Some, such as Santa Cruz’s VPP system, use links that counter-rotate (turn in opposite directions), while many others, such as Giant’s Maestro system, have links that co-rotate (turn in the same direction).
As we’ll see later, the way the centre of curvature migrates as the bike moves through its travel is quite different for each configuration. In fact, twin-link or horst-link bikes with co-rotating links often exhibit anti-squat behavior that’s very similar to a single-pivot bike. While counter-rotating links can produce an anti-squat profile which peaks in the middle of the travel, which may be desirable in terms of balancing pedal efficiency against pedal kickback. This distinction between counter-rotating and co-rotating links is more important in terms of suspension kinematics than the arbitrary distinction between Horst-link and twin-link designs.
