New part in the Yamaha TT600R winter overhaul story. OK, so I got the rear wheel sorted and the tyres off both wheels. Mounting the rear tyre (that was a bitch to get of) was easy. The front tyre (that more or less jumped off the rim voluntarily) will not seat properly. This is a 90/90-21" tyre with a tube on a takasago spoke rim. I get it on the rim and one side plus 3/4 of the other seats perfectly. I have emptied and filled the tube a number of times, I have used a lot of tyre mounting "soap", I have tried with the tyre rotated to different positions on the rim. I tried bouncing the wheel on the floor and banging on the tyre with a mallet. It is not always the same part of the tyre or rim that is involved in the problem. How much pressure can I use safely, the tyre makers web site says 45 psig but I've already been at 60? Can I just go riding and hope some miles on rough roads will cause the tyre to seat correctly? What am I missing here?