Radflo 500R Sport 2.0: First Look on the 2025 Toyota 4Runner

Welcoming Radflo to the Shock Surplus Lineup

You heard it here first… we're proud to now offer Radflo Suspension Technology's full catalog here at Shock Surplus!

To celebrate, we got our hands on their newest model line, the 500R Sport 2.0s, and installed them on Jeff's brand-new 2025 6th Gen Toyota 4Runner.

This is just the beginning of our testing with Radflo's expanding lineup and all the new suspension options coming to the latest 4Runners. We'll be diving deep into how they stack up in the real world, so stay tuned.

What Are the 500R Sport 2.0s?

The 500R Sport 2.0 line is Radflo's response to everyday drivers who still want performance and comfort.

While they're best known for race-ready setups (rock bouncers, crawlers, buggies, and desert trucks) this new series focuses on OEM+ ride quality and long-term reliability.

We're testing the non-reservoir (IFP) versions on our 4Runner, but Radflo also offers remote reservoir options for added heat management.

Key features include:

• 2" steel threaded shock bodies
• OE-style bushings and mounts for better noise and vibration control
• Spring seat insulators for reduced harshness
• Serviceable, rebuildable design for OEM-like longevity
• Progressive rebound piston to reduce harsh top-outs; similar to Fox 2.5 HTOs or OME MT64s

That last feature is a big one, it gives the shock a more composed rebound feel, especially when limited by factory-length travel.

Lift Options and Compatibility

The 500R coilovers are available in:

• 0–2" lift for use with stock upper control arms
• 0–2.5" lift for setups with aftermarket UCAs

Rear shocks are designed to handle stock height up to 2" of lift, with longer options available for those pushing higher.

We expect the 500Rs to deliver plush daily-driver comfort with enough control for light trails and weekend adventures. The design is clearly aimed at real-world users; people who spend more time on pavement than dunes but still want a confident, composed ride.