RockShox DLX Ult C1 Damper Shaft Assy
DLX Ult C1 Damper Shaft Assy
DLX Ult C1 Damper Shaft Assy
RockShox

RockShox DLX Ult C1 Damper Shaft Assy

$64.00
In Stock

OEM replacement damper shaft assembly for RockShox Deluxe Ultimate RCT (C1) 2023+ — includes shaft, poker and rebound rod. Precision fit for reliable rebound control and longer service intervals.

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

Available Options

Option Price Availability
RockShox, Damper Shaft for DLX Ult C1, 37.5-45mm $64.00 In Stock
RockShox, Damper Shaft for DLX Ult C1, 47.5-55mm $64.00 In Stock
RockShox, Damper Shaft for DLX Ult C1, 57.5-65mm $64.00 In Stock

Product Details

Overview & Technology

RockShox DLX Ult C1 Damper Shaft Assembly is the factory-correct replacement for the Deluxe Ultimate RCT (C1) rear shock used from 2023 onward. The kit includes the precision damper shaft, poker and rebound rod so you get everything needed to restore OEM performance and smooth rebound action. This assembly is manufactured to RockShox tolerances (SRAM Model ID: RS-SPP-A0, MPN 11.4118.112.450) and is available in multiple stroke ranges (37.5–45mm, 47.5–55mm, 57.5–65mm). The shaft is precision-ground and heat-treated for strength and wear resistance, then finished to deliver low friction and consistent damping response across temperature and mileage.

Key Features & Construction

Designed for durability and tuneability: the damper shaft assembly uses a heat-treated, precision-ground steel shaft that resists bending and surface wear. The included poker and rebound rod are made to the same OEM specs so seals, shims and valving interfaces remain correct for reliable damping performance. Real-world benefits include quicker rebuilds, restored rebound feel, reduced play and extended shock service life. Using genuine RockShox components preserves factory valving characteristics and prevents leaks or fitment issues that can arise with non‑OEM parts.

Fit, Sizing & Compatibility

This part is specified for the RockShox Deluxe Ultimate RCT (C1) rear shock, model years 2023 and newer. Verify your shock uses the C1 RCT damper and match the shaft stroke to your shock's specification: 37.5-45mm, 47.5-55mm, or 57.5-65mm. Check your shock service manual or the stamp on the factory damper to confirm exact fit. Manufacturer Part Number: 11.4118.112.450. Product Number: 943074. Shipping dimensions: 6" x 1" x 1"; weight: 0.25 lb. If you’re unsure about sizing or fit, consult a qualified suspension tech — incorrect shaft length or stroke range can affect travel, damping and seal life.

Who It's For

This damper shaft assembly is ideal for mountain bikers and suspension techs who want an OEM-level repair for a RockShox Deluxe Ultimate RCT (C1) shock. It’s aimed at riders who value precise rebound control, consistent damping and the long-term reliability that comes with genuine replacement parts. Whether you’re doing a home rebuild, a pro shop service, or replacing a damaged shaft after a hard hit, this kit gives you the exact components needed to restore factory performance and keep your bike tracking, pedaling and descending as intended.

Key Features

  • ✓ OEM replacement for RockShox Deluxe Ultimate RCT (C1) 2023+
  • ✓ Includes damper shaft, poker and rebound rod for full rebuild
  • ✓ Precision-ground, heat-treated steel shaft for strength and wear resistance
  • ✓ Available in three stroke ranges: 37.5–45mm, 47.5–55mm, 57.5–65mm
  • ✓ SRAM Model ID RS-SPP-A0 and MPN 11.4118.112.450 for exact fit
  • ✓ Restores factory rebound characteristics and reduces seal wear
  • ✓ Small, lightweight shipping footprint — easy to store for service

Specifications

Misc 37.5-45mm

Product Identifiers

Vendor Item # 11.4118.112.450
UPC 710845882029

Frequently Asked Questions

Will this damper shaft fit my Deluxe Ultimate RCT shock?

This assembly fits RockShox Deluxe Ultimate RCT (C1) shocks from 2023 onward. Confirm your shock uses the C1 damper and select the correct stroke range (37.5–45mm, 47.5–55mm, or 57.5–65mm) to match your original shaft.

What comes in the kit?

The kit includes the damper shaft, poker and rebound rod — the core internal components needed to restore damper function. It does not include external seals or bushings, so consider replacing those during a full service.

Can I install this myself or should I use a shop?

If you have experience with shock rebuilds and the right tools (torque wrench, snap ring pliers, suspension grease), you can install it at home. If unsure, we recommend a qualified suspension tech to ensure correct assembly, torque settings and leak-free seals.

Does this part restore factory damping feel?

Yes — this is a genuine RockShox component manufactured to OEM tolerances. Replacing the shaft and rebound rod with this assembly restores the intended valving interfaces and rebound characteristics when installed correctly.

How do I choose the correct stroke range?

Match the shaft stroke range to the stamped or documented dimension on your shock or to the original damper shaft. If you don’t have that info, check the service manual or contact Forest Bikes with your shock serial/model details for help.

Is this covered by warranty?

Warranty coverage is handled by RockShox/SRAM and depends on purchase date, usage and proof of proper installation. Keep your receipt and contact RockShox or Forest Bikes support for warranty inquiries.

Buying Guide

When buying damper shaft assemblies, match the part number and stroke range to your shock — OEM parts guarantee correct tolerances and valving fit. If you're doing a partial rebuild, consider purchasing a seal kit and fresh damper oil at the same time to complete the job and avoid repeated disassembly. For one-off repairs after impact or wear, prioritize genuine RockShox components like this DLX Ult C1 shaft to maintain factory performance. If in doubt, capture your shock serial number and dimensions, or have a suspension tech confirm the correct variant before purchase.

Ready to order?

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

View Full Product