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  1. #1
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    Weird Rear Shock Problem

    Ok, I have Cane Creek AD12 rear shock ( I know its old ). Last week I couldnt get it to hold pressure, so I ordered a rebuild kit and my LBS serviced it. I picked it up, road it for 2 min around the place and the pressure was gone again.

    After about 15 min of trying to find the problem, I figured it out. As soon as I lean into a hard turn, left or right, and the shock compresses it blows out the air.... Is it the frame, shock, or bushings? I'm lost, the tech is too.

    I have a Weyless SP frame Mint condition... Here are the rest of my specs just for fun

    Weyless SP frame
    Rear Shock: Cane Creek AD-12 (shock has compression and rebound damping )
    Fork: Marzocchi Bomber XC-600 w/120mm travel
    Cranks: Truvativ Hussefelt
    BB: Raceface DH (outboard bearings)
    Shifters: Sram X-9
    Rear der: Sram X-9
    Front der: Shimano LX
    Cassette: Sram
    Headset: FSA Orbit Extreme
    Stem: Ringle 100mm
    Handlebar: Truvativ XR
    Grips: Cane Creek (lock on)
    Brake Levers: Cane Creek Direct Curve
    Brakes: Avid BB-7
    Seatpost: Weyless
    Seat: WTB SST-X
    Wheel set: Sun Ringle Disc Jockey
    Tires: WTB Weirwolf 2.5 (folding bead)

  2. #2
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    Quote Originally Posted by dparish2 View Post
    Ok, I have Cane Creek AD12 rear shock ( I know its old ). Last week I couldnt get it to hold pressure, so I ordered a rebuild kit and my LBS serviced it. I picked it up, road it for 2 min around the place and the pressure was gone again.

    After about 15 min of trying to find the problem, I figured it out. As soon as I lean into a hard turn, left or right, and the shock compresses it blows out the air.... Is it the frame, shock, or bushings? I'm lost, the tech is too.

    I have a Weyless SP frame Mint condition... Here are the rest of my specs just for fun

    Weyless SP frame
    Rear Shock: Cane Creek AD-12 (shock has compression and rebound damping )
    Fork: Marzocchi Bomber XC-600 w/120mm travel
    Cranks: Truvativ Hussefelt
    BB: Raceface DH (outboard bearings)
    Shifters: Sram X-9
    Rear der: Sram X-9
    Front der: Shimano LX
    Cassette: Sram
    Headset: FSA Orbit Extreme
    Stem: Ringle 100mm
    Handlebar: Truvativ XR
    Grips: Cane Creek (lock on)
    Brake Levers: Cane Creek Direct Curve
    Brakes: Avid BB-7
    Seatpost: Weyless
    Seat: WTB SST-X
    Wheel set: Sun Ringle Disc Jockey
    Tires: WTB Weirwolf 2.5 (folding bead)
    The shock should install in the frame mounts w/o having to push the shock sideways. Remove the shock & rear wheel & twist on the swingarm should not move sideways. If no play is felt remove the swingarm and check the bearing / pivot fit & condition.
    Last edited by keen; 04-04-2013 at 10:44 PM.

  3. #3
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    Air is passing by the air can slider seal only while turning hard compresses the suspension? It sounds like the suspension may be flexing excessively from loose pivot bearings. The suspension bearings could be so worn that the shock mount becomes misaligned from the cornering side loaded swingarm flex, and is too much twist to the shock and opens the air seal during those side loaded conditions.

  4. #4
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    Ok, tomorrow I'll take off the shock at the pivot arm and the rear wheel and check for play. Thanks guys, I'll report tomorrow.

  5. #5
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    Checked for play, there was zero.... maybe the wing arms are just worn out, I have no idea.

  6. #6
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    Does anyone think that a coil over shock would be a solution?

  7. #7
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    Quote Originally Posted by dparish2 View Post
    Does anyone think that a coil over shock would be a solution?
    Or Air. Coil, without the big air seal, is certainly more durable over the years to frame flex. Yes, a new shock if the AD12 shock is now worn enough that it can't seal well.

    But if the suspension pivot bearings are worn enough a new shock won't last very long. The suspension or shock may have no slop in some positions, but near the most cycled area just below sag travel the suspension pivots and shocks wear out first, this is the travel area you say where the shock leaks air only during cornering. New pivot bearings are normally not very expensive to get replaced.

  8. #8
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    I put on my old SID XC rear shock with some custom bushings I made and it worked great. The pivot bearings feel very solid no play or flex at any angle, I guess that AD12 was just done. Im going to replace pivot bearings as soon as I can figure out what size they are, the weyless frame has zero specs about it......

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