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Wheel & Rim Safety Manual
Handling tubes and flaps
Demounting
1. Before working the tire off the rim, make certain that the valve will clear the gutter section.
2. Remove flap from the tire, using a tool with a rounded end to pry it out and away from the beads.
On some types of tires, it may be necessary to use a tire spreader or a small auto jack to spread the
beads and assist in removing the flap.
3. Remove the tube in a similar manner, being careful not to pull on the valve stem or to damage the tube.
Mounting
1. Before replacing the tube, inspect the tire casing carefully, inside and out, for breaks, bruises, nails, etc.
Remove all dirt and foreign matter from inside the tire casing.
2. Replace the tube in the tire casing, starting at the bottom and working around the tire. Adding air as the
tube is being worked in will help hold it in place and reduce the possibility of wrinkles.
3. Insert flap in the tire casing, making sure it is properly centered and free from wrinkles. Rotate the tire
as the flap is worked in so the part being inserted is at the bottom of the tire. A dry lubricant, such as
soapstone, may be used to lubricate the flap and tube. In some cases, it may be necessary to spread
the beads, using a spreader or car jack. Lubricate beads with appropriate rubber lubricant.
