these are really a GREAT option for kids or the non-professional rider in areas that cause lots of flats, like in my giant sticker infested country area. I've used these on a ten speed for myself, and love them because they last.... for YEARS. It makes the bike heavier, but after a while ya don't notice, it just strengthens the legs even more. If you are racing or going cross-country or mountain biking with lots of jumps, these are not for you!!! But, for my son's 20'' and my 27'' they have been great.
On my son's though, I think I could have went with an 18'' and it fit his rim better as well as 20'' tire since it is already as full as it's going to get (no air) the rim had a couple inches of room, where it wasn't something I could make fit tight like with air without the tire around it... plus the tire being only 20'' trying to get all that on the rim (FOLLOW DIRECTIONS!!!! SAVE FACE!!!) it was a Major ordeal--like changing tubes always is only a hundred times worse. When I do another tire I'll compensate the size for the lack of flexibility of an un-aired up tube, it still will fit the rim.
Downfall... besides effort in putting on is PRICE. I could replace my son's tire about 5 times with a normal tube and pay the same price for 1 of these. After the issues with getting the thing on and realizing my son's tire is also need of replacement... and also that he will probably want a larger bike and be ready for one soon... It wasn't really worth the money. But, if it's a bike or other device that uses this type of tubing and would be on long-term use (at least two years or so to make it worth it!!) it is totally the way to go. I had these in my 10speed for over a decade. Still good.
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