I hear a faint rachety sound when I pedal forward...I had some grit in my chain that was making some noise so i cleaned it out really well and lubed it up. now my chain is clean but that faint rachety sound is still there when i pedal. Isnt the drivetrain supposed to be fairly silent while pedaling? Is this rachety sound just the chain hitting the cogs and is normal? I know its not the hub because I can spin the wheel backwards and its silent.