Write them on my mountain board that I have corrected. The tubes it came with (I bought it used) were cracked and despite my best efforts to patch them they kept leaking so I ended up going ahead and buying new tubes. They got here very quickly and all I had to do was unroll them, put them on and pump them up. The metal value is very strong and I doubted I would actually make it all the way. Much easier than trying to fix it and so far it's working great and I'm glad I bought a new one. I don't think I'm hardcore enough to bang them but for now they fit perfectly.