I just had my bike in for its yearly check at GW Cycle and they showed me the rear sprocket and the front compared to a new one. It was bad. My Storm has 21000km and according to the mechanic it is recommended to change it at this mileage or lower to avoid further damage to the Bike. I also had Dunlop D220 Tires installed as my rear was burnt and my front had a flat. What a difference to the bike felt toltally new better handling and less noise. Clicking noice I was experiencing before was from the worn Sprockets and chain now sounds great and handles like a dream.
James