Put the rim on something firm and clean , a piece of plywood or rubber on the concrete is good . Look at the rim and determine where the "well" in the rim is . The "well" is the deep groove that runs around the rim close to the centre on a safety rim . Make sure the "well" faces up , closest to yourself when laying on the ground . Put some liquid soap and water around the tyre bead and the rim lip . Lay one side of the first tyre bead over the rim lip and make sure the bead sits in the "well" . This will give you a little slack so you can pry the rest of the bead onto the rim . Have your irons at about 10-2 o'clock and take each one a little at a time . For example the iron at 10 o'clock will hold the bead from lifting while you lever the 2 o'clock iron and so forth . Once the first tyre bead is on , you then install the tube , taking note of which side of centre the valve is on and line it up with the rim hole accordingly . Now you must get the other bead on which is the same as the first with the exception of making sure you do'nt pinch the tube with the irons . You must also stand on the sidewall on the side that your starting on to ensure the second bead is in the "well" as you did before to give you some slack . Now that it's on , put about 10psi of air in it and then deflate it again , this step removes any creases that are in the tube . Use a clip on valve chuck and inflate to the correct pressure . Using a clip on chuck is very important as if the tyre comes off the bead while you are holding a push on type you can loose your arm or worse .