Is it ok to just change the front tyres to something decent and leave the rears alone?
Now that's another debate
Costco or at least Michelin will only put the new tyres on the rear. Loads of articles to back up its safer to do it this way but it doesn't seem quite right when you are steering and pulling from the front!!
Anyway I got 2 Michelins from Costco to replace the Bridgestones on my GTD. They obviously put the old Bridgestones from the rear to the front and normally i would swap them back when I got home but decided to leave them to wear down the front Bridgestones quicker. I used to think they were okay but in any greasy condition they just slide about. Getting the stability light flashing at 40 when you are getting on can be quite scary