I've just been adjusting the spring pressure on my Rock Shox SID XX fork and then adjusted my Manitou Minute Expert because I had the pump out. The SID has the solo air spring and needed 115psi and the Minute has the ACT spring and only needed 20psi. Whats the difference between high and low pressure systems and what is the benefits of each?
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To add to Daniel's comment, there is no real benefit/detriment to one vs the other, but you are going to find that rear shocks are typically higher pressure for a few reasons: