RockShox DLX Ult/SDLX Thru Damper Shaft

$30.00

In Stock

OEM replacement damper shaft for RockShox Deluxe Ultimate RCT (2023+) and Super Deluxe ThruShaft C1 (2022+). Precision-ground chromoly shaft restores factory damping performance and reliability.

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Product Details

Overview & Technology

RockShox DLX Ult/SDLX Thru Damper Shaft (Part No. 11.4118.105.625 / Manufacturer PN 943063) is the OEM replacement shaft for Deluxe Ultimate RCT (B2–C1) 2023+ and Super Deluxe ThruShaft C1 2022+ rear shocks. Manufactured to RockShox factory specifications and identified by SRAM Model ID RS-SPP-A0, this damper shaft is engineered to restore the original damping characteristics after wear or damage. The shaft is precision ground from high-strength chromoly-grade steel and finished with a corrosion-resistant coating to protect against moisture and grit commonly encountered on the trail. Tight tolerances and a straightness spec matched to the stock damper ensure smooth piston travel and stable rebound/compression control throughout the shock’s service life.

Key Features & Benefits

Built to OEM standards: This damper shaft is a direct-fit RockShox replacement, made for workshops and riders who want the factory spec part when rebuilding or repairing a rear shock. Using an original shaft preserves damper geometry and performance curves set by the manufacturer. • Material: Precision-ground chromoly steel for strength and rigidity. • Finish: Corrosion-resistant coating for long-term durability in wet, muddy conditions. • Fitment: OEM dimensions and tolerances for plug-and-play installation into DLX Ult and SDLX Thru shocks. • Lightweight packaging: Ships small and light—6" x 5.25" x 1.2", 0.1 lb—so you get fast delivery.

Fit, Compatibility & Installation Notes

This damper shaft is specifically designed for RockShox Deluxe Ultimate RCT (B2–C1) 2023+ and Super Deluxe ThruShaft C1 (2022+) rear shocks. Confirm compatibility by matching the part number (11.4118.105.625) or SRAM model ID RS-SPP-A0 with your shock's service documentation. It replaces the factory shaft without modification when your shock’s internals still meet rebuild criteria. Installation should be performed as part of a complete damper service or shaft replacement kit—this part includes the shaft only. Replace seals, o-rings, bushings and fluids per RockShox service manual. Professional shop tools and torque settings are recommended to avoid damage or improper assembly that could affect damping performance.

Who This Part Is For

This damper shaft is aimed at mountain bikers, race teams, and independent mechanics who service RockShox rear shocks. If your Super Deluxe ThruShaft or Deluxe Ultimate shows binding, uneven damping, excess play, or visible shaft damage, swapping in an OEM shaft restores smooth piston action and corrects performance issues related to a worn or bent shaft. It’s also ideal for bike shops performing routine overhauls, riders building a long-term spare-parts kit, and anyone insisting on OEM-spec components for reliability and resale value.

Key Features

✓ OEM RockShox replacement damper shaft, part 11.4118.105.625
✓ Fits Deluxe Ultimate RCT (B2–C1) 2023+ and Super Deluxe ThruShaft C1 2022+
✓ Precision-ground chromoly steel for rigidity and consistent damping
✓ Corrosion-resistant finish to resist moisture and trail contamination
✓ SRAM Model ID RS-SPP-A0 for quick compatibility checks
✓ Direct-fit shaft-only replacement—ideal for workshop rebuilds
✓ Ships compact and lightweight: 6" x 5.25" x 1.2", 0.1 lb

Product Identifiers

Vendor Item #	11.4118.105.625
UPC	710845880599

Frequently Asked Questions

Will this damper shaft fit my RockShox Super Deluxe ThruShaft?

Yes — this shaft is the OEM replacement for Super Deluxe ThruShaft C1 models from 2022 onwards. Confirm fit by checking the part number 11.4118.105.625 or SRAM Model ID RS-SPP-A0 against your shock’s service documentation.

Is this a complete damper rebuild kit or the shaft only?

This listing is for the damper shaft only. It does not include seals, o-rings, bushings, or fluid. RockShox recommends replacing seals and fluids whenever internal components are serviced to ensure reliable operation.

Can I install this shaft at home or do I need a shop?

A competent home mechanic with the correct RockShox service manual and basic shock tools can replace the shaft, but professional shops have the presses, torque tools and clean environment to ensure a leak-free, correctly tuned rebuild.

What materials and treatments are used on the shaft?

The shaft is precision-ground from high-strength chromoly-grade steel and finished with a corrosion-resistant coating to resist trail contaminants and moisture, helping retain straightness and smooth piston travel.

How do I know if my shaft needs replacing?

Replace the shaft if you see visible bends, scoring, excessive corrosion, or if the shock shows binding, inconsistent damping, or internal play. During routine damper service, inspect the shaft before reassembly and replace if any wear is present.

Is this an OEM RockShox part with warranty?

This is an OEM RockShox replacement part (11.4118.105.625). Warranty coverage depends on the seller and original manufacturer terms—check Forest Bikes’ warranty and RockShox’s service policies for details.

Buying Guide

When buying a replacement damper shaft, prioritize OEM parts to maintain factory damping behavior, tolerances and longevity. Match the part number and model year carefully—RockShox made several damper revisions across model years, and using the correct shaft preserves piston alignment and seal life. Plan to replace seals, foam rings and fluid at the same time. A shaft-only swap can solve issues from bent or scored rods, but a full damper service ensures reliable performance and prevents premature wear of the new shaft.

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