I own a roadie w 700x25 tires, and a mountain bike on which I periodically change tire sizes. The roadie tires are a cinch - a gentle swipe with just one of these will do fine. But if your considering these for a mtn. bike bike tire size above 2.1", you probably want to get something more substantial. I had no problem getting 1.9" tires off the rim when needed, can just about manage on the 2.1", but these are absolutely hopeless on the 2.3" Kendas - can't get more than one lever secured. I am going to try some quality metal levers to see if that does the trick.