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

Surron Ultra Bee F43 MX Tune | LSC | 246 mm Travel