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Message: [QUOTE="Richard S., post: 1362868, member: 109682"] enduro, the WP "rule of thumb" is 90/10. In other words, the oil should take up 10% of the reservoir and the n2, 90%. So, this is easy to calculate: Do not worry about the diameter of the reservoir body, only the length. If the length is 100mm, your piston height is 10mm. ALWAYS measured DOWN from the top-end of the reservoir (closest to the compression adjuster, in other words). Just always remember, 10% oil, 90% nitrogen. :cool: [/QUOTE]