Insane Bicycle Mechanic
Join Date: Mar 2008
Location: other Vancouver
Mentioned: 1 Post(s)
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It's the tire that maintains the shape- the tube just seals in the air.
Put only a little bit of air in the tube, not so much that it starts to stretch out. Place it in the tire, mount the tire on the rim. Be careful not to pinch the tube between the rim and tire. Once both beads of the tire on the rim, inflate it to about 15psi. Check all the way around the wheel to check that the tire is mounted evenly on the rim- there's a line molded into the tire that should sit on top of the rim. If it's not even, deflate, pull out any low spots, check to see that the tube isn't caught under high spots, and start pumping it up again. Check again when you get to 30psi- then 60 psi.
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