I needed new tires on my TU250. Being that it uses skinny, 18" retro sizes, the pickings are a bit slim, so I decided to take a chance on the Shinko 712 which seemed pretty highly regarded over on TU250riders.net. It helps that there were about $60/tire. This results in a 100/90/18 on the front instead of the stock 90/90/18 on the front, but the new tire fit without rubbing on anything, and supposedly corrects the cable-driven speedometer error with the slightly taller profile. I had a good local shop I give lots of business to order, mount and balance the tires for me. I brought them the wheels off the bike, and then carefully re-installed the wheels myself, as I have done for many years. I had my maiden ride on the new tires yesterday, and I'm getting a terrible bouncing from what seems to be mostly the front, basically everywhere between 35-60 mph -- IE pretty much the entire ride on backroads. It feels like I'm driving over low-frequency rippled pavement, and if I look down at the front wheel, I swear I can see the forks bouncing up and down. When I kind of stand on the pegs and look down at the front tire, the left side of it seems to be spinning pretty true, but then I look over at the right side, the edge of the sidewall (a nice reference to watch while it spins) appears to be non-concentric as it rotates, moving very obviously up and down in a frequency that seems to match my bouncing. Does this sound like I got a bad tire that isn't round? I mean, Shinkos are cheap, but this seems pretty egregious. When I got home I carefully inspected the bead area and the tire seems to be installed correctly, and I'm completely positive I mounted the wheels on the bike properly. I did notice that the shop had to use two big strips of balancing weights on both sides of the front wheel in the same spot. For a tire like the 712, is it even worth trying to see if there is anything that can be done, or should I chalk this whole thing to an expensive learning experience and get a better quality tire on the front and be done with it? Pretty disappointed...I've never had a problem with a new tire like this before. The rear tire didn't seem to do anything weird. On googling, I'm finding pretty varied reports of people have similar problems with the FRONT 712....poor QC?