After about 3 months of use and a couple hundred miles, I've noticed that my RS SID XX 120MM solo air sits at about 40-50% sag when the air pressure is set at105psi. I can hold the wheel and pull up on the handlebars and the fork extends to about 10% sag. It returns immediately to the same condition though.
Anyone have experience with this problem? Anything to try before sending it in to have RS look at it.
Sometimes the solo air equalization slot gets plugged with grease. First option is to let all the air out and bottom the fork a couple times while keeping the valve open. It should then be totally bottomed then. Next add air in stages and push down to bottom several times between stages.
The equalization happens at full extension, not compression. The other option is to pump the fork up to ~150psi or so and then forcefully extend it. If you can pull it to full extension then it should equalize and you can set the pressure back to normal.
You need to release pressure from the negative air chamber. Take out the bolt in the bottom of the left leg and shine a light up there. You should see a schrader valve where the bolt was. Stick something in there and press the button (don't stare at it and shoot grease in your eye). The fork should then fully extend. Replace the bolt and set your sag as you normally would.
I tried option 1 , setting the pressure at ~150 and attempted to extend the fork without success. Option 2 worked perfect and it seems to be back to normal. Thanks!
When I pump it up to my normal 110 psi, the travel is so very stiff as if it is at 150 or more.
When I checked the air initially, it was at 100-105, so I let out the pressure and re-pumped to 110. Now it behaves like is has 150 psi or more. It is super stiff, where as before it functioned as it should. Pogo stick in that it is super rebounding and stiff.
You have most likely somehow pressurized the lowers. Take a skinny piece of plastic like the pointy tip of a zip tie, and wiggle it under the dust wiper until you hear some pressure release. Clean the wiper/stanchion off first so you don't get dirt inside. The problem is most likely the left leg but you can check both.
I tried that and didn't make a different. When the air is removed from the spring, the stanchion moves freely through the entire range.
I tried your suggestion of releasing air from the negative chamber through the bottom bolt hole, but only a very small amount was released. After cycling a few times, more air was released each time indicating better chamber equalization. It seems to have resolved itself after cycling and re-pressurizing several times.
When pressurized, cycling the travel a few times, I now get a slight "fsit" sound from within the stanchion as if the air is equalizing between positive and negative chambers. I didn't notice this before, is this normal?
I may have to disassemble and clean in any case.
Should I be able to release all the air in the pos and neg chamber through the bottom valve?
I tried that and didn't make a different. When the air is removed from the spring, the stanchion moves freely through the entire range.
I tried your suggestion of releasing air from the negative chamber through the bottom bolt hole, but only a very small amount was released. After cycling a few times, more air was released each time indicating better chamber equalization. It seems to have resolved itself after cycling and re-pressurizing several times.
When pressurized, cycling the travel a few times, I now get a slight "fsit" sound from within the stanchion as if the air is equalizing between positive and negative chambers. I didn't notice this before, is this normal?
I may have to disassemble and clean in any case.
Should I be able to release all the air in the pos and neg chamber through the bottom valve?
I've had this same problem with my 2015 Reba Solo Air since it was brand new. I used to run 110-120 psi in my old Reba Dual Air and it was perfect. The Solo Air is nearly locked out at this pressure. I'm guessing that the negative air chamber is not filling.
What do you think? Maybe the valve or whatever links the pos & neg chambers needs to be cleaned?
I just remedied my fork by releasing the negative pressure as described. Remove the bolt at the bottom of the left leg and then released the schrader valve underneath. Pumped it up and it is back to normal. Thanks.
I just remedied my fork by releasing the negative pressure as described. Remove the bolt at the bottom of the left leg and then released the schrader valve underneath. Pumped it up and it is back to normal. Thanks.
I did that a couple times, but eventually that didn't work anymore.
I serviced fork by removing lowers and cleaned out air spring side. Grease can fill the small air balancing port that is a groove on the inside of the stanchion. Prevents air from transitioning from negative to positive side.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Mountain Bike Reviews Forum
15.4M posts
515.2K members
Since 1990
A forum community dedicated to Mountain Bike owners and enthusiasts. Come join the discussion about bike parts, components, deals, performance, modifications, classifieds, trails, troubleshooting, maintenance, and more!