Surron Ultra Bee

Sirris R46 SX Tune Shock

The stiffest shock ever made for the Ultra Bee. Period.
Developed with Josh Hill, the Sirris R46 SX Tune Shock is designed for one type of rider: pro-level senders who need the absolute firmest setup. If you’re not a sponsored or pro rider, this suspension will most likely feel way too stiff.

Built to handle the biggest hits, heaviest landings, and fastest lines, the SX Tune goes beyond motocross spec with stiffer damping, a firmer bottom-out bumper, and an ultra-heavy spring. It’s a shock designed to survive—and thrive—where most setups tap out.

⚡ The Sirris R46 SX Tune is suspension without compromise. Built for pros. Built for the biggest hits. Built to go full send—every lap, every time.

Don't forget the F43 SX Forks for a complete setup!

Why Choose SX Tune 🏁

• Extra-Stiff Setup – Designed for the hardest landings and biggest jumps

• Pro-Level Only – Recommended for sponsored or professional riders

• Superior Bottoming Control – SX-specific MCU bumper prevents harsh bottom-outs

• LSC Tuning – Low Speed Compression delivers predictable response lap after lap

• Built with Josh Hill – Proven at the highest levels of E-Moto performance

⚠️ Warning: Even if you’re “pretty fast,” the SX shock is likely too stiff unless you ride at pro intensity.

Rider Weight Options ⚡️

Two ranges available (weights listed without gear—add 15 lbs for riding gear):

• < 160 lbs → Light (115 N/mm spring)

• > 160 lbs → Medium (115 N/mm spring, tuned with different clicker settings)

TUNING DETAILS & RIDER WEIGHT RANGE