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I replaced a set when I rebuilt the set of sport wheels I have on my GT because I wanted to powdercoat the hubs. It's a total pain in the ass. Let me refraise that, TOTAL PAIN IN THE ASS. :D

There is no way to access them from behind, so short of trying to cut out the rubber with a hole saw and then grinding through each sleeve with a dremel tool, then prying them out, what I did was find a metal rod that just fit in the center sleeve. Then I packed the cush drive/hub full of grease, put the rod in and pounded them out with a sledge hammer. Repacking more grease as neccesary. I had to heat the hub on most of them, but usually they would start to slowly moveo out with the first couple hits, about 1/32" at a time. Hit, hit, pack, hit hit, pack.....took forever, but they all came out clean.

That said....my stock GT cush drives had a buch of play in them right from the start, with probably only about 2000 miles on them. Before I changed wheels what I woudl do is cut little square pieces of aluminum from a beer can and curve them to fit on the non drive side of the sprocket carrier pegs to take up the slack. Worked great.

I'm not sure how many miles, wheelies, drag races, etc. it would take to actually wear out the cush drives, but I saw no wear on them in either set of wheels (over 38,000 miles on my bike now). They just fit loose. Also, the sprocket carrier pegs get worn, so maybe check that.
 
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