Notable manufacturers well known for their long-time use of this suspension design include KHS, Kona, Jamis, Diamondback Bicycles and older Trek Fuels. With single pivot designs, it’s easy to know how pedalling will influence the rear suspension by looking at the pivot location, and how it stands in relation to the chain line. The chain line corresponds to the part of the chain that is in tension. Its location depends on the size of the chainring that is being used, and on what gear is selected on the cassette. If the pivot is on this line or its continuation, the force that is being actuated on the chain has no influence on the suspension. If the pivot is below this line, pedalling will create anti-squat, which will stiffen and rise the suspension (by what degree depends obviously on the vertical distance between the pivot and the chain line). If the pivot is above this line, the pedalling force will cause the suspension to squat. This is a non-desirable trait, however a squatting design has the advantage of lessening pedal kickback. So in all suspension bikes, there is always a compromise between pedalling efficiency and pedal kickback. Heavier riders will suffer less from pedal kickback, so for them a suspension with more anti-squat won’t be as compromised as it might be for lighter riders. The split pivot design is a special case of linkage-driven single pivot in which one of the four-bar's pivot points coincides with the rear axle. This allows for the disc brake caliper to be mounted on the floating linkage (also called coupler) instead of on the swingarm. As a result of this the braking torque now interacts with the suspension via the floating linkage. The linkages can be designed such that this has a positive effect on suspension performance under braking, typically reducing brake jack. Furthermore, the relative rotation between brake disc and brake caliper as the suspension goes through its travel is different from that in single pivot designs. The four linkages in a split pivot design influence how braking torque is transmitted, how the brake caliper moves in relation to the disc and influence the leverage ratio between wheel travel and shock travel. Since these influences may have a different optimum linkage design, the bike's design has to strike a balance. Dave Weagle designed a split pivot which he named "Split Pivot". Trek Bicycle Corporation also released a version of the split pivot design called "Active Braking Pivot" (ABP) in early 2007.