2021 KTM 450 SX-F Suspension Hydraulics, Fork Fluids & Sag Tuner

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

Front Preload Baseline

10.7 bar (155 PSI) WP XACT Air Spring (Adjust via digital WP air pump)

Rebound Damping Baseline

Fork (Right Leg Bottom): 15 clicks out | Shock: 15 clicks out

Compression Damping Baseline

Fork (Right Leg Top): 15 clicks out | Shock Low-Speed: 15 clicks out / High-Speed: 1.5 turns out

Target Free Sag (Unladen)

25 - 35 mm (at 10.7 bar / 155 PSI air spring baseline)

Enter 3-Point Sag Measurements (mm)

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.

Motorex Racing Fork Oil 4W (1 Liter)

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

SKF 48mm WP Dual-Compound Fork & Dust Seal Kit

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

WP XACT Air Pressure (Left Leg): 10.7 bar (155 PSI) cold with front wheel off ground

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

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

No Active Federal Safety Recalls Reported

The U.S. DOT National Highway Traffic Safety Administration (NHTSA) records zero open safety recall campaigns for the 2021 KTM 450 SX-F platform. Always check your individual 17-digit VIN at an authorized dealership or via NHTSA.gov for individual recall completions.