So I went for a ~10mile ride this evening with the serviced air can.
OMG.
Servicing the rear air can is my new favourite thing I’ve done to this bike and that includes fitting a reverb and changing the avids to shimano brakes.
There is so much more mid range support- the bike no longer wallows in the mid travel area. It makes climbing an absolute breeze and doesn’t seem to have adversely affected descending performance- the shock is just as supple over bumps etc.
I’ve got a theory on why there is an improvement.. on the FOX air can there is a small negative spring chamber directly after the external wiper seal/quad ring assembly- over time dust, grit, water or even air will get into the negative spring area past the wiper seal. Anything getting in to this area will decrease the volume and hence increase the pressure of the negative spring- causing the shock to sit lower in it’s travel for a given ‘set’ air pressure. Hence the wallowing and general poor performance.
So if you have a FOX air can and it’s been on the bike 6months or so… definitely do a service on it.. you will not regret it!