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After more than seven hours of hard work though, I didn't have enough strength to pull the new tire on. Fortunately the maintenance wagon came by. He had no problem at all.
Yes, preglue the spare, and prestretch it too. I had stretched mine, but not enough apparently for a mile 106 tire change.
The Tri Shop.com
I usually just use an older tire for my spare. That way it has some residual glue and is stretched to fit the wheel. This strategy works well unless you've just gotten your first ever tubular wheels... then you have to wait until next season.
As far as pre-glued, I glue the tyre in the manner that I have described, and let it dry. I then use waxed paper (cut in thin strips) to protect the glue from road debris.
As far as a spare goes, buy a cheap tubular tyre (no problem if you're running 700c) or buy a couple more tyres. There are four things I keep extras of: bar tape,C)2 cartriges, tubes for clincher tyres, and tubular tyres. I always have atleast two race-usuable tyres that are prestretched and ready to go. This does not count the retired tyres that go onto the bike for training (as I am switching to tubulars for everything, as soon as I build a road rim- I have tubs on my fixed gear).
Andy Tetmeyer (I work at HED)
I have what is probably a stupid question for you. You glue a spare for a race\ride and don't use it. Even with wax paper, won't the glue dry after a while? Is it like rubber cement and easy to remove from the tire before reapplying?
Remember this- half of making sure the tyre sticks is air pressure. You could almost call tubular glue pessure-activated. Also, it really likes itself and sticks pretty well to itself. You would be amazed at how well it can stick. If the glue is crystallised, then it's time to brush off the old glue and reapply it. That's when you know that it has dried out.