I've got some spare Specialized "Airlock" inner tubes that are size 26x1.5/2.2. That means 26 inch rims, but what does the 1.5/2.2 mean? It fits 1.5 to 2.2 width tires or something else? Curious what this kind of size specification means.
Secondly, will it be advisable to use it on my bike that has 26x2.1 tires?