For

This shaft kit is for mountain riders who own a RockShox SID B or Reba fork from the 2013–2017 era and need a reliable air-spring rebuild. It's ideal if you’re experiencing air leakage, inconsistent sag, or a harsh top-out and mid-stroke caused by worn seals or a damaged shaft. Also great for home mechanics, race teams and bike shops performing scheduled maintenance or restoring older forks to like-new performance. If you want the factory feel back in your front suspension without replacing the entire fork, this OEM shaft kit is a cost-effective solution.

Key Features

  • ✓ OEM RockShox replacement kit: shaft, piston and seal included
  • ✓ Precision CNC-machined aluminium shaft for straightness and low friction
  • ✓ Seals engineered to hold Solo Air pressure and resist oil contamination
  • ✓ Direct fit for SID B A2–A4 (2013–2016) and Reba A3–A7 (2013–2017)
  • ✓ Restores factory spring curve, sensitivity and consistent sag
  • ✓ SRAM model ID FS-SPP-A0 and RockShox part 11.4018.021.002
  • ✓ Lightweight, small package — easy to stock for shop repairs

Product Identifiers

Vendor Item # 11.4018.021.002
UPC 710845724251

Frequently Asked Questions

Is this shaft compatible with my 2014 SID or Reba?

Yes — this 80mm Solo Air shaft is compatible with RockShox SID B A2–A4 (2013–2016) and Reba A3–A7 (2013–2017) models that use the Solo Air spring. Confirm your fork uses Solo Air and matches the model year range before ordering.

Can I use this on 29" A3+ or pre-2014 A3 forks?

No. The kit description notes incompatibility with pre-2014 A3 29" configurations and specific A3+ 29" setups. If you have an A3 29" variant or are unsure, check your fork’s service manual or fork crown/sticker ID to avoid the wrong part.

What tools are needed to install the air shaft?

Basic suspension service tools are required: torque wrench, hex/allen set, snap-ring pliers (if applicable), fork oil, clean rags and a service stand or assembly vise. Correct torque specs and clean assembly are essential; if you’re not confident, have a trained suspension tech do the swap.

Does this kit include lower leg seals or damper components?

No — this kit is focused on the Solo Air spring: the shaft, piston and internal air seal. Lower leg seals and damper internals are separate service items and should be ordered if you need a full fork service.

How often should the air shaft and seals be replaced?

Replace seals and inspect the shaft every 1–2 years or after 100–200 hours of riding depending on conditions. Frequent wet, gritty or muddy riding accelerates wear; any sign of air loss, inconsistent sag or unusual noise means it’s time to service the air spring.

Is this an OEM RockShox part and what is the part number?

Yes, this is an OEM RockShox shaft kit with manufacturer part number 11.4018.021.002 and internal product SKU 942293. SRAM model ID for reference is FS-SPP-A0.

Buying Guide

When buying an air-shaft kit for RockShox forks, the most important checks are fork model, spring type and required shaft length. SID and Reba forks from different years and trim levels used varying internal configurations — selecting the correct OEM part number (11.4018.021.002) and SRAM model ID (FS-SPP-A0) avoids fitment mistakes. If your fork uses Solo Air and the correct shaft length is 80mm, this kit will restore the air-spring internals. Decide whether you need only the air shaft assembly or a full service: seals and piston address air leaks and spring issues, but worn bushings, oil contamination or damper wear will require additional kits. If you’re unsure, bring your fork to a certified suspension tech or contact Forest Bikes customer service with your fork’s stamped model/year information for guidance.

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