I looked around a bit and didn't find anything helpful. I replaced my sprockets and chain and now I have a vibration around 40-45 mph. Turns out the chain I bought is a POS according to some comments on some other forums. I got it because it was black and an o-ring type for a good price. I know; you get what you pay for. When I installed the chain the rivet style master link gave me some issues and didn't set all that easily. I'm concerned the master may have been damaged somehow and this is possibly the cause of the vibration. Everything else checks out; CS sprocket is seated and the nut is tight; the rear sprocket is seated on the hub and the bolts are tight, axle is aligned and chain is rolling straight. No vibration prior to the new driveline pieces and I haven't changed anything else. Anyone ever run into anything similar? I've ordered a DID chain as I should have in the first place. Any help is appreciated.