I don't claim to understand the mechanics involved, but I think it's the equivalent of regenerative braking for suspensions. Instead of wasting the energy when

I don't claim to understand the mechanics involved, but I think it's the equivalent of regenerative braking for suspensions. Instead of wasting the energy when you cross a bump, it stores it and converts it into forward motion. Pretty smart if it's so, and depending on road conditions I actually see it as having noticeable effect. Especially considering how crazy people are about upgrading their bikes.