Dedicated Subsystem WorkbenchPlatform Gen: 2021–2026

2021 Honda Rebel 1100 (CMX1100) Suspension Hydraulics, Fork Fluids & Sag Tuner

Front fork travel, rear shock travel, spring preload, damping click baselines, and dynamic rider sag calculator for 2021 Honda Rebel 1100 (CMX1100).

Gen 2021–2026

Factory Platform Compatibility: All workshop fluid capacities, maintenance milestones, torque specifications, and consumables on this specification sheet are factory-identical across model years 2021 through 2026.

Select Model Year:(Active: 2021)

2021 2022 2023 2024 2025 2026

Engine

1084cc

Drive

525

Cooling

Liquid-Cooled

Suspension Hydraulics, Fork Fluids & Interactive Sag Tuner

Showa • KYB • WP Standards

OEM hydraulic capacities, air-gap measurement standards, clicker baselines, and mathematical rider sag tuning.

Shop 43mm Fork Seals

Fork Architecture

Conventional Telescopic (43mm Cartridge Style)

Oil Volume Per Leg

540 ml (18.3 US fl oz) per leg

OEM Fluid Specification

Honda Ultra Cushion Oil 10W (SAE 10W)

Air-Gap Spec (Oil Level)

140 mm (5.51 in) compressed, spring removed

Fork Seal Dimensions

43 x 54 x 11 mm

Total Suspension Travel

Front: 121 mm • Rear: 95 mm

Target Rider Sag: 32 - 38 mm (26 - 31% of 121 mm travel)

Front Preload Baseline

Threaded preload caps (2 lines visible)

Rebound Damping Baseline

Factory fixed hydraulic valve

Compression Damping Baseline

Factory fixed hydraulic valve

Target Free Sag (Unladen)

20 - 25 mm

Enter 3-Point Sag Measurements (mm)

L1: Extended

L2: Static Bike

L3: In Full Gear

Suspension Sag Diagnosis & Geometry Status

Enter your extended, static, and rider measurements on the left (or select a preset) to compute exact sag percentages and spring preload recommendations.

Factory Fluid StandardDirect Spec

Maxima Racing Fork Fluid 10W (1 Liter)

Formulated with anti-foam agents and shear-stable viscosity index improvers to prevent damping fade under aggressive riding heat.

Fork & Dust Seal KitExact Stanchion Fit

All Balls Racing 43mm Fork & Dust Seal Kit

Features directional triple-lip rubber seal profile and external garter springs engineered to withstand heavy stanchion flex without weeping.

Air-Gap Tuning PhysicsBottoming Control

140 mm (5.51 in) compressed, spring removed

Trapped air column acts as a progressive spring in final 30% of stroke. Adding +5mm oil increases bottoming resistance without stiffening small bump compliance.

Recommended Maintenance Parts: Maxima Racing Fork Fluid 10W (1 Liter) • All Balls Racing 43mm Fork & Dust Seal Kit

Shop Fork Fluids Find Direct-Fit Fork Seals

Official NHTSA Safety Recalls & Technical Bulletins

1 Active Campaign

U.S. Department of Transportation compliance database (Title 49 U.S.C. Chapter 301).

Verify VIN on NHTSA.gov

The U.S. National Highway Traffic Safety Administration reports 1 safety recall campaign associated with this platform. Independent repair shops and riders should confirm that authorized dealership warranty remedies have been applied.

NHTSA #21V987000ENGINE AND ENGINE COOLING:COOLING SYSTEM:RADIATOR ASSEMBLY

Received: 16/12/2021▼

Defect Description

Honda (American Honda Motor Co.) is recalling certain 2021 Honda Rebel 1100 (CMX1100) motorcycles. The radiator cap may have been improperly formed during manufacturing, which could create an insufficient seal.

Safety Hazard / Consequence

An insufficiently sealed radiator cap may leak or spray hot coolant, increasing the risk of injury or crash.

Factory Remedy & Repair Action

Dealers will replace the radiator cap and refill any lost coolant, free of charge. Owner notification letters were mailed February 22, 2022. Owners may contact Honda service at 1-888-234-2138. Honda's number for this recall is KN1.

Manufacturer Notes: Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.