RockShox Boxxer C1 CSU Upper Tube

$220.00

In Stock

OEM replacement upper (CSU) tube for RockShox Boxxer C1 (2019+). Precision-machined, hard-finish stanchion available left or right to restore fork performance.

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Available Options

Option	Price	Availability
RockShox, CSU/Upper Tube for Boxxer C1, Right, Black, Boxxer C1(2019+)	$220.00	In Stock
RockShox, CSU/Upper Tube for Boxxer C1, Left, Black, Boxxer C1(2019+)	$220.00	In Stock

Product Details

Overview & Technology

RockShox Boxxer C1 CSU Upper Tube (Part No. 942573, Mfg. PN 11.4018.093.000) is the direct replacement upper/stanchion for the Boxxer C1 fork introduced in 2019 and later. Identified by SRAM Model ID FS-SPP-A0, this upper tube is offered as individual left or right pieces so you can swap only the damaged side and get back on track fast. These uppers are precision-machined to OEM tolerances and finished for smooth seal interaction and long-term wear resistance. Replacing a bent or scored stanchion with a genuine RockShox unit restores damping consistency, reduces oil leakage risk, and preserves fork travel accuracy — critical for high-speed downhill and gravity riding.

Key Features & Construction

This CSU upper tube is built to meet RockShox factory specifications. The tube is machined from high-grade alloy and finished with a hard surface treatment to resist scratches and extend seal life. The build supports the Boxxer C1’s wide-bore design and heavy-duty internals engineered for downhill impact and repeated compressions. Real-world benefits: • OEM fit and finish keeps fork geometry and damping consistent. • Hard finish reduces seal wear and oil contamination. • Individual left/right availability minimizes repair cost and turnaround time.

Fit, Compatibility & Installation

Compatible with RockShox Boxxer C1 forks from 2019 onward. Verify SRAM Model ID FS-SPP-A0 against your fork’s service parts list before ordering. This part replaces the CSU/upper tube on the specified Boxxer C1 models — each listing indicates whether it’s the left or right side. Installation requires basic fork service skills: drain and clean the lowers, remove axle/arch hardware, press out the damaged upper, and press in the new stanchion with correct lubrication and torque on seals and retaining hardware. We recommend factory service instructions or a qualified suspension shop if you’re not experienced; incorrect assembly can damage seals or impair damping.

Who This Part Is For

This is for downhill and gravity riders running a Boxxer C1 who have damaged, bent, or excessively worn stanchions. If you’re seeing oil weeping, scoring on the tube, or inconsistent fork action after impact, replacing the affected upper tube is often the most cost-effective fix compared to full fork replacement. Also ideal for suspension technicians and shops stocking OEM spares for race teams and rental fleets — the single-side option reduces inventory cost while ensuring a genuine RockShox replacement part is always available.

Key Features

✓ Direct OEM replacement for RockShox Boxxer C1 (2019+)
✓ Available as individual left or right upper/stanchion
✓ SRAM Model ID FS-SPP-A0 — exact factory fit
✓ Precision-machined alloy construction for durability
✓ Hard surface finish to reduce seal wear and scuffs
✓ Restores damping consistency and travel accuracy
✓ Shipping dims 13" x 2" x 6", weight approx 1 lb

Product Identifiers

Vendor Item #	11.4018.093.000
UPC	710845821172

Frequently Asked Questions

Is this upper tube compatible with my Boxxer fork?

This upper/stanchion fits RockShox Boxxer C1 forks from 2019 onward. Check your fork’s service parts list or look for SRAM Model ID FS-SPP-A0 to confirm compatibility before ordering.

Can I replace only one side of the fork?

Yes. This part is sold as individual left or right upper tubes so you can replace only the damaged side. Replacing a single stanchion is common and helps keep repair costs down.

Do I need special tools to install it?

Basic fork service tools and mechanical competence are required (torque wrench, press or suitable driver for stanchion installation, seals lube). If you’re unsure, have a qualified suspension tech or shop handle installation to avoid seal damage or improper assembly.

Will replacing one stanchion affect fork performance?

A correct OEM stanchion will restore geometry and damping when installed and serviced properly. If one side is significantly older or more worn than the other, consider assessing both halves; in many cases a single replacement matches performance if the other side is in good condition.

What should I check after installation?

After installing the upper tube, check for smooth travel through full travel, absence of oil leaks, correct torque on axle and arch hardware, and that seals are seated properly. A short test ride at low speed is recommended before full-downhill use.

Is this an OEM RockShox part and does it carry a warranty?

This is a genuine RockShox OEM upper tube (Mfg. PN 11.4018.093.000). Warranty coverage follows RockShox terms and is subject to proof of purchase and normal warranty conditions — contact Forest Bikes support or RockShox for warranty specifics.

Buying Guide

When buying a replacement upper/stanchion for a Boxxer C1, confirm the fork model year and SRAM Model ID to ensure an exact match. Choose individual left or right pieces if only one tube is damaged to save cost and reduce downtime. Also factor in service items: seals, oil, and any worn bushings should be replaced at the same time to guarantee longevity and restore factory performance. If you’re not comfortable with suspension work, a reputable suspension shop will handle the swap and pressure-test the fork for safe downhill use.

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