COMING 10•22•26 - Sirris R38 SHOCK FOR SURRON LBX
R38 | 2SC | Surron LBX
Big moto performance. Bombproof durability.
The new Sirris R38 shock brings real big-bike suspension technology to compact e-motos, using proven internal architecture shared with the larger R46 platform and an oversized chassis built for serious abuse. While other shocks in this class fade, leak, and fail, this one is engineered to keep charging.
To accommodate the massive shock for smaller bikes, Sirris teamed up with Prickly to develop an R38 LBX specific linkage and triangle (sold separately).
Note: the stock LBX linkage and triangle WILL NOT WORK with the R38 shock.
Sirris offers two weight ranges to choose from when selecting your R38 shock for Surron LBX. (Listed weight ranges are rider weight without riding gear on. 15 pounds of riding gear is calculated into the weight ranges)
140 lbs - 180 lbs (Medium = 100 N/mm spring)
180 lbs - 220 lbs (Heavy = 110 N/mm spring)
PRODUCT SPECS:
Architecture
Piggyback, steel spring
Stroke
68 mm
Length
269 mm
Weight
3.3 lbs / 1.5 kg without spring
Adjusters
2SC = Two Stage Compression (Independent high-speed and low-speed adjust)
• Tool-free low-speed compression adjust, 18 clicks
• High-speed compression adjust, 24 clicks (20mm hex)
• Tool-free rebound adjust, 24 clicks
• Spring preload adjust
R38 shares the same high-flow base valve cavity architecture as the larger R46. Massive oil flow delivers true moto-level damping feel, control, and consistency. Pro-level CMX (Compact Motocross 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 each bike model and designed to pair perfectly with Sirris F43 CMX 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-spec internal floating piston system manages shaft displacement with precision, maintaining consistent damping feel under repeated hard hits and high heat loads.
Shaft
Same shaft as R46. 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
A new smaller diameter body, spring, retainers, and hardware package reduce overall size while preserving the oversized internal flow characteristics that define the shock’s ride quality.
Seamless 6061 aluminum, type 3 hard anodized coating, ACME thread
Piston
The 38mm high-flow main piston uses true powersports architecture. Slightly smaller than the R46 piston but built with the same philosophy, it delivers massive tuning range and consistent damping performance far beyond anything in this category.
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
Body Cap
New upper body cap engineered for tighter chassis fitment without sacrificing internal oil flow performance.
Ultra-durable chrome plated, teflon-lined spherical bearings.
Lower Eyelet
New lower eyelet maintains maximum rebound oil flow to the shaft and metering rod while fitting smaller bike platforms.
Ultra-durable chrome plated, teflon-lined spherical bearings.
Bottom out
MCU bumper
Top out
Rubber bumper
Seals
HNBR
The new Sirris R38 shock brings real big-bike suspension technology to compact e-motos, using proven internal architecture shared with the larger R46 platform and an oversized chassis built for serious abuse.
A completely new 2SC compression adjust system and massive oil flow deliver true moto-level damping feel, control, and consistency — worlds apart from the mountain bike-based shocks found on most compact e-motos. Tuned specifically for each bike model and designed to pair perfectly with Sirris F43 CMX forks, it delivers unmatched balance, traction, and confidence at speed.
More durability, control, and performance. Nothing else is built like it.
R38 EXPLAINED
HOW WE DID IT
We didn’t start with a mountain bike shock and try to make it survive e-moto abuse.
We started with our proven R46 moto platform and engineered it into a more compact package without sacrificing the strength, oil flow, or performance that make a true moto shock work.
The result is a compact shock with real moto DNA throughout.
2SC
Hard-Hit Capability Meets Unmatched Ride Feel
Built to handle the biggest impacts with greater control and stability while preserving the smooth, connected ride feel Sirris is known for.
LOW-SPEED COMPRESSION
The low-speed adjuster balances suspension plushness with control of slower vertical suspension movements. These movements are created by rider inputs and terrain features such as braking, cornering, and gradual compressions.
HIGH-SPEED COMPRESSION
The high-speed adjuster balances suspension plushness with control of fast vertical suspension movements caused by high-impact events such as jump landings, whoops, square-edge bumps, and other sharp impacts.
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.
FAQ'S
Do I really need the Prickly triangle and linkage for this shock to work on my Surron LBX?
Yes. The stock linkage and triangle will not work because the shock is bigger. The Prickly linkage and triangle was designed specifically for this new shock for Surron LBX.
Does this R38 shock have more travel than the stock shock?
The wheel travel and ride height of the motorcycle are the same as stock. However, due to the robust moto style parts, the travel of the shock is less than stock. The Prickly triangle and link changes the motion ratio to compensate for the shorter shock travel.
Does this shock and linkage fit on the LBX ok, and do I need to do any frame modifications?
No frame modifications are needed, this is a bolt-on direct fit solution. You must use the Prickly linkage and triangle with the R38, the stock LBX linkage and triangle will not work with the R38.
Does this new shock and linkage affect bike geometry and stance?
No, the stock geometry is maintained with the Sirris CMX 220 fork and R38 shock.
Can I buy the Prickly linkage and triangle directly from Prickly or dealers?
Yes. Feel free to contact Prickly or any dealers that carry Prickly. The parts fit inside the shock box if purchased from us, no additional shipping charges are required if purchased at the same time.
Does the Prickly linkage and triangle ship with the R38 shock?
You must add the Prickly linkage kit (includes the triangle) to cart with your R38 shock order, they must be purchased at the same time to ship together. But yes, the linkage and triangle fits inside the shock box and will ship as a single unit.
