presently building a street chair and needed proper tires, for the bike. I bought a Metzeler  18" from Eastern Michigan Cycle who say they have 4 more. I would of course prefer to buy from a Canadian dealer but most have no idea what a square section tire is, let alone what it is for. I have a 350X16" Hidenau ? on the way through my local dealer but the first attempt brought a 500X16 not even shown on their website.

Using the 16" on the front to get the wheel back as far as poss. TX Yamaha has 3.9" pos trail. I hope with Earl's forks to bring that down to 1" or less, much more may start hitting the frame.  Paul.