My Giant Lafree is showing signs of age. The bike has done about 15 to 18 thousand miles over the last 6 years. Just took the bike in for a service as the chain is not running smoothly. I have been told that the front sprocket is showing a lot of wear. The bike shop is not sure what the part is, but will 'phone Giant tomorrow. Does anyone know whether Giant will be able to supply a replacement and if so, at what cost?