• (Jump to the video below if you prefer) First and most importantly, make sure you are following best practice tire install procedure: Get one bead fully seated and sitting in the deepest part of the rim well before moving onto the next bead. With the next bead, you want to start from the end opposite to the valve and work your way around towards the valve. Along the way, ensure that the tire beads are sitting in the deepest part of the rim well - this is really important as it creates a looser fit for the bead sections not yet seated. The last section to seat should be right at the valve. Because the valve head prevents the bead from sitting deep in the rim well, finishing the seating process at the valve is important for tough fitting tires.
• Enduro/DH casing tires, will likely require the use of tire levers to get the final section of tire bead over the rim. It's important to use a robust lever and also to avoid a greater than 45 deg angle of the tire lever to prevent damage to rim tape.
• Radial casing tires can be a bit trickier to install because the ply bias tends to want to keep the tire beads open and spread appart. 

Tips and Tricks

• Pick a good work surface for the install. A big round garbage can at about waist height is a great surface to install the tire on. 
• Using some bead lube or window cleaner on the tire beads can make pushing them over the bead hook much easier. 
• Putting the tire in the sun or a warm car for a bit in advance of install will help soften the casing up and make the tire less stiff which makes the install process easier. 

Sources of Potential Problems

• Rim Tape: Rim tape and number of wraps can play a big role in tire fit due to the fact that it builds up the OD of the rim well. Tapes such as Gorilla Tape can be very thick and make the install process much more difficult. e*thirteen tape is very thin and we recommend 2 full wraps around the rim. We spec a double layer of adhesive which easily compresses aiding tire install. Make sure you are using tubeless specific tape with the correct number of wraps specified by the manufacture and that it is fully seated in the rim well with no creases or crumples. 
• Rims and Rim Design: Controlling tire bead sizing is much easier than controlling rim sizing. Oversized rims, rims that use non-ETRTO dimensions, or rims that use thick plastic tubeless strips can all make installing tires more difficult. 

How to Correctly Install a Tire: