Help ! I have had to take my Brodie back to the store three times for this problem and it continues to reoccur.
Basically, I have two rings. In the 15th and 16th gear...they will suddenly start to grind.
It appears that the chain might be rubbing against the derailler or something. I don't know but when I am cycling and change into these gears, the chain will grind constantly until I shift down to a lower gear.
The bike shop basically told me that it is the gear cables stretching but I have had the bike 2 months now and why it only these two gears that are causing a problem.
Any suggestions ?