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Proper Method of Tire Mounting
This animation details the problem of mounting a tire, with inner tube, on a drop center rim. Probably the most important details is to have the correct abount of air in the tube at the start and to get the tube centered in the channel of the rim as shown in the cross section.
The tube cross section diameter should be about half of the cross section diameter of the tire. If the tube loses its air prior to getting the left tire bead seated in the rim the flaccid tube is apt to get pinched between the tire bead and the rim bead. This will lead to a blowout and the process musr then be repeated.
The most interesting result that this animation provides is the needed stretch factor for the tire bead while getting it over the rim.
This is surprisingly small (about 1-2%) even for fairly large Initial Unseated Tire Angles which is a learner variable.
But for very stiff tire beads (like Kevlar or wire) this stretch factor can be challenging.