Thanks for your reply.

I never noticed any "clunkyness" prior to taking the wheel out to get the tyre changed.

I go to see the local dealer tomorrow and will try the warranty angle and hopefully bring the old ones back and re-fit and wait for a few days until the new ones come. Can you believe it that I was told by dealer that Yamaha UK wont send out parts on a next day service and it takes 2/3 days! what happened to customer service- I sell spare parts and my customers would not put up with this type of attitude from Yamaha.

I will check the bearing also.

thanks.