Radflo 2.0 Hydraulic Bump Stop - 2", 3" & 4" Travel
5SB-001-00
The Radflo 2.0 Hydraulic Bump Stop provides progressive impact control during the final inches of suspension compression, helping reduce harsh bottoming and stress on the chassis, suspension components, and occupants. Designed for demanding off-road applications, this nitrogen-charged hydraulic bump stop uses velocity-sensitive damping to increase resistance during severe impacts. Its 2.0" steel body, 1.25" chrome-plated alloy steel shaft, and rebuildable internal components deliver dependable performance for rock crawlers, Ultra4 race cars, prerunners, and custom off-road buggies.
Available with 2", 3", or 4" of travel, the Radflo 2.0 bump stop can be matched to available suspension travel, vehicle weight, and chassis packaging requirements. Its Freeflo Racing Piston, deflective disc valving, and high-temperature suspension fluid provide controlled compression during hard landings and extreme suspension movement. Each unit is serviceable and tunable, allowing builders to adjust damping characteristics for different terrain, suspension geometry, and driving conditions.
Includes:
- (1) Radflo 2.0 Hydraulic Bump Stop – Selected Travel Length
Note: Sold individually. Bump pads, bump cans, and bump can mounting hardware are sold separately. Select the correct travel length before ordering.
Specifications
| Manufacturer | Radflo Suspension Technology |
|---|---|
| Product Type | Hydraulic Pinch-Mount Bump Stop |
| Body Diameter | 2.0" |
| Available Travel Lengths | 2", 3" & 4" |
| Shaft Diameter | 1.25" |
| Shaft Material | Mirror-Polished Alloy Steel |
| Shaft Finish | Chrome Plated |
| Body Material | SSID Alloy Steel Tube |
| Body Finish | Clear Cadmium Plated |
| Body Caps | CNC-Machined 6061 Aluminum |
| Body Cap Finish | Black Anodized |
| Rod Guide | CNC-Machined Bronze with PTFE Coating |
| Piston | Radflo Aluminum Freeflo Racing Piston |
| Seal Design | Rebuildable Quad-Ring & Lip Seal Combination |
| Valving Type | Velocity-Sensitive Deflective Disc |
| Valving Adjustment | Self-Adjusting / Velocity-Sensitive |
| Valving Tuning | Consumer or Factory Tunable |
| Oil | Radflo High-Temperature Foam-Resistant Suspension Fluid |
| Pressurization | Nitrogen Gas |
| Published Nitrogen Pressure | 200 PSI |
| Mounting Style | Pinch Mount / Compatible Bump Stop Can |
| Serviceability | Consumer or Factory Serviceable |
| Primary Application | Off-Road Suspension Bottom-Out Control & Impact Absorption |
| Quantity | (1) Bump Stop / Sold Individually |
Available Travel Configurations
| Part Number | Travel Length | Body Diameter | Shaft Diameter |
|---|---|---|---|
| 5SB-001-00 | 2" | 2.0" | 1.25" |
| 5SB-002-00 | 3" | 2.0" | 1.25" |
| 5SB-003-00 | 4" | 2.0" | 1.25" |
Travel Selection: Shorter travel options provide a compact solution for limited mounting space, while longer travel options allow hydraulic damping to begin earlier in the compression cycle. Select travel based on suspension geometry, available clearance, and intended bump stop engagement.
Nitrogen Note: Radflo lists 200 PSI in the supplied specifications. Confirm the correct service pressure and tuning requirements for your specific application before charging or adjusting the bump stop.
Fitment
Universal Off-Road Suspension Application
Designed for custom suspension systems using compatible 2.0" hydraulic bump stop mounting cans or clamps.
Common Applications:
- Rock Crawlers & Rock Bouncers
- Ultra4 Race Cars
- Prerunners & Desert Racing Trucks
- Custom Tube-Chassis Buggies
- Heavy-Duty Trail Rigs
- Long-Travel Off-Road Suspension Systems
- High-Speed Off-Road Race Vehicles
Fitment & Installation Notes:
- Designed for compatible 2.0" hydraulic bump stop mounting cans or pinch clamps.
- Available in 2", 3", and 4" travel configurations.
- Verify bump stop body diameter and mounting can compatibility before ordering.
- Select travel length based on available suspension travel, chassis clearance, and desired engagement point.
- Mock up the bump stop and strike pad before final welding.
- Cycle the suspension through full compression to verify bump stop alignment and available clearance.
- Position the bump stop so the shaft contacts a flat, reinforced strike pad as squarely as possible.
- Check clearance around axle housings, tires, shocks, suspension links, and steering components.
- Final valving and nitrogen pressure tuning may be required for vehicle weight, suspension leverage, and intended terrain.
- Professional installation and suspension tuning are recommended.
Builder Note: Hydraulic bump stops should be positioned during suspension mockup with the shocks, links, axle, and tires installed. Establish the desired engagement point before final welding and verify that the bump stop has sufficient travel to control compression without becoming the suspension's unintended mechanical limit. Proper strike pad alignment, mounting strength, and tuning are essential for predictable bottom-out control.
FAQ
What does a Radflo hydraulic bump stop do?
A hydraulic bump stop acts as a secondary damper during the final portion of suspension compression. It absorbs impact energy and progressively slows suspension movement, helping reduce harsh bottoming and stress on the chassis, suspension components, and occupants.
What is the difference between 2", 3", and 4" travel bump stops?
The difference is the available compression stroke. A 2" bump stop is easier to package in tight suspension layouts, while 3" and 4" versions provide additional damping travel. The correct choice depends on suspension geometry, available clearance, vehicle weight, and desired engagement point.
How does velocity-sensitive damping work?
Velocity-sensitive damping increases resistance as the bump stop shaft compresses faster. Slow suspension movement produces less damping force, while hard landings and severe impacts generate greater resistance to help control bottom-out.
Why use a hydraulic bump stop instead of a rubber bump stop?
A conventional rubber bump stop primarily provides a physical cushion near the end of suspension travel. A hydraulic bump stop adds controlled damping, slowing suspension compression and absorbing energy before the suspension reaches its mechanical limit.
What size shaft does the Radflo 2.0 bump stop use?
The Radflo 2.0 Hydraulic Bump Stop features a 1.25" diameter chrome-plated alloy steel shaft with a mirror-polished surface and PTFE-coated bronze rod guide for strength, smooth operation, and reduced friction.
What is the Radflo Freeflo Racing Piston?
The Radflo Freeflo Racing Piston is an aluminum piston designed to control hydraulic fluid movement through the bump stop. Combined with velocity-sensitive deflective disc valving, it provides controlled compression resistance during suspension impacts.
Can Radflo hydraulic bump stops be rebuilt and tuned?
Yes. Radflo 2.0 hydraulic bump stops are designed to be serviceable and tunable. Internal valving can be adjusted to suit different vehicle weights, suspension designs, terrain, and driving conditions.
What nitrogen pressure does the Radflo 2.0 bump stop use?
The supplied Radflo specifications list 200 PSI nitrogen pressure. Confirm the appropriate pressure and service procedure for the specific bump stop and application before making adjustments. Use dry nitrogen and suitable high-pressure charging equipment.
Does the Radflo bump stop include a mounting can?
No. This listing includes one hydraulic bump stop in the selected travel length. The mounting can, mounting tabs, and strike pad are sold separately.
How should a hydraulic bump stop be mounted?
The bump stop should be securely mounted in a compatible can or clamp and aligned with a reinforced strike pad. Cycle the suspension through full compression before final installation to verify proper engagement, shaft alignment, and clearance.
Why is hydraulic bump stop tuning important?
A bump stop that provides too little resistance may allow harsh bottoming, while excessive damping can create a sharp impact and upset chassis stability. Proper tuning helps control suspension compression without making the vehicle unpredictable during hard landings or rough terrain.
