To supplement the advice from Gromit, here's a short video about replacing the chain and sprockets on the CBR300:
The OEM front sprocket is 14 teeth
The OEM rear sprocket is 36 teeth
When the chain has the proper tension and the rear wheel is correctly positioned in the swing-arm, there wont be any rub.
My guess is the rear axle didnt get the full/proper torque, and the chain tension pulled it a little sideways. This would make your chain appear loose and will also cause accelerated wear on the tire. If i'm right, all you have to do is make sure the left and right halves of the swing arm align with the same adjustment markings.
well I have the chain tightened and the axle nut it torqued to 65ftbls and it aligned in the right spot but I’mreally thinking it is that the tire is to big in the back the guy put 160/60 mc17 I believe on the back and the chain with it tightened the right way I’m able the push the chain in to the tire even if I tightened the Chain tight it still able to push the chain and it touch the tire so I’m thinking I’m going to changethe tire it the back to a 140/70 mc17 that came on it stock and go ahead and put new sprockets and chain on it but I’m having trouble finding a good chain I found the front and back sprockets but I’m not sure what chain to buy that’s a good chain any ideas?
