MX Tune is a motocross-specific tune with balance, control, and bottoming resistance for the fastest speeds. It’s firm suspension for maximum control and support for huge jumps, whoops and fast cornering. If you select the EBMX or MX spec, you’ll compromise a bit of trail plushness for improved bottoming resistance.

• Architecture: Upside-down fork
• Travel: 246 mm
• Free length: 856 mm
• Fork weight: 22 lbs / 10kg
• Stanchions: Ø43, high tensile steel with hard chrome
• Outer tubes: Seamless 7050 aluminum, type 3 hard anodized coating
• Dropouts: Forged 6061 aluminum, type 3 hard anodized coating
• Triple clamps: Forged 6061 aluminum, type 3 hard anodized coating
• Steer tube: Seamless 7050 aluminum, type 2 anodized coating
• Damping: Symmetrical, adjustable closed cartridge with spring-backed IFP
• Damper bodies: Seamless 7050 aluminum, type 3 hard anodized coating
• Rebound: Dual side high tensile steel spring, adjustable
• Adjusters: External compression and rebound adjustment
• Seals: NBR:
• Guards: High-impact PP, 210-degree wraparound

SHOCK SPECS:

• Architecture: Piggyback, steel spring
• Stroke: 85 mm
• Length: 320 mm
• Weight: 3.9 lbs / 1.76 kg without spring
• Piston: High flow Ø46 mm, CNC 6061 billet aluminum, type 3 hard anodized coating
• Piston band: Hard band
• Shaft: Ø16 mm OD chrome-plated, induction hardened steel, hollow, Ø 5.5 mm ID
• Shock body: Seamless 6061 aluminum, type 3 hard anodized coating, ACME thread
• Spring retainer: Seamless 6061 aluminum, type 3 hard anodized coating, ACME thread, with locking feature, manual adjust
• Bottom out: MCU bumper
• Top out: Rubber bumper
• Damping: Tunable compression and rebound
• Reservoir: Pressurized with a floating piston
• Adjusters: External compression and rebound adjustment
• Seals: NBR

Top Benefits of Sirris F43 MX Tune Ultra Bee Fork

1. Exceptional Bottoming Resistance: The MX Tune is designed specifically for higher impacts — big jumps, whoops, and hard cornering
2. Rider Weight & Style: You can choose among multiple spring rates (Light, Medium, Heavy, X-Heavy, XX Heavy), and adjust preload, compression, and rebound.
3. High-Quality Build and Materials: lt with premium materials: 43mm hard-chrome stanchions, seamless 7050-series aluminum outer tubes with hard anodized finish, forged dropouts and triple clamps.
4. Hydraulic Bump Stop & Dual Oil Circuits for Smoother: The hydraulic bump stop helps soften big impacts at full travel, reducing harsh landings.
5. Plug-and-Play Fit: The F43 MX Tune fork is designed to integrate directly into the Ultra Bee without needing modifications—OEM display, fender, brake mounts, and cable routing are compatible.