I know I shouldn't have my chain angles like this for real use, but I cleaned my chain, cassette, and front cogs last night (had to take rear wheel off). So when I got it cleaned and put the wheel back on I ran through all of the gears jsut to make sure I had every thing back together right. When I had the chain on the second cog in the front and the 8th in the back the chain just barel rubs against the front derailer so that I hear a sort of clicking sound. Is this something that I caused by not putting the rear wheel on correctly, or is this nothing to worry about because I shouldn't have my chain angled like that anyway? I'm not sure if it was like that before because I never really use that gear combination. Thanks.