SIRRIS R46 SX TUNE SHOCK FOR SURRON ULTRA BEE
Proven at the highest level. Built from real-world feedback.
R46 SX Tune | 2SC | Surron Ultra Bee 1.2
MORE ADJUSTABILITY. MORE CONTROL.
Now with 2SC (Two Stage Compression), revised clicker settings, and new graphics.
SX Tune is built for the biggest hits, hardest landings, and highest speeds. SX Tune is our stiffest, most aggressive suspension setup, engineered for pro-level riders who demand maximum support when pushing the limits. PRO-LEVEL RIDERS ONLY.
RIDER WEIGHT SPECS:
Sirris offers two weight ranges to choose from when selecting your SX Tune shock. (Listed weight ranges are rider weight without riding gear on. 15 pounds of riding gear is calculated into the weight ranges)
PRODUCT SPECS:
Architecture
Piggyback, steel spring
Stroke
85 mm
Length
320 mm
Weight
3.9 lbs / 1.76 kg without spring
Adjusters
2SC = Two Stage Compression (Independent high-speed and low-speed adjust)
• Low-speed compression adjust, 18 clicks
• High-speed compression adjust, 24 clicks (20mm hex)
• Rebound adjust, 24 clicks
• Spring preload adjust
Damping
High-flow base valve cavity architecture. Massive oil flow delivers true moto-level damping feel, control, and consistency. SX Tune damping with fully tunable compression and rebound circuits with high-flow internals that stay cool and consistent.
The result is exceptional pressure balance, faster frequency response, and a level of responsiveness normally reserved for full-size motocross suspension.
Tuned specifically for Surron Ultra Bee and designed to pair perfectly with Sirris F43 forks, it delivers unmatched balance, traction, and confidence at speed.
Reservoir
Specifically designed around the large 16mm shaft and high oil displacement demands. The massive R46 internal floating piston system manages shaft displacement with precision, maintaining consistent damping feel under repeated hard hits and high heat loads.
Shaft
Massive 16mm induction heat-treated hollow shaft with hard chrome finish — delivers extreme structural strength and huge oil flow through the main piston for true moto-level damping performance.
Ø16 mm OD chrome-plated, induction hardened steel, hollow, Ø 5.5 mm ID
Shock body
Seamless 6061 aluminum, type 3 hard anodized coating, ACME thread
Piston
High-flow main piston uses true powersports architecture, it delivers massive tuning range and consistent damping performance.
Ø46 mm, CNC 6061 billet aluminum, type 3 hard anodized coating
Piston band
Hard band
Spring retainer
Seamless 6061 aluminum, type 3 hard anodized coating, ACME thread, with locking feature, manual adjust
Bottom out
MCU bumper
Top out
Rubber bumper
Seals
NBR
The R46 receives an equally focused evolution, led by the introduction of Sirris 2SC—Two-Stage Compression—across the Trail, MX, and SX platforms. Two independent compression adjustments give riders significantly more control over how the shock responds to different types of terrain and impacts.
Low-speed compression allows riders to fine-tune chassis support and control during slower suspension movement, while high-speed compression manages the rapid shaft movement generated by jump landings, whoops, square-edge hits, and sharp impacts.
The result is greater adjustability and more ability to tune the Ultra Bee exactly to the rider, terrain, and riding style—while maintaining the controlled, connected ride feel Sirris is known for.
Isolation Explained
2SC independent adjuster architecture is engineered to maximize sealing integrity, prevent oil bypass, and eliminate piston back-off under high loads.
By isolating adjuster movement from the piston assembly and maintaining high o-ring preload without excessive adjuster torque, the system delivers long-term durability, damping consistency, and robust performance beyond conventional high-speed compression designs.
- Non-translating high-speed and low-speed adjusters prevent piston assembly rotation for enhanced long-term durability and reliability.
- Avoids the harshness and ineffective tuning commonly associated with traditional high-speed adjusters.
- Carefully engineered high-speed circuit minimizes the typical side effects found in conventional designs.
TUNING DETAILS & RIDER WEIGHT RANGE
Listed weight ranges are body weight without riding gear (15 pounds of riding gear is calculated into the weight ranges).
Weights of upgrades (battery, controller, etc) need to be added to rider weight.
SX TUNE Starting point notes:
This is the starting point based on feedback from test riders and calculations. Assuming neutral riding position, and 15lbs gear
- We recommend SX tune for pro-level riders only
- Assuming aggressive riding position, and 15lbs gear
- Stock bike with 18/21
- Weights of upgrades (battery, controller etc) to be added to rider weight
- Rider preference and riding conditions may require a different setup
Example:
- 150 lb rider without riding gear, 15lbs gear, 10lbs upgrades
- Weight calculation 150+2x10=170lbs.
- Medium Tune recommended
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.
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.
