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There are actually 3 generations of the RC4, at least the way we break it
down. The first gen (5/8″ shaft and Boost Valve) which had some issues with
the forged eyelet cracking around the HSC/LSC adjusters, the second gen (same
thing but fixed that breakage issue), then the third gen which had the 1/2″
shaft. The 1/2″ shaft variant was a bit of a hackjob to be honest - it had
better rebound control but the oversize reservoir which was necessary for the
5/8″ shaft became redundant, you lost the ability to control ending stroke
ramp up (the "air assist" thing didn't do a whole lot - it was just left there
so they didn't have to change any parts) and they went back to the 1/2″ shafts
which occasionally cracked at the eyelet threads. This was basically Fox
copying what backyard mechanics had been doing using DHX parts (the shaft
assembly and seal head) and removing the boost valve. The 2nd gen ones were
the most bulletproof and a great performing shock, but a bit confusing to set
up. The 3rd gen ones were a little easier to set up because they weren't very
sensitive to air pressure and the air assist thing was pretty useless, so it
cut the number of actual adjustments down a bit.
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