Sirris R46 MX Tune Shock | Surron Ultra Bee
Pair with
Sirris R46 MX Tune Shock | Surron Ultra Bee
Description
Surron Ultra Bee
Sirris R46 MX Tune Shock
The R46 for Surron Ultra Bee is here—built to unlock your bike’s full potential.
Pressure balanced, fully adjustable, and optimized for E-Moto, the Sirris R46 MX Tune Shock is the perfect rear match to the F43 fork. Together, they create the ultimate suspension package for riders who demand motocross performance.
The MX Tune is firm, aggressive, and built to handle motocross abuse—huge jumps, endless whoops, and race-speed cornering. You’ll give up a little trail plushness, but gain maximum control and bottoming resistance when it matters most.
Pair with the F43 MX Fork for the ultimate setup!
Advanced Tuning Options 🛠
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LSC (Low Speed Compression): Superior pressure balance and frequency response for unmatched predictability.
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Optional 2SC (coming soon): Wider adjustment range, fits the same cavity, cross-compatible with a rebuild.
Built to Last ⚡
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Durable Finishing: Type 3 hard anodized body, reservoir, and hardware. Induction heat-treated, hard chrome hollow shaft for strength.
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Serviceability: Fully rebuildable design makes tuning, maintenance, and long-term ownership simple.
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Longevity: Built to stay looking new—even after thousands of miles.
Why Choose the MX Tune 🏁
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Motocross-Specific Setup – Tuned for speed, stability, and control
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Bottoming Resistance – Confidence on g-outs and big landings
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Fully Adjustable – Compression & rebound to dial in your ride
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Exceptional Responsiveness – LSC pressure balance ensures predictability lap after lap
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Built for E-Moto – Engineered to take on the demands of the Ultra Bee
Rider Weight Options ⚡️
Choose your setup (weights listed without gear—add 15 lbs for riding gear):
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120–160 lbs → Light (ships with 85 N/mm spring)
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160–200 lbs → Medium (95 N/mm spring)
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200–240 lbs → Heavy (105 N/mm spring)
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240–280 lbs → X Heavy (115 N/mm spring)
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280–320 lbs → XX Heavy (115 N/mm spring)
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.
MX Tune Starting point notes:
- Assuming neutral riding position, and 15 lbs gear
- Weights of upgrades (battery, controller, etc) to be added to rider weight
- Stock bike with 18/21 wheels
- Riders close to a weight cut off need to adjust preload to compensate
- Very aggressive/pro riders to consider +1 weight class and drop preload to get sag. Especially if in the upper range.
- Rider preference and riding conditions may require a different setup
- XX Hvy same spring rates as X Hvy due to maxed out rear spring rate
Example:
- 180 lb rider without riding gear, 20 additional lbs with upgraded controller/battery
- Weight calculation 180+20=200
- Aggressive rider = Heavy tune with low preload
- Relaxed rider = Medium tune with high preload
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 Specs
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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