Repair from Fox only apparently that included: you may also feel a slight knock when you stop (related to above symptom). Shock moves through that first few millimeters quickly, way too quickly. Once the oil is really well mixed with air, the shock will make a very quiet 'squish' noise when moving through the very first few millimeters of travel (that's the damper air/oil moving past the seal and mixing with the damper oil/air.) Once it fails, damping gets progressively worse. The issue is with the device that keeps the damper air(nitrogen) and damper oil separate. Apparently it is a known fault - the fault isn't that common but it happens in the same way each time.Īpologies in advance for the description - I didn't really understand anything I was told!: The mechanic at the MTB park had a look, thought he recognized the issue and called Fox to confirm. I had a similar issue with my RP23 from a Specialized Enduro while on holiday in New Zealand. Are there any brands of shock oil that are known to be significantly more thermally stable? I'd think not, or wouldn't Fox use it? Changes to oil weight will affect the feel of the shock at all temperatures and the damping will still get lighter as it heats up. Basically, if you want a shock that is consistent on long descents you need a coilover with piggyback (lots of oil to absorb heat & lots of surface area to lose it).Īny changes you make to the pressure will only affect the progressiveness/overall spring rate. I think that you'd still feel the compression damping fade and the air spring get stiffer from heat. Rockshox's thermally sensitive, expanding rebound needle is a novel solution and my friend who's testing it says it works great on long DH runs. I think Push's staged rebound cures this some but it will still get faster when the shock heats up. I feel this on my Mojo but it's the price you pay to descend hard on a lightweight shock. Small oil volume surrounded by an insulating air can is the issue. Since heat/fading/oil thinning is the problem I don't see any solution.
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