Fork Stage6 R/T Upside Down 650mm - 45/48mm

Stage6 R/T USD Racing Fork 650mm

The peak of high end – Stage6 R/T USD Fork for 50cc scooters, pit bikes and Mini GP.  This is a fork built for racing, intended for scooters like Yamaha Aerox / Yamaha Jog , Gilera Stalker / Gilera Runner, Piaggio Diesis as well as pitbike minicross (racetrack only, not offroad) + Mini GP.

Stage6 R/T brings advanced motorcycle suspension technology to 50cc scooters. Designed for riders demanding uncompromising handling and stability on the race track, this CNC-machined high-end racing fork offers full adjustability for compression, rebound, and spring preload.

The fork was developed and tested extensively across European tracks, with amazing results. It provides a ready-to-race setup suitable for a wide range of conditions to allow riders to compete at the highest level straight out of the box.

Stage6 offers a plug & play triple clamp for Yamaha Jog. It can also be customized with specific steering stems to fit almost every scooter model, however, you will have to build the stem yourself but it is definitely worth it for this high-end component.

Technical Features Stage6 R/T upside-down fork

Precision Spring Setup

Supplied with two springs: 30 lb (soft) and 34 lb (hard). Mix or match to achieve 32 lb (medium) depending on rider weight and track conditions.

Brake & Wheel Compatibility

Comes with spacer bushings for 250 mm brake discs (minimum 220 mm, in this case bushings have to be machined). Fits a wide variety of wheels; floating axle and orange bushings allow for fine-tuning alignment. Designed for use with the Stage6 R/T 4-piston brake caliper.

Floating Axle System

• Ensures precise fork leg alignment, eliminating friction and binding.
• Improves small-bump sensitivity, damping consistency, and front-wheel traction.
• Enhances steering precision and ride control under braking or on rough terrain.

Advantages of Upside-Down Design

• Increased Front-End Stiffness: Thicker upper fork near steering head reduces torsional flex to improve rigidity and front-end stability
• Improved Handling & Feedback: Less flex = precise front-end response, most noticeable during aggressive cornering or heavy braking.
• Reduced Unsprung Weight: Lighter stanchions for faster suspension response and better traction.
• Better Damping Consistency: Damping components sit higher up and are less impacted by heat and impacts.
• Stronger Under Heavy Braking: Thick upper part reduces dive wobble and improves stability.

Pressurized Fork Benefits

This fork features a pressurized system with expansion tanks, offering key advantages over standard upside-down forks:

• No Cavitation: Consistent damping without oil bubbles at high-speed movements.
• Better High-Speed Damping Control: Stable oil column for precise compression and rebound at rapid movements.
• Improved Small-Bump Sensitivity: Smooth oil flow with high reactivity to small irregularities for a plusher ride with enhanced grip.
• Less Heat-Induced Damping Fade: Maintains performance during long, aggressive race sessions.
• Longer Service Intervals: Reduced aeration and oil oxidation.

Specifications Stage6 Inverted Fork

• Fork Length: 650 mm
• Clamping diameters: 45mm (top) / 48mm (bottom)
• Brake Disc: 250 mm bushing supplied; min. 220 mm
• Brake Caliper Mount: M8, 82 mm spacing
• Springs: 30 lb soft (fitted), 34 lb hard (spare)
• Adjustments: Spring preload, rebound, compression
• Wheel Axle: 15 mm
• Nitrogen Pressure: 4 kg / 3.9 bar
• Oil: Spring side - 2.5W 90cc / Hydraulic side - 5W vacuum filled

Note: Installing this USD fork usually requires heavy modifications to fairings and frame. For plug-and-play convenience, see the standard Stage6 R/T racing fork.