You have to buy these both. I happened to buy them both on sale, and it was $55 total. The local outlet even had had them in stock. Even if you buy them at full price ($90) its a steal. Comes with a bead breaker - It's part of the base tire changer (item 34542). The only thing you'll need is some rubber coating to protect your rims (or some duct tape).
Use soapy water. If you use something that will really lube your rubber like grease or WD-40, you might risk spinning the tire on the rim once you start riding. I use about 20:1 soap to water (that's 20 parts water) No offense bwinger, it's no more corrosive than what you wash your bike with.
I too race, and I've changed up to 5 sets of tires in one day just for myself. Rains, to slicks, to practice rains, to race rains, etc. Only once did I have a problem setting the bead. I used a ratcheting tie down and wrapped it around the center of the tread to push the tire out.
I can change both tires with balancing in 25 min.
I've watched the AMA superbike and MotoGP guys balance tires the same way I do it on my home made wheel stand. If it's good enough for them, it's good enough for me.
-KM
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