RockShox Air Shaft - Lyrik B1/Yari SA 180
RockShox

RockShox Air Shaft - Lyrik B1/Yari SA 180

$40.00
In Stock

OEM RockShox Solo Air replacement shaft for Lyrik B1 and Yari forks (180mm, 27.5 only). Restores air spring function and small-bump sensitivity for enduro use.

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Product Details

Overview & Technology

RockShox Air Shaft — precision replacement for Lyrik B1/Yari (180mm, 27.5 only). This OEM air shaft (Mfg. P/N 11.4018.026.020, SKU 942417) is the core of the Solo Air spring assembly, CNC-machined for exact tolerances and finished to RockShox's factory specifications. It reestablishes the calibrated positive/negative chamber balance that gives the Lyrik/Yari their characteristic small-bump sensitivity, mid-stroke support, and linear ramp toward bottom-out. The shaft is manufactured from high-grade aluminum with a hard-anodized wear surface and precision sealing interfaces. In real-world riding this means smoother action, consistent air spring feel ride after ride, and predictable progression under heavy loads — critical for aggressive enduro and gravity riding where a properly functioning air spring directly affects traction, control, and confidence.

Key Features & Benefits

What you get with the RockShox Lyrik/Yari Air Shaft: • OEM fit and finish: Direct replacement part manufactured to factory tolerances for an exact rebuild of the Solo Air system. • Hard-anodized aluminum shaft: Durable surface resists scoring and wear from seals and foam rings for longer service life. • Optimized air chamber geometry: Restores small-bump compliance and controlled ramping—improves grip on technical descents and reduces harsh bottom-outs. Installing a fresh air shaft during a lower leg service or full fork rebuild eliminates internal wear variables and helps maintain consistent damping and air spring performance — especially important for heavy, high-mileage enduro use where internal tolerances have tightened over time.

Fit, Compatibility & Installation

Compatibility: This air shaft is specifically for RockShox Lyrik B1 and Yari forks with 180mm travel on 27.5" wheels only. It is not compatible with other Lyrik/Yari travel lengths, B2/C2 generations, or 29" specific models. Reference Mfg. P/N 11.4018.026.020 when ordering to ensure exact fit. Installation notes: Replacement requires partial disassembly of the fork (lower leg and air spring removal). Install with clean lubrication, replace air seals and foam rings at the same service interval, and follow RockShox torque specs and bleed procedures. If you’re not comfortable with internal fork service, have a certified suspension tech perform the install to ensure proper sealing and air-pressure calibration.

Who This Part Is For

This air shaft is aimed at enduro and aggressive trail riders running Lyrik B1 or Yari forks in 180mm/27.5" configuration who need a factory-correct replacement to regain original Solo Air performance. It’s ideal when you’ve hit service intervals, noticed degraded small-bump sensitivity, or have scoring/wear on the original shaft. Mechanics in pro shops and home wrenchers rebuilding forks will value this as a must-have stock item for accurate rebuilds. If you ride hard, carry gear, or run heavier setups and demand consistent fork behavior on steep, technical terrain, installing a fresh air shaft is a high-impact service upgrade.

Key Features

  • ✓ OEM RockShox replacement air shaft for Solo Air spring system
  • ✓ Specifically for Lyrik B1 & Yari forks, 180mm travel, 27.5" only
  • ✓ CNC-machined aluminum core with hard-anodized wear surface
  • ✓ Restores small-bump sensitivity and controlled bottom-out ramp
  • ✓ Factory part number 11.4018.026.020 for exact compatibility
  • ✓ Lightweight, low-friction design improves fork consistency
  • ✓ Perfect for service kits and professional fork rebuilds

Specifications

Misc Lyrik B1/Yari (180mm 27.5 only)

Product Identifiers

Vendor Item # 11.4018.026.020
UPC 710845776694

Frequently Asked Questions

Is this air shaft compatible with 29" Lyrik or Yari forks?

No. This shaft is only compatible with Lyrik B1 and Yari forks set up for 180mm travel in 27.5" wheel configuration. Check your fork generation and travel spec before ordering; different travel lengths and 29" models use different shafts and internal geometries.

Can I install this myself or should a shop do it?

If you have experience servicing suspension and the correct tools, you can install it at home following RockShox service manuals and torque specs. However, replacing the air shaft involves disassembling the air spring and seals — if you’re unsure, have a qualified suspension technician install it to guarantee proper sealing and function.

Do I need other parts when replacing the air shaft?

We strongly recommend replacing air seals, foam rings, and O-rings during the service. These wear items directly affect sealing and performance; fresh seals paired with a new shaft ensure long-term reliability. Forest Bikes sells full lower-leg and air spring service kits for Lyrik/Yari.

How often should I replace the air shaft?

A shaft itself doesn’t have a fixed interval, but inspect during every lower-leg service (every 50–100 hours depending on conditions). Replace if you see scoring, wear, or if performance has degraded despite correct air pressure and damping settings.

Will this part affect my spring curve or bottom-out behavior?

Yes — installing the correct OEM air shaft restores the Solo Air chamber geometry, which governs small-bump compliance and progression. If your previous shaft was worn, a new shaft will make the fork feel more consistent and predictable, with improved bottom-out control.

Buying Guide

When buying an internal fork part like an air shaft, always match manufacturer part numbers and the exact fork configuration (travel, wheel size, generation). Choosing OEM components ensures fit, material compatibility, and engineering tolerances that aftermarket reproductions may not guarantee. Plan to purchase seal kits and any recommended consumables with the shaft so you can perform a complete service. If you ride in muddy or high-hour conditions, consider scheduling the replacement with a professional suspension shop to calibrate pressures and damping after installation.

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