F43 suspension forks for Surron Ultra Bee
 
Its true moto architecture is built for the most aggressive riders, with tuning customization to suit your riding style.
 
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.
RIDER WEIGHT SPECS:
Sirris offers five weight ranges to choose from when selecting your MX Tune F43 fork. (Listed weight ranges are rider weight without riding gear on. 15 pounds of riding gear is calculated into the weight ranges)
120 lbs - 160 lbs (Light = 4.4/4.4 springs)
160 lbs - 200 lbs (Medium = 5.0/4.8 springs)
200 lbs - 240 lbs (Heavy = 5.4/5.0 springs)
240 lbs - 280 lbs (X Heavy = 5.4/5.4 springs)
280 lbs - 320 lbs (XX Heavy = 5.4/5.4 springs)
Fork spring rates listed above are left side/right side.
FORK SPECS:
Architecture
Upside down fork
Travel
246 mm
Free length
856 mm
Fork weight, includes clamps and steerer
22 lbs / 10kg
Stanchions
Ø43, high tensile steel with hard chrome
Outer tubes
Seamless 7050 aluminum, type 3 hard anodized coating
Drop outs
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
 
F43 MX Tune | LSC | 246 mm Travel
Light (120-160 lb) / MX / LSC –  Change