Not totally sure, but as far as I recall, I think they recommend raising the forks through the yokes by 5mm when fitting them. Which would achieve the same effect on the geometry as raising the rear with increased preload, but without the side effect of loosing sag/comfort/traction at the rear. If you're a heavy bloke, then you may well be riding too low at the back (relative to the front) now you've got better/newer/stiffer springs fitted up front?

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