Sort of an old post, but I have a few things to add.
I picked up a 560x18-10 for my Kx5 today. Mine has an 87 swingarm on it, with the older style adjusters. As stated before, it's much larger than the 530x18-8. I knew as soon as I compared the two it wasn't going to be a direct fit. It went onto the rim easily, had no problems getting the tube or rim lock in. I also got a longer chain, the 114 link was not going to be long enough (I'm, running a 12t front sprocket already). To get the tire to not hit the swingarm, I had to run it almost all the way back (line 5 of 6). Even with it on the 5th mark it was still close to the gusset on the front right corner. The problem with leaving it there was the chain was not even close to being tight. To get it in the propper tension, I had to pull the wheel all the way back. The chain was just tight enough then. I could have let it be like that but didn't. Figuring the chain will strech some the first ride (and the axle at the end of the adjustment), I took out a link. This put the tire back into the front corner once the chain was adjusted correctly. My fix was to clearance the corner of the paddles with a grinder. Probably not the best solution, but I think it will be fine (I've heard the Cr500 guys have to do this to run a paddle). I've got close to 1/8" clearance now, hopefuly it will be enough. But I'm guessing the tire will grow at speed. I ran the bike in the backyard and didn't have any trouble, but couldn't get out of second gear. Maybe I will get it out into a field to do a better test.
On the plus side, this thing hooks up better than the new 756 I took off. The ground is real moist right now and this tire digs right in. I'm going to SilverLake next weekend and will report back with my results.
