While some bikes have literally been ready for this for four or more years, Fox wanted to make absolutely sure the system was ready for prime time. After all, the new Fox Live Valve electronic compression damping system is being asked to monitor the terrain 1000x per second and make adjustments in 3 milliseconds. That’s 100x faster than the blink of an eye. In real world terms, that’s so fast that the sensor on the fork detects the impact and opens the compression valve before you feel it at the handlebars. It’s the fastest valve they’ve ever created.
It also detects how you’re riding and adjusts accordingly. Pitch detection knows the you’re climbing, traversing or descending and adjusts accordingly. Dive into a corner and it’ll firm up a bit so you can rail it then power out of the exit. Airborne? It’ll open things up to absorb the impact.
The goal? Perfect suspension performance with out you ever having to touch a dial.
How does Fox Live Valve work?

For years, Fox has tried all manner of designs and technologies to get closer to this. From the brass mass in their Terralogic forks to the iCTD and FLOAT iCD electronic remotes. The latter used a Di2 battery, but the new Live Valve gets its own battery with integrated controller. To finally get where they wanted to go, they came up with the following design considerations:
- Light weight
- Low power consumption
- Fast valves in a very small package
- Requires new technology they would have to build from scratch
- Would require new data on how the suspension would act
- Water bottle clearance and various shock mount designs to fit most frames
- User friendliness
The system, in a nutshell, is an magnetically activated compression damping valve controlled by a micro-computer which uses sensors to detect movement at the fork and rear axle. Hit a bump and the system opens the valve, switching from “closed” to “open”. How “closed” or “open” those settings are is mostly up to the bike manufacturer to specify for each specific model, but the “open” has an additional external adjustment for you to fiddle with. How much force it takes to open the valve is also user adjustable.
The heart of the system is a small Latching Solenoid, which requires just a 25 millisecond pulse of electricity to move. It’s then held in the open position with a magnet, and the closed position with a spring. So, there’s no power consumption to hold it in either position. To close it, the system turns on a small electromagnet to cancel the permanent magnet so the spring can push the valve back to the closed position. It’s either open or closed, there are no intermediate (aka “Trail”) positions because those would require constant power to hold it in those positions.
Why not just put a motor on the compression knob? Two reasons. First, that, too, would use more power to turn, and on bikes we’re limited to how much battery weight we want to carry around. Second, speed. That would be too slow to adjust and react. So they had to completely redesign the internal valving and shim system to work with a different type of mechanism.

The same system is used for the fork and the shock, only the valving and carrier parts change between models (34 versus 36, etc.).
Sounds simple, right? Almost limiting? There’s more to it. The electronics allow them to do waaaay more with those two positions than you could ever do flipping a manual switch back and forth.
Fox Live Valve parts and tech
Can you tune Fox Live Valve yourself?
OK, but why?

Video overview of Fox Live Valve:
How much will Fox Live Valve cost?
