The Specialized Diverge Pro 4 makes rough gravel your playground

Future Shock uses hydraulic damping to control the movement of the spring inside the head tube. A spring by itself will just compress and return the stored energy, which can lead to a pogo-stick-like experience on bumpy roads and gravel. The damper converts some of that energy into heat by forcing fluid through a controlled pathway. The result on nasty terrain is controlled vertical movement rather than a bouncy rebound. 20 mm doesn’t sound like much, especially to anyone accustomed to mountain bikes with 100 mm or more of suspension travel. But Future Shock isn’t trying to keep a wheel planted while you launch off a rock. Its job is to prevent a stream of smaller impacts from traveling through the handlebars, into your hands, arms, shoulders, and eventually your increasingly annoyed brain. And it’s very good at it. Specialized says laboratory testing showed up to a 53 percent reduction in peak impact at the bars versus competing setups. That’s an impressively precise number generated under equally precise laboratory conditions, so don’t read it as “every bump feels 53 percent smaller.” But whatever the decrease, the underlying effect wasn’t difficult to detect, as I felt less arm and upper-body fatigue after long rides than I experience on my own gravel bike. Compression damping can be adjusted on the fly with a dial at the top of the stem, changing how readily the system moves through its 20 mm of travel. At the firmest setting, Future Shock moves very little under normal riding loads; open it up, and the bars move much more freely over bumps. After some experimentation, I left it fully open on nearly every surface. Specialized made a number of other changes from the Diverge Pro 3, all of which are positives in my book. The Diverge Pro 4 sports the bike maker’s mid-range FACT 9r carbon frame with reworked geometry that offers longer reach for better weight centering. With the bottom bracket sitting 5 mm lower, the rider’s center of gravity is lower, contributing to a more planted feel in corners. All told, the Diverge Pro 4 weighs in at 8.72 kg.