The Michelin Powershift tyre is the replacement for the Michelin Pilot Road 3 and 4. I'm going to get them fitted to my Tmax next week to replace the Pilot Road 4s I currently have. I have noticed that the front PR4 tyre seems to have developed 'corners' as it has worn down. Very strange.

I also experienced the same problems with Bridgestones a few years ago, as did a friend on his Burgman 650.

Chocky, thanks for that, didn't know what the replacements were. I've been reading about them on the Michelin site they get a lot of complaints about vibrations so I'd be interested to see how you get on.
I've also been reading Michael Neeves review of the Battlax SC2 tyres he fitted to his Tmax and he gives them a very good write up, they are bloody exspensive though.