The F43 fork for Surron Ultra Bee is here
Super responsive and purpose-tuned with 246 mm of ultra-plush travel. Its true moto architecture is built for the most aggressive riders, offering customization to suit your style.
F43 MX Tune | LSC | 246 mm Travel
MX Tune is a motocross specific tune with balance, control, and bottoming resistance for the fastest speeds.
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.)
120 lbs - 160 lbs (Light ships with 4.4/4.4 springs)
160 lbs - 200 lbs (Medium ships with 5.0/4.8 springs)
200 lbs - 240 lbs (Heavy ships with 5.4/5.0 springs)
240 lbs - 280 lbs (X Heavy ships with 5.4/5.4 springs)
280 lbs - 320 lbs (XX Heavy ships with 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, incl clamps and steerer
22 lbs / 10kg
Stanchions
Ø43, chrome-plated steel
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
MX TUNE
A motocross specific tune with balance, control, and bottoming resistance for the fastest speeds.
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.
MX TUNE
A motocross specific tune with balance, control, and bottoming resistance for the fastest speeds.
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.
TUNING DETAILS & RIDER WEIGHT RANGE
Every rider, every riding style. Sirris offers multiple weight ranges to choose from when selecting your suspension.
Listed weight ranges are body weight without riding gear.
SETTINGS NOTE: Settings are number of clicks from the closed position (full clockwise). Once they are in the closed position, back them out (counter-clockwise) according to the number of clicks indicated in the chart above to get you to factory settings.
*OIL NOTE: Sirris uses Shell Tellus S2 VX15 (5wt) in the fork cartridge and Shell Tellus S2 VX68 (20wt) as the bath oil. These are cross compatible with other high quality 5wt and 20wt suspension fluids. Sirris uses a semi-synthetic 2.5wt oil in the shock that is also compatible with other high quality 2.5wt aftermarket suspension fluids. You can use 5wt/20wt oils of your preference, Lubefinder.com can be used to source the fork oils. KYB K2C can be used in the shock and has wide availability.
TRUE SYMMETRICAL CLOSED CARTRIDGE
BALANCED PERFORMANCE
No matter how hard you ride or how many laps you take, our closed cartridge forks will never fade and will always feel predictable.
HYDRAULIC BUMP STOP
Go big with confidence, control, and comfort. Our hydraulic bump stop design and construction gives you a soft landing at max stroke even on the most aggressive impacts.
HIGH TENSILE LIGHTWEIGHT SPRINGS
Weighs only 8.8 lbs (4 kg) per leg (standard configuration spring).
NO COMPROMISES
DUAL OIL CIRCUITS FOR OPTIMUM PERFORMANCE
Separating lubrication and damping oils allows us to further optimize high and low speed damping performance.
HIGH QUALITY MATERIALS + SURFACE TREATMENTS
All cartridge bodies and outer tubes are hard anodized 7XXX series aluminum providing high durability and scratch resistance to keep your ride in top condition.
EVERY RIDER & RIDING STYLE
Fully tunable valving on compression and rebound, with spring rates matched to rider weight and riding type. Adapt your suspension setup for different types of rides, enhancing overall riding experience.
Compression, rebound, and preload adjust plus custom spring rates for all riding styles and rider sizes.
TECH HELP
Suspension setup, owner's guide, tech help, warranty and more. Learn how to properly set up, use, and maintain your new Sirris suspension products.
