Sirris R46 Trail Tune Rear Shock | By Sirris Suspension | For Sur-Ron Ultra Bee

Trail Tuned Suspension Built for Real E-Moto Speed

At REV Rides we see a lot of riders pushing the Sur-Ron Ultra Bee well beyond what the stock suspension was designed for. The Sirris R46 Trail Tune Shock was built specifically to unlock the true potential of this platform. It delivers a pressure-balanced piggyback design, a massive 46mm piston, and fully tunable compression and rebound so riders can push harder across real terrain.

The Trail Tune is Sirris’ most versatile setup. It is sporty and supportive while still absorbing rough terrain with confidence. Whether you are riding fast technical trails, open desert terrain, or aggressive singletrack, this shock keeps the rear of the bike planted and predictable.

Paired with a Sirris front fork, this shock completes a balanced suspension system that dramatically improves traction, stability, and rider confidence. The R46 Trail Tune is built specifically for e-moto platforms where torque delivery and weight distribution demand suspension that can react quickly and stay consistent ride after ride.

Why the R46 Trail Tune Shock Stands Out

• Large Ø46mm high-flow piston improves damping control and consistency

• Piggyback reservoir design maintains pressure balance and prevents fade

• Fully tunable compression and rebound allows precise suspension setup

• Trail Tune valving designed for fast riding across varied terrain

• Spring rates matched to rider weight for optimized performance

• Type III hard anodized components for long-term durability

• Induction hardened hollow shaft improves strength while reducing weight

• Fully serviceable design allows easy rebuilds and custom tuning

Trail Tune Performance

The Trail Tune is designed to be aggressive yet versatile. It provides a sporty and supportive ride feel that allows riders to maintain speed over rough terrain without sacrificing comfort or control.

• Supportive damping for aggressive trail riding

• Excellent traction across mixed terrain

• Balanced ride feel for long distance riding

• Designed specifically for lightweight e-moto platforms

Technical Specifications

• Architecture: Piggyback reservoir, steel spring

• Shock Length: 320 mm

• Stroke: 85 mm

• Weight: 3.9 lb / 1.76 kg (without spring)

• Piston: Ø46 mm CNC 6061 billet aluminum, Type III hard anodized

• Piston Band: Hard band

• Shaft: Ø16 mm chrome plated induction hardened hollow shaft

• Shock Body: Seamless 6061 aluminum, Type III hard anodized with ACME thread

• Spring Retainer: 6061 aluminum, Type III hard anodized with locking feature

• Reservoir: Pressurized with floating piston

• Damping: Tunable compression and rebound

• Bottom Out: MCU bumper

• Top Out: Rubber bumper

• Seals: NBR

Rider Weight Options

• Light: 130–160 lb rider weight, 75 N/mm spring

• Medium: 160–210 lb rider weight, 85 N/mm spring

• Heavy: 210–230 lb rider weight, 90 N/mm spring

• X Heavy: 230–250 lb rider weight, 95 N/mm spring

• XX Heavy: 250–280 lb rider weight, 105 N/mm spring

• XXX Heavy: 280–350 lb rider weight, 115 N/mm spring

Rider weight ranges are based on body weight without riding gear. Sirris factors approximately 15 lb of riding gear into the recommended weight ranges. Upgrades such as larger batteries, controllers, or other heavy components should also be added to rider weight when selecting spring rates.

Trail Tune Setup Notes

• Settings are measured in clicks from the fully closed position

• Turn adjusters fully clockwise, then back out to recommended settings

• Riders near weight cutoffs may adjust preload to dial in sag

• Aggressive riders may benefit from moving up one weight class

• Rider preference and terrain may require additional tuning

Example: A 190 lb rider without gear and 20 lb of upgrades would calculate total rider weight at 210 lb. An aggressive rider may choose the Heavy spring with lower preload, while a relaxed rider may run the Medium spring with higher preload.

Fitment

• Sur-Ron Ultra Bee

Ideal Riders for This Shock

• Ultra Bee riders who want better traction and rear-end control

• Trail riders pushing faster speeds across rough terrain

• Riders building a fully upgraded suspension setup with matching Sirris forks

Fitment: Sirris R46 E-moto shock w/ Trail tune | for Surron Ultra Bee

• Surron Ultra Bee

This product may be compatible with more models than shown above. Please see the product description for full details, or contact us for help with fitment.