![]() This is particularly so with the negative air spring that has a very small volume of air, so letting even the smallest amount out will change the pressure drastically. If you connect your pump to check the air spring pressure you will end up with a lower value because you have had to let air out of the air spring to fill up the pump hose and guage. You only get an accurate reading on the air spring pressures when you are pumping the air spring up. Here's what Rockshox has to say about the negative air spring. The negative air pressure acts on a much smaller surface area because of a smaller diameter air head and the presence of the air spring rod through the middle of the negative air spring reservoir. You might be wondering why the fork doesn't collapse with equal positive and negative air pressures? Well, if you take a look at the air spring assembly you will see that the positive air pressure acts on the entire surface area of the air spring head. You'll get a really good idea of what the negative air spring does this way. If you've got the time, I'd go for a quick ride with no pressure in the negative air spring and then another quick ride with the same pressure as in the positive air spring. Rockshox recommend matching the negative air pressure to the positive air pressure. More negative air pressure makes the fork "plusher" in its initial travel. Negative air pressure influences how easily the fork begins to compress. Once your fork is fully dialed in you may want to revisit these sag settings and tweak them further within the 20-30% range to get things just perfect. The SID's have sag % markings on the fork legs. It helps if you've got someone to help you measure the sag. To measure the sag you need to be balanced on your bike in the attack position. Use this pressure as a starting point.Ĭheck that you've got the pressure right by measuring the amount of sag. ![]() The fork has a rough air pressure guide on a sticker on the fork leg. ![]() ![]() This is the first thing you want to tweak. The positive air spring provides the pressure in the fork that holds you up. The 2009/2010/2011 Rockshox SID Race forks have the following adjustments: ![]()
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