I weigh 130 lbs with gear and have a 2010 RS Revelation 150mm fork on my Ibis Mojo. I am running 30% sag in back (as this is a DW link bike), and some MTBR posters have suggested that I should have a similar amount of sag up front, even though the RS manual talks about 15-25% sag.
So assuming that I want 30% sag, that's 45mm. In order to get that, MTBR posts have said that I start with the negative pressure at zero, and increase positive pressure until I get the right amount of sag. I then add negative pressure until it causes the fork to start sagging when I'm off the bike.
Following those instructions, I have found that I get 30% sag if I have 50 psi positive and about 22 psi negative. Those numbers are much lower than RS recommendations of 90-115 psi. However, my fork feels fine on rides.
Do my numbers make sense?
Can I damage the fork if I have too low pressure?
I have tried higher numbers such as 70 positive and 50 negative, but I find that while I can get 30% sag, the fork tends to sag a lot even when I'm off the bike.
Also, I was trying to find a way to get the negative pressure close to the positive pressure so that I can have more small bump compliance, but couldn't find a winning combination.
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