The best way to install a tyre and tube onto a clincher rim is with the 'back off' method.
- Install half the tyre.
- Slightly pump up the tube. It should be somewhere between a round shape and the flat deflated shape.
- Start at the valve, and install the valve by peeling back the tyre at the valve hole (over the already installed side).
- Pull the tyre carefully back over the tube.
- Push up on the valve to push in comfortably up into the tyre.
- Now put the rest of the tube into the tyre so that it loosely holds the shape of the wheel while sitting in the tyre.
- Now start at the valve hole. Push the tyre bead up and and over and onto the rim.
- Push up again on the valve now to make the tube fully sit under the tyre.
- Now push the tyre lightly down to push the bead under the rim near the valve hole.
- Push a little on each side, and the check to see that you can't see the tube near the valve hole when you try to push the tyre over.
- Extend out by 1/8th of the wheel either side.
- Ensure no tube should be seen at, or either side of the valve when you push the tyre back (the rim strip should become visible, but no tube should be visible.
- Ensure the valve is straight. If it isn't quite, give a pull on the tyre side that will move it across the tiny bit to get it straight. (You may have to do 3 seperate pulls, one at just past the valve, one about 1/3rd of the way around, and one 2/3rds of the way around.
- Now start on one side of the tyre, and push it on, making sure that each push on keeps the tube in the tyre.
- If at some point it doesn't quite sit under it (i.e. is still visible when you push the tyre over to reveal the rim strip), then pull the tyre back off a little with you hands, and keep doing it til you get to the other side.- Now 'back off' about 1/8th of the tyre with your hands.
- Start on the other side near the valve, pushing the tyre on. Ensure the tube goes in, and under the tyre, and when you push back to reveal the rim strip, no tube is seen.
- Wait til it starts to get a little hard to get the tyre on.
- Make sure all the tube is now fully on the rim, but also under the tyre.
- If you have a little tube showing, and it's starting to get hard, then 'back off' the other side again by about 1/16th of the wheel.
- The tube should now still be under the tyre, but also on the rim.- 'back off' about 1/8th of the tyre with your hands on this side now.
- Now, you should have all of the tube under the tyre, but also fully on the rim. This is the key to not pinching the tube during installation.
- It's now just a matter of pushing the rest of the tyre on the rim.
- If it's a really tight fit, use a reversed tyre lever or 2 to help. There is still a risk of pinching the tube, but just make sure your careful on lever insertion not to catch the tube. Michelin tyre levers are the best for this.
- Check both sides of the wheel for signs of the tyre being visible when you push the tyre over on the rim base.
If you have done this back off method right, you should never see the tube visible if you have used your hands to finish the tyre install.
If you have used tyre levers, and the tube is slightly visible, you can sometimes just give the tyre a few pushes across, and it will slowly roll up and under the tyre. If the tube doesn't get up and under the tyre, you have to pull half the tyre off, starting from 1/4 wheel from the valve (i.e. a part where there is definately no tube visible.
I tried finding a youtube video on this method, but lo and behold, I couldn't find one.
But once you have seen someone use this method you will wonder why everybody doesn't do it like this.