Easy to replace! Watch the video and after one, you’ll be able to swap them quickly. I built another set of wheels to have ready but plan to build more for variety. Once you get the tube inside the tire, put just a little air in it for shape (not a lot) before sandwiching it with the split hubs. Squeeze the hubs together until you feel them connect solidly (without pinching tube) as you tighten hardware. Luckily, I was in front of my house when I blew my last flat but I always bring a spare when going a distance. Bungy it to your board with tool in pocket or throw them in a backpack. Good stuff.. love this board!