Radflo 2.5 External Bypass - Piggyback – 3 Tube – 7/8” Shaft
6BP-302-00
The Radflo 2.5 3-Tube Bypass Shock with Piggyback Reservoir delivers externally adjustable damping control in a compact package for rock crawlers, rock bouncers, trail rigs, Ultra4 cars, and custom off-road vehicles. The three bypass tubes allow damping to change through different portions of the shock travel, helping improve ride quality, traction, chassis control, and bottom-out resistance as terrain and suspension load change.
The piggyback reservoir mounts directly to the shock body, increasing oil capacity and heat management without requiring external reservoir hoses or separate reservoir mounts. This makes the 2.5" piggyback bypass a strong choice for builds where suspension tuning and cooling matter but chassis space and packaging are limited.
Includes:
- (1) Radflo 2.5 3-Tube Bypass Shock
- Piggyback Reservoir
- Universal Spherical Bearings
- Mounting Hardware
Availability Note: As the #1 stocking warehouse for Radflo, we stock a large selection of Radflo shocks and suspension components for immediate shipment. Custom-valved and special-order configurations may require 4–6 weeks for production and delivery.
Need parts quickly or have ordering questions? Call us for current inventory availability and help selecting the correct shock configuration for your build.
Specifications
| Specification | Details |
|---|---|
| Manufacturer | Radflo |
| Product Type | 3-Tube Bypass Shock with Piggyback Reservoir |
| Shock Body Diameter | 2.5" |
| Travel Options | 10", 12", 14" or 16" |
| Shaft Diameter | 7/8" (0.875") |
| Rod Material | Nitro Steel |
| Rod Finish | Mirror Polished |
| Body Material | SSID Alloy Steel Tube |
| Body Finish | Clear Cadmium Plating |
| Body Caps / Eyelets | CNC-Machined 6061 Aluminum |
| Body Cap Finish | Black Anodized |
| Bypass Tubes | 3 |
| Reservoir Type | Piggyback |
| Bearing Size | 5/8" (0.625") |
| Mounting | Universal Spherical Bearing & Hardware |
| Rod Guide | CNC-Machined Bronze with PTFE Coating |
| Piston | Radflo Aluminum Freeflo® Racing Piston |
| Seal System | Quad-Ring & Lip Seal Combination |
| Valving Type | Velocity-Sensitive Deflective Disc |
| Valving Adjustment | External Bypass Adjustment |
| Valving Tuning | Consumer or Factory Tunable |
| Oil | Radflo High-Temp Foam-Resistant Suspension Fluid |
| Pressurization | Nitrogen Gas |
| Nitrogen Pressure | Starting at 200 PSI, Application Dependent |
| Serviceability | Rebuildable & Serviceable |
| Sold | Individually |
Fitment
Universal shock for custom front or rear off-road suspension applications.
Common Applications:
- Rock Crawlers
- Trail Rigs
- Jeep Suspension Builds
- Rock Bouncers
- Ultra4 Cars
- Custom Tube Chassis Vehicles
- Off-Road Race Vehicles
- High-Performance Off-Road Builds
Fitment Notes:
- Verify shock travel, compressed length, extended length, and mounting clearance before ordering.
- Piggyback reservoir clearance must be checked through the full suspension cycle.
- Final valving and bypass adjustment should be matched to vehicle weight, suspension geometry, terrain, and intended use.
- Confirm tire, chassis, link, spring, and steering clearance before final shock placement.
- Professional suspension setup and tuning are recommended for high-performance applications.
FAQ
What is the difference between a piggyback reservoir and a remote reservoir?
A piggyback reservoir mounts directly to the shock body, eliminating external reservoir hoses and separate reservoir mounts. It still increases oil capacity and helps manage heat, but requires enough chassis clearance around the shock body for the integrated reservoir.
What does a 3-tube bypass shock do?
A 3-tube bypass shock allows damping to be adjusted through different zones of the shock travel. This lets the shock react more freely in some portions of travel while increasing damping where additional chassis control or bottom-out resistance is needed.
When should I choose a bypass shock instead of a standard smooth-body shock?
A bypass shock is useful when the suspension needs more tuning control than a conventional shock can provide. They are commonly used on vehicles that see high-speed terrain, repeated impacts, aggressive rock crawling, racing, or suspension setups where precise control through different portions of travel is important.
Is a piggyback bypass shock easier to package than a remote reservoir shock?
It eliminates reservoir hoses and separate reservoir mounts, which can simplify installation. However, the attached reservoir adds size around the shock body, so clearance must still be verified through full steering and suspension travel.
Are Radflo 2.5 piggyback bypass shocks rebuildable and tunable?
Yes. These shocks are rebuildable and serviceable, and the bypass system allows external damping adjustment. Internal valving can also be tuned to better match vehicle weight, suspension geometry, and intended terrain.
