I was gonna say I'll let you know, getting one installed as we speak. The guy at the bike shop says he's done a couple & it "livens" them up quite a bit. I just have the other Big 3 besides the cam, no 15T. IMO i'd say the 15T would hurt you more on tight triails, I didn't like it on the trails, found myself doing the 2 to 3 shift a lot.
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