I am going to check the sag on it and that's how I determine the air pressure that I want. So I will slide the rubber hovering up against the shock. I am going to climb up very carefully onto the bike, and then sit on it gently. Climb off very carefully.
This is a 6.5 inch long rear shock, eye to eye distance, and generally will have a stroke length of 1.5 inches. So that's going to determine how much possible travel you have in the rear. If you have a 2:1 leverage ratio, which this bike does, then that means for every 1 inch of travel you get here, you get 2 inches of travel of the rear wheel. That's the 1.5 inches that it can move.
You want to have your sag about 25% of that length. So 25% of 38 is 9.5 millimeters. So we have about 7.5. So we need to reduce the pressure in the rear shock. Here is the straight, move it here, put on the shock pump. Now, it just jumped up to 120, 121, and like with the fork, you loose about 10 PSI of pressure in taking the air that's in this chamber and filling this section up to the same pressure.
So I probably had it at a 130 PSI. So I am going to go at 130, and I am going to climb very carefully onto the bike. I am going to check sag again. It's about 9.5. I am happy with that. 120 PSI gives me 25% of travel length from my sag, and I am going to write that down.
FOX RP3 has three positions that control what happens on compression. It controls the inertia valve that separates bump forces from rider induced forces through peddling. When you have it in this position, which is akin to the normal lockout position, it's the highest bump threshold. This position, there is less pedal platform, so it takes less of a bump to get the thing moving, and it still has some platform to push against. It's not just bobbing completely when you are pedaling.
Even in this position, there is still some pedal platform, but it's much freer to move when it encounters bumps. To check rebound, really simple thing is to do a curb test. Ride the bike off a curb, and while you are sitting on the seat, and then you want one bounce. If it bounces back and does a few bounces, like that, you can tighten up the rebound damping and eliminate that.
Then this dial, when you look from the front and turn it clockwise and counterclockwise. Fully counterclockwise is fully open rebound and then I have got nine clicks. So about five clicks back would be in the middle, I will place my cap, and I am ready to ride.
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