Looking at the rear wheel got me thinking about a flat? Many years ago, when I lived in the UK, I used ultra-seal in the tires and it did work. I can't find it for sale here in Poland, but a friend has found a type of slime that will do the same (to be put in before you get a flat). I used Ultra-Seal on a BMW LT 1200 and it gave a very slight wobble at around 5 - 8 mph but nothing after that, and as I was riding from Newcastle, England to the center of France and had to catch a ferry, a flat was not a good idea, and it did work then. I hope to ride the Spyder from Poland through Germany and into France this year, and a flat on the front would not be good, but worse on the back, where it could cause problems, so I will fit the slime before I go. If anyone has used this on a Spyder I would love to get your thoughts on how it worked out. Thanks (Jock).