Inside bead over the inside rim

From SegwaySocial

Position the Tire in the Dropwell

To mount the inside bead, begin by lubricating the tire bead and rim with soapy water applied with a small brush or a rag. This will help ease the bead over the rim in the next few steps.

Now pinch the tire's sidewalls and push as much of the tire as you can into the dropwell (opposite the valve stem again). Note that both sidewalls are inserted into the dropwell. You should be able to get about half of the tire's the circumference below the rim with just your hands. As you proceed with the steps below, take care to not allow the tire to slip out of the dropwell.

Use the Tire Levers

Next, push two tire levers between the tire bead and the wheel as shown so that the hooks on the levers engage the wheel rim. One of these levers will be used to do the work, while the other is left stationary to keep the tire bead from moving above the rim. Until you are practiced at this procedure, you may find it helpful to have an assistant hold the stationary tire lever for you so that it isn't pushed out of position as you complete the next few steps.

With the tire levers in the position shown, pivot one of them on the wheel rim and pull a small section of tire bead over the rim (see the yellow arrow in the photo). Remove the tire lever and reinsert it a couple of inches away and pull another small section over the rim. In this step, you are not stretching the tire over the rim (it won't stretch), you are actually pulling the adjacent tire bead deeper into the dropwell. It does not take very much force to lever a small section of bead over the rim. If you can't easily pull a section of bead over the rim, hold some tension on the lever and work more of the opposite tire bead back into the dropwell.

Continue repositioning the lever to pull successive sections of tire over the rim a few inches at a time. The next photo shows what the tire will look like when you are almost done mounting.