The front tyre on the Guzzi has worn in an odd way. It has a sawtooth pattern on the tread pattern after 5500 miles (with about 1.5mm left) Quite pronounced to the touch but not as obvious as I'd hoped in this picture: [URL]http://www.sweller.dynalias.org/images/tyre.jpg[/URL] It's done this since I fitted the more modern air assisted forks with not so saggy springs. They're still very primitive in the amounts of adjustment available but what's the sawtooth wear pattern a symptom of?