I have a Micargi Tahiti single speed and I fitted the rear sprocket to the tire before mounting it and it fit snug over the hub however when I put the rubber gaskets on and tightened the sprocket down the rubber gaskets wont squish enough and the sprocket wont set all the way around the hub. I put the dust cover back on after grinding it down a bit and the metal arm I(I dont know what its called) I guess its for the braking system wont lock down with the dust cover installed any suggestions??