RockShox Air Shaft - Sid B1 80-29
RockShox

RockShox Air Shaft - Sid B1 80-29

$43.00
In Stock

OEM RockShox Solo Air shaft for SID B1 / SID RLC A1 80mm 29er forks (2018+). Direct-fit replacement to restore air spring performance and ride quality.

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

Product Details

Overview & Technology

RockShox Air Shaft - SID B1 80-29 (Mfg. Part # 11.4018.026.023) is the OEM Solo Air replacement shaft designed for 2018 and later SID RLC A1, SID XX, RL B1 and Reba A7 forks with 80mm travel on 29" wheels. Built to the factory specification, this air shaft restores the internal geometry and pressure dynamics of your SID's Solo Air spring — essential when rebuilding or repairing your fork. The shaft is manufactured to RockShox tolerances with precision-machined aluminum and sealed interfaces to maintain consistent damping and reliable air spring performance. Using the correct OEM shaft keeps air volume, negative/positive chamber relationships and overall spring curve true to stock behavior, delivering predictable small-bump sensitivity and mid-stroke support.

Key Features & Benefits

Direct OEM replacement: restores factory Solo Air characteristics for consistent travel, platform and responsiveness. Ideal for rebuilds or when internal damage or wear affects fork feel. Real-world benefits: • Restores stock air-volume and spring curve for original ride quality. • Precision machined to maintain seal alignment and reduce stiction. • Lightweight construction keeps unsprung mass low for snappy handling. • Compact shipping size and low weight (0.1 lb) make it easy to keep a spare on hand.

Fit, Compatibility & Installation

This shaft is compatible with SID RLC A1, SID XX, RL B1 and Reba A7 forks with 80mm travel on 29" wheels produced from 2018 onward. Confirm compatibility by matching your fork model/year and RockShox part number (11.4018.026.023) before purchase. The product listing variant is labeled Air Shaft, SID B1, 80-29. Installation requires fork disassembly — removal of the upper leg and damper cartridge — and precise reassembly with new seals and the correct suspension fluid. For best results, install as part of a full service using the appropriate RockShox service kit (seals and oils). If you're not comfortable with internal fork work, have a certified suspension tech perform the replacement to preserve performance and safety.

Who This Part Is For

Designed for cross-country riders, racers and enthusiasts who own a compatible RockShox SID or Reba fork and need a reliable OEM air spring component. This part is perfect for mechanics doing scheduled maintenance, shops stocking common SID service parts, and riders aiming to bring a worn or damaged fork back to factory feel. If your fork shows excessive air spring wear, inconsistent sag, or feels harsh on small bumps after years of use, replacing the air shaft along with seals and fluid will usually restore the fork’s original sensitivity and pedaling support.

Key Features

  • ✓ OEM RockShox Solo Air shaft for SID B1 80mm 29er forks (2018+)
  • ✓ Factory part number 11.4018.026.023 ensures direct-fit compatibility
  • ✓ Precision-machined aluminum construction for low friction
  • ✓ Restores stock air-volume and spring curve for original ride feel
  • ✓ Lightweight replacement — shipping weight approx. 0.1 lb
  • ✓ Best installed with seals and full fork service for reliability
  • ✓ Ideal spare part for shops and serious XC riders

Specifications

Misc SID RLC A1/SID XX/RL B1/Reba A7 80mm 29

Product Identifiers

Vendor Item # 11.4018.026.023
UPC 710845788994

Frequently Asked Questions

Which forks is this air shaft compatible with?

This shaft fits RockShox SID RLC A1, SID XX, RL B1 and Reba A7 forks with 80mm travel on 29" wheels from 2018 onward. Always confirm your fork model/year and match the part number (11.4018.026.023) before ordering.

Can I install this air shaft myself?

Installing the air shaft requires disassembling the upper leg and damper cartridge and following RockShox torque and lubrication specs. Experienced home mechanics can perform the swap, but if you're not confident, have a qualified suspension tech do the job to avoid damage and ensure proper sealing.

Do I need any other parts to complete the service?

Yes — we recommend replacing dust seals, foam rings and lubrication as part of a full service. Use the appropriate RockShox service kit and suspension fluid for your fork model to ensure correct performance and longevity.

How will replacing the air shaft affect fork performance?

A fresh OEM shaft restores the correct air volume balance and chamber behavior, returning small-bump sensitivity, mid-stroke support and predictable sag. It eliminates inconsistencies that can occur from worn or damaged internal components.

Is this an OEM part or an aftermarket equivalent?

This is an OEM RockShox air shaft sold under manufacturer part number 11.4018.026.023. Using OEM components maintains factory tolerances and compatibility, which is important for suspension performance.

What should I check before ordering?

Verify your fork model, travel (80mm), wheel size (29"), and production year (2018+). Cross-check the RockShox part number and, if possible, consult your fork’s service manual or a dealer to confirm fitment.

Buying Guide

When buying fork air-spring parts, always match the part number, fork model, travel and wheel size. RockShox uses specific air-shaft geometries to set air-volume and positive/negative chamber relationships, so swapping non-matching components can change spring curve and handling. Plan to purchase a service kit (seals/foam/oil) alongside the air shaft — replacing seals and lubricants at the same time ensures a reliable rebuild and minimizes downtime. If you’re maintaining multiple forks or a busy shop, keep common OEM shafts and seal kits in stock for quick turnarounds.

Ready to order?

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

View Full Product