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[QUOTE="terry hay, post: 686879, member: 48273"] Jeremy Your comments about the progressive and straight rate springs are completely valid. But whats the solution? Paul Thede has certainly taken up the challenge with his latest offering for the KTMs and his springs appear to work better than the others. However they still fall short of the ideal in my opinion. The RaceTech springs emulate the performance of a straight rate until appr. 70mm of compression where a dramatic transition occurs and the rate increases significantly. I would prefer to see the rate inrease a little earlier and more gradually. Your work with the PDS needles sounds interesting but rather convaluted. Why not try a two stage stack on the secondary piston? The crossover point is completely tunable as is the degree of damping. You may achieve the effect you desire with a lot less effort. The bottom out bumper on the KTMs is too soft to offer any serious halting of momentum and could also be addressed. The bump rubber that Showa produce for the XR 650 does a much better job. It has a much higher duro rating and is a little longer. When trying to find a solution for the PDS we can't blame just one area. It's the sum of all the parts. Position sensitive damping was never going to be easy. I'm coming to the States in just over a week to release a new suspension development. I'll be hooking up with Larry Rosseller and trying a few things with his KTMs as soon as he gets back from Baja. We will also be testing a variety of springs which we have in prototype form. I'll keep you posted. [/QUOTE]
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Some stuff too good not to share...
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