essentially the o-ring does not really 'grip' on the shock shaft (unless you haven't used any oil to build them) so the softness of the the o-ring does not have the same effect as the softness of a tire on a track as an example.
its all about the force exerted on the shaft by the o-rings, they are all the same size, they all fit into the same place. its just about how easily they are to squash into that place.
its also why o-rings 'go bad', basically, they just swell up and exert more force on the shaft causing more drag than when they are first fitted.
I have found with the softest Blue Durango o-rings that even when they have swelled up a bit they still feel really free and smooth.
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Chris Doughty
Team Durango
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