2021 KTM 790 / 890 Duke / R Suspension Hydraulics, Fork Fluids & Sag Tuner

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

Front Preload Baseline

Non-adjustable progressive spring

Rebound Damping Baseline

Split-circuit right leg rebound valving

Compression Damping Baseline

Split-circuit left leg compression valving

Target Free Sag (Unladen)

20 - 26 mm

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.

Motul Factory Line Fork Oil 5W (1 Liter)

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

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.

105 mm (4.13 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.

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 790 / 890 Duke / R platform. Always check your individual 17-digit VIN at an authorized dealership or via NHTSA.gov for individual recall completions.