I picked up an 08 Diamondback Response Sport which has an Octalink BB. I bought it in Feb and rode it probably twice on a decent butt kicking trail and about two dozen times on lengthy road rides. I noticed yesterday I heard a certain creak, which I'm almost positive is due to my pedals since the pedals I put on this bike were about 7 years old and didn't look to be in the best shape. But out of curiosity I lined up my crank with the bottom of the frame so they were both parallel. Then I used my hands to just use pressure by clamping them together to see if I could generate any "play" in the BB.
It moved... a very slight bit. Nothing earth shattering or "OMG GO ORDER ONE NOW!" but just barely enough to even notice. Thing is I never checked this before, so I don't have anything to compare on. It could have been like this since day one and very possibly it just may be completely normal, I don't know.
Pretty much every single place I've read stated that Octalink is stronger than square taper, but this of course is very dependent upon the actual parts you buy - a good ST could be better than a cheap Octalink, etc.
But for a stock Octalink BB on a Diamondback in the 400 dollar range, is it out of the question to consider it "may" be going bad now? Octalink owners - how long did your's last?
Any additional input?