Join Date: Feb 2007
Location: Tariffville, CT
Bikes: Tsunami Bikes
Mentioned: 12 Post(s)
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Quoted: 139 Post(s)
Cut up a piece of thin cardboard (like a tube box), put it in there, one layer, and you're good to go. If you make it too thick (2 layers) it'll thump a bit due to the tire not stretching as much. If you use a dollar bill, tire usually stretches a bit too much (and thumps).
For a good trainer tire, go to a shop and ask for the cheapest steel bead tire your size. They probably have some left over thing for $10 and it'll be good for a few years of trainer riding.
Right now I use my (new) Michelin Krylions, which, after about 15 hours of riding on a CycleOps fluid trainer, still have the flashing up the middle of the tread. I am using them simply because they're on the wheels that are on the bike. I also use Schwable Blizzards (steel bead tire per my suggestion above, I've trained on the rear tire for about 3 years of winters and trainers), Conti/Vittoria tubulars, and whatever tire happens to be on the wheel.