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Dynamics
Overview:
The dynamics of a bicycle in motion creates a rocking motion, meaning that each end arcs around the other end. More specifically, the rear wheel moves on an arc that has the front axle as its center, and the front wheel moves on an arc that has the rear axle as its center.Compression:
As the bump lifts the rear wheel, the rear wheel pushes the saddle up and forward into the rider. The Thudbuster compresses along the exact opposite path (down and rearward) to absorb the force. The Thudbuster moves down and rearward at the same rate as the bump moves up and forward, so the net movement means the rider is unaffected by the bump.Telescoping Design:
Telescoping suspension seatposts have a compression stroke in the vertical plane. As the bump force travels up and forward through the rear wheel, the seatpost suspension is more than 50 degrees out of line with the bump forces. Since 90 degrees out of line is a complete mechanical lockout, telescoping seatposts are halfway to lockout by design. This mechanical bind makes the telescoping designs much less efficient than the fully active Thudbuster design.Test Lab:
A recent study in Germany measured the effect of different suspension set-ups on absorbing performance robbing bumps. Understandably, the lower back was found to be particularly susceptible to bumps, amplifying the importance of rear suspension. And, interestingly, a suspension seatpost was found to be almost as effective as a rear-suspension frame in absorbing these bumps. Considering that the post used in the test was an inferior telescoping design, the Thudbuster's unique design can make a provably significant contribution to performance and comfort.Reproduction of this material without written permission is strictly forbidden. © 2002-2008 R.J. Concepts, Inc. All rights reserved.
Thudbuster R.J. Concepts 2951 North Plaza Drive, Suite 103 Rapid City, SD 57702 Phone (605) 718-7736 fax (605) 342-3233