The differences between the PRST4 and JW4 are fairly limited. The front suspension works identically but the PRST has a lighter box section fork, rather than the JWs tubular. The only other difference is the "Big Gripper" drop outs on the PRST. You attach aluminium "cotton bobbins" to the wheels and they are clamped in place by unique devices. The aim, and it's quite successful, is to give the rigidity of a through axle before such things were available. The linkage front ends are great and prevent bobbing as long as you set the shock pressures high enough. With a coil shock you need to set the preload high enough. As soon as you hit a bump the front wheel is pushed backwards, which activates the suspension. They have good small bump response and steer where you point them. I just need a 150mm travel version and wouldn't want to ride any other bike! (Except for comparison, nostalgia etc. etc.)
