This is correct. When you compress a gas pressurized shock, the shock shaft displaces volume inside the sealed portion of the shock body. The nitrogen inside the shock ends up being compressed to compensate for the decreased volume. It acutally has an increasing rate the more you compress the shock.. The Koni 30 series shocks I have on the FFR actually have a 'spring' rate of somewhere between 30 and 50 lb/in.