Sirris R38 SHOCK FOR E-RIDE PRO 3.0
R38 | 2SC | E-Ride Pro 3.0
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 specific linkage (sold separately). Engineered for precise fitment and optimized geometry, this custom linkage raises the rear of the bike by 25mm to accommodate the 289×78 Sirris R38 shock.
Note: the stock E-Ride Pro linkage WILL NOT WORK with the new R38 shock.
CMX fork drop clamp can be added to raise the front by an equivalent 25mm.
Sirris offers two weight ranges to choose from when selecting your R38 shock for E-Ride Pro 3.0. (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 = 80 N/mm spring)
180 lbs - 220 lbs (Heavy = 90 N/mm spring)
PRODUCT SPECS:
Architecture
Piggyback, steel spring
Stroke
78 mm
Length
289 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
REQUIRED LINKAGE KIT
The Prickly Sirris R38 Linkage is a purpose-built upgrade designed specifically to fit the Sirris R38 rear shock on E-Ride Pro SR and 3.0 models.
(The stock E-Ride Pro lower linkage is not compatible with the R38 shock.)
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.
The Sirris 2SC takes everything riders love about the Sirris LSC platform—its exceptional responsiveness, traction, pressure balance, and terrain-following feel—and adds a truly effective independent high-speed compression system engineered for real performance gains.
The 2SC delivers meaningful support when the terrain demands it. Riders feel increased confidence charging into hard hits and rough sections, with greater straight-line stability and control, while preserving the supple traction and comfort that define the Sirris ride quality.
Built around the same high-flow piston architecture as the LSC, the 2SC maintains the fast frequency response and sensitivity Sirris is known for, while its carefully engineered high-speed circuit avoids the common compromises and side effects found in traditional designs. The result is a wide tuning range that adds performance without taking anything away.
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 linkage for this shock to work on my E-Ride Pro?
Yes. The stock linkage will not work because the shock is longer. The Prickly linkage was designed specifically for this new shock for E-Ride Pro SR and 3.0.
Do I need a drop clamp fork if I run the R38 with Prickly linkgage on my E-Ride Pro?
Type of riding, bike modifications, and rider preference will affect the choice to use a drop clamp or not.
All bikes with a 21” front wheel require a drop clamp for tire clearance.
Sirris has tested and tuned with a drop clamp on bikes with 19/18 wheels.
Sirris has not tested and tuned with 19/16 wheels. Our partner athletes racing with 19/16 wheels have been using drop clamps. Running a drop clamp with a 16 inch rear wheel will make the bike more stable at speed but may affect cornering.
Does this R38 shock have more travel than the stock shock or EXT Arma shock that fits E-Ride Pro SR and 3.0?
The rear wheel will have the same amount of travel as stock.The R38 has less travel but our engineers worked with Prickly to change the motion ratio of the rear suspension to keep the same wheel travel.
What is the difference between the R38 shocks for E-Ride Pro SR and 3.0 model?
Both models feature the same design and functionality, with the only differences being the spring rates and clicker settings. The 3.0 model is offered with 80 N/mm (Medium) and 90 N/mm (Heavy) springs, while the SR model is equipped with 90 N/mm (Medium) and 100 N/mm (Heavy) springs.
I bought a CMX fork awhile back, what do I need to know if I buy this new shock and linkage?
The only difference is clicker settings for compression and rebound on the fork.
The original CMX forks were tuned to work with EXT Arma shock, for E-Ride Pro SR and 3.0. You can see all of the clicker settings (new and old) in the OWNER’S GUIDES PDF download. This is under our SERVICE & TECH main navigation link, and also directly available on the SR and 3.0 product pages.
Type of riding, bike modifications, and rider preference will affect the choice to use a drop clamp or not.
All bikes with a 21” front wheel require a drop clamp for tire clearance.
Sirris has tested and tuned with a drop clamp on bikes with 19/18 wheels.
Sirris has not tested and tuned with 19/16 wheels. Our partner athletes racing with 19/16 wheels have been using drop clamps. Running a drop clamp with a 16 inch rear wheel will make the bike more stable at speed but may affect cornering.
I want to buy this new shock and linkage, and a new CMX fork - what do I need to know when I buy a new CMX fork for E-Ride Pro SR or 3.0?
The CMX forks are now updated with slightly different clicker settings to pair with the new R38 shock. Your fork and shock tune (Medium or Heavy) should match. The biggest question is whether to run the flat clamp or drop clamp version. The answer to that varies based on several factors including wheel size.
The R38 with the Prickly link raises the rear of the bike by 25mm. This increases ground clearance under the bike and tire clearance under the seat, two known issues with the stock bike. Raising the rear of the bike without changing anything in the front will affect the geometry and stance.
Type of riding, bike modifications, and rider preference will affect the choice to use a drop clamp or not.
All bikes with a 21” front wheel require a drop clamp for tire clearance.
Sirris has tested and tuned with a drop clamp on bikes with 19/18 wheels.
Sirris has not tested and tuned with 19/16 wheels. Our partner athletes racing with 19/16 wheels have been using drop clamps. Running a drop clamp with a 16 inch rear wheel will make the bike more stable at speed but may affect cornering.
If you decide to run a flat clamp now and want to use a drop clamp in the future, the install process is easy. Here is the link to the drop clamps on our service parts page: https://ridesirris.com/products/service-drop-clamp-cmx-430-91-023-xxx-xx
Does this shock and linkage fit on the E-Ride Pro 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 with the R38, the stock E-Ride Pro linkage will not work with the R38.
Does this new shock and linkage affect bike geometry and stance?
Yes. It raises the rear 25mm. This increases ground clearance under the bike and tire clearance under the seat, two known issues with the stock bike. Raising the rear of the bike without changing anything in the front will affect the geometry and stance. Depending on type of riding, bike modifications, and rider preference you may want to use a drop clamp.
All bikes with a 21” front wheel require a drop clamp for tire clearance.
Sirris has tested and tuned with a drop clamp on bikes with 19/18 wheels.
Sirris has not tested and tuned with 19/16 wheels. Our partner athletes racing with 19/16 wheels have been using drop clamps. Running a drop clamp with a 16 inch rear wheel will make the bike more stable at speed but may affect cornering.
Can I buy the Prickly linkage directly from Prickly or dealers?
Yes. Feel free to contact Prickly or any dealers that carry Prickly.
Does the Prickly linkage ship with the R38 shock?
You must add the Prickly linkage to cart with your R38 shock order, they must be purchased at the same time to ship together. But yes, the linkage fits inside the shock box and will ship as a single unit.
OWNER'S GUIDE
R38 for E-Ride Pro SR and 3.0
