Radflo 2.5 DRT Internal Bypass Coilover Shock – Remote Reservoir & Compression Adjuster
6CV-001-9A
The Radflo 2.5 DRT Internal Bypass Coilover combines race-proven internal bypass technology, remote reservoir performance, and dual compression adjustability into a single compact package. At the heart of the system is Radflo's proprietary RST Dynamic Ride Technology (DRT), which combines both velocity-sensitive damping and position-sensitive damping within a single shock absorber. This allows the suspension to remain supple over small chatter, roots, rocks, and bumps while increasing damping force deeper into the travel for superior control during larger impacts.
Unlike traditional coilovers that force all fluid through the piston throughout the entire stroke, DRT shocks utilize internal circuits that allow fluid to bypass the piston in specific travel zones. The result is increased small-bump compliance, improved traction, enhanced ride comfort, and a noticeably more controlled suspension feel across varying terrain.
Combined with a remote reservoir and available dual high-speed and low-speed compression adjusters, the DRT Internal Bypass Series delivers race level performance for rock crawlers, Ultra4 vehicles, prerunners, Jeeps, trucks, UTVs, and custom off-road builds.
Includes:
- (1) Radflo 2.5 DRT Internal Bypass Coilover Shock
- Remote Reservoir
- Universal Spherical Bearings & Mounting Hardware
- JIC/ORB Reusable Hose Fittings
• Springs Sold Separately
• Sold Individually
Specifications
- Brand: Radflo Suspension Technology
- Series: DRT Internal Bypass
- Shock Type: Coilover with Remote Reservoir
- Body Diameter: 2.5"
- Shaft Diameter: 7/8"
- Travel Options: 8", 10", 12", 14", 16", 18"
- Adjustability: Compression Adjusters
- Valving: Velocity-Sensitive Deflective Disc
- Internal Bypass: Proprietary RST Dynamic Ride Technology
- Reservoir: Remote Reservoir
- Piston: 2.0" 6061-T6 Billet Aluminum RST HiFlo Race Piston
- Piston Finish: Type II Hard Anodized
- Body Material: SSID Alloy Steel
- Body Finish: Zinc Plated with Clear Coat
- Rod Material: Stainless Steel or Hardened Steel
- Rod Finish: Mirror Polished Chrome Plated
- Rod Guide: Machined Bronze with PTFE Coating
- Seal System: 3-Stage Redundant Seal Cap with Mechanical Scraper
- Bearings: FK Heat-Treated Steel Spherical Bearings, PTFE Lined
- Body Caps: CNC Machined 6061 Aluminum
- Body Cap Finish: Black Anodized
- Oil: Radflo High-Temp Foam Resistant Suspension Fluid
- Pressurization: Nitrogen Gas
- Tuning: Consumer or Factory Tunable
- Serviceability: Consumer or Factory Serviceable
- Country of Origin: USA
Fitment
Universal fitment for custom suspension applications including:
- Rock Crawlers
- Ultra4 Race Vehicles
- Desert Race Trucks
- Prerunners
- Jeep Builds
- Truck & SUV Suspension Systems
- UTVs & Side-by-Sides
- Custom Tube Chassis Vehicles
Verify travel length, spring requirements, mounting dimensions, and suspension geometry prior to ordering.
Tech Insight
How does an internal bypass shock differ from a standard coilover?
A standard coilover generates damping almost entirely through the piston and shim stack. An internal bypass shock adds additional fluid pathways that change damping force depending on where the shock is in its travel. This allows a smoother ride over small bumps while providing significantly more support during larger impacts.
What is the difference between internal bypass and external bypass shocks?
External bypass shocks use visible external tubes mounted to the shock body. Internal bypass shocks create similar damping zones inside the shock itself.
Internal Bypass Advantages:
- More compact packaging
- Easier installation
- Less maintenance
- Cleaner appearance
- Excellent ride quality
External Bypass Advantages:
- Maximum tuning range
- Independent external adjustments
- Preferred for professional race applications
For most enthusiasts, an internal bypass shock delivers much of the performance benefit of an external bypass system in a simpler package.
Will an internal bypass shock ride better than a standard coilover?
In most applications, yes. Internal bypass technology improves:
- Ride quality
- Small bump compliance
- Tire contact
- Driver comfort
- Suspension control
while maintaining excellent bottom-out resistance.
What does "position-sensitive damping" mean?
Position-sensitive damping means the shock behaves differently depending on where the piston is located within the travel. The damping curve changes as the suspension moves through Ride Zones and Build Zones.
What does "velocity-sensitive damping" mean?
Velocity-sensitive damping means the shock responds differently depending on shaft speed. Faster shaft speeds create more damping force, helping absorb impacts and maintain control.