The local bike shop had trouble removing the old rear tyre, as it was so hard and dried out. They had to put a tyre warmer on it for awhile before they could safely lever it off. I'd told them to be extra careful, as the wheels are known to be easily damaged. Going to polish all the alloy adjusters etc before fitting the rear wheel, then repeat the process with the front. Its been so long, that I cant remember if the bike is stable on its centre stand with the front wheel removed..