So I have had an ISX 6 sitting around for the past couple of months as it was a take off from my Nomad. It worked brilliantly on the Nomad and I spec'd the FB with the RP23 with the thought that if that shock wasn't to my liking that I would replace it with the ISX to see how that worked on the bike. I finally got around to ordering the hardware kit from Manitou to put the shock on to the bird. Thanks to Ken for filling me in on the hardware sizing. It turns out that the standard 8X22 mm is a perfect fit. I was little worried as Pivot specs that space as 0.86" which isn't quite 22 mm.
I haven't had a chance to get out a ride it yet....but I was running with 230 lbs of air in the RP23 and was having a difficult time finding an air pressure setting that really seem to work well as 5 psi seemed to make a significant difference in ride height and how many pedal strikes that I collected on any given ride.
I plan to take the FB to Moab and Fruita next week so if the test rides all go well I'll have a chance to really put the shock to the test.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Manitou Evolver ISX6 on the FB