While large-volume tires with low pressures can do a fantastic job of smoothing out rough roads, they come with their disadvantages. Lower pressures can increase rolling resistance on smooth surfaces while also risking tire damage on rough terrain. By introducing suspension systems for gravel bikes, the rider gets the benefit of extra comfort without compromising tire pressures or component choices. Gravel suspension can be categorized into two types, active and passive.
Passive systems rely on built-in frame compliance using slender tube shapes and blends of carbon designed to be flexible. The advantages of a passive system are that it adds very little extra weight and is maintenance-free.
Active suspension takes the form of suspension forks, stems, and seatposts or pivoted flex that uses a damper. These systems will all use a damper and pivot points to absorb impacts and vibrations. Active systems usually offer a more isolating experience as they have more travel and can better manage the direction of absorption.