We take a spin through the Fox iRD suspension setup app

By Justin Steiner

Here at Dirt Rag and Bicycle Times Headquarters it seems nary a day passes without a delivery person rolling a new bike through the door. Awesome as it is, there are challenges to constantly swapping from bike to bike. In terms of suspension bikes, quickly setting up a new bike at its manufacturer’s recommended baseline is key to kicking off a proper test.

So, it was with much interest yesterday that I watched Matt set up his new Ventana Zeus test bike using Fox’s Intelligent Ride Dynamics (iRD) App.

Fox uses ID Tags on all of their 2013 and newer shocks and forks. These ID tags communicate the necessary info to the app. All you have to do is locate the ID tag and enter the code.


Next, you follow the instructions to select “descend’ mode on the shock, and dial rebound damping to the minimum setting.

Next, you enter your weight, including all riding gear, into the App. Using all the information provided by the ID Tag, the App will recommend a baseline air pressure.

You then mark the sag position by assuming a normal riding position, per the instructions.

With the travel o-ring marking the sag position, you then use the iPhone’s camera to check the sag.

We double checked the iRD app’s recommendation and found it to be right at 22 percent sag. Since Matt wasn’t wearing his hydration pack for this sag measurement, he’ll be at closer to 25 percent sag with a pack, which is a good starting point for this test. With sag set, the iRD app then recommends a rebound setting.

With the rear suspension set up, we moved on to the fork. Again, based on the information from the ID Tag along with the rider weight Matt entered, the iRD app provides a recommended air pressure.

Then you’re back through the process of marking and checking sag.

In this case, the app was spot on first time through. From here, all Matt had to do was adjust rebound damping to the recommended settings and go ride.

I was highly impressed with the app’s ability to simplify what can be a very complex process. The iRD app takes the mystery out of suspension setup, and provides a solid baseline that will should work well for most riders in most situations. I’d wager a vast majority of app users will arrive at better baseline settings than those using the traditional measuring tape approach.

As of now, Fox’s iRD app is available for iPhone, iPod touch, iPad and iPad mini running iOS 4.3 or later. Android and Windows phone people will have to borrow an i-device.


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