Sirris R46 Rear Shock | Surron Ultra Bee

Introducing Sirris Suspension — a new era in e-moto performance suspension.

PRECISION PARTS
DURABLE AF
RACE READY

Purpose-built for the Sur-Ron Ultra Bee, the R46 rear shock is designed to completely transform rear-end performance with race-level tuning, durability, and adjustability.

TRANSFORM YOUR BIKE

The Sirris R46 delivers a fully tunable, pressure-balanced rear suspension system built for aggressive riding, high-speed stability, and maximum control.

Paired with Sirris front suspension systems, the R46 creates a fully harmonized chassis setup for next-level performance.

Key Features

Fully Tunable Performance System

• Adjustable compression and rebound damping
• Rider-weight matched spring rate options up to 300 lbs (135 kg)
• High responsiveness with precision valving control

LSC Tuned System (Low Speed Compression)

• Optimized pressure balance and ride frequency response
• Designed for consistent performance across varying terrain

Upgrade Path (DSC System)

• DSC (Dual Speed Compression) in development
• Future upgrade compatible with current LSC units via service
• Expanded tuning range when released

Build Quality & Durability

• Type 3 hard anodized body, reservoir, and hardware components
• Induction heat-treated hollow chrome shaft
• CNC 6061 aluminum piston with high-flow design
• ACME-threaded body and spring adjuster system
• MCU bottom-out bumper for impact absorption
• Fully serviceable and rebuildable design

  Specifications

  Specification	Details
  Piston	Ø46mm CNC 6061 Aluminum
  Stroke	85mm
  Length	320mm
  Weight	3.9 lbs (1.76 kg) without spring
  Shaft	Ø16mm chrome-plated, induction hardened hollow steel
  Body	6061 aluminum, Type 3 hard anodized
  Reservoir	Pressurized floating piston design
  Damping	Adjustable compression + rebound
  Seals	NBR high-durability seals

  Fitment

  • Sur-Ron Ultra Bee

   

  Compatibility Note

  For best fitment and clearance, Sirris strongly recommends using the Sirris rear triangle during installation. The R46 is engineered for maximum piston size while maintaining compatibility with OEM geometry, but tolerance variations may occur.

  Aftermarket linkage systems may cause interference. Always verify clearance before full installation.

   

  Performance Benefits

  The R46 significantly improves:

  • Rear wheel traction and control
  • High-speed stability
  • Bottom-out resistance
  • Cornering confidence
  • Suspension responsiveness under load

  Built for riders pushing their Ultra Bee into aggressive trail, track, and high-performance setups.

   

  Important Notes

  • Direct swap: 320mm length / 85mm stroke OEM Ultra Bee fitment
  • Fully rebuildable and serviceable design
  • Professional installation strongly recommended
  • Check clearance carefully during setup to prevent interference
  • Improper installation or incompatible linkage may result in damage or loss of control
  • Some configurations or spring rates may be made to order (pre-order items may ship with extended lead times)