Wheelchair Tube 20" x 1-1/8" x 1-1/4" - Presta Valve

On my second pair, these last me 2 years if I use my chair daily. I exercise in GG Park and roll over gravel pavemenl, dirt, grass and at times broken glass and have not had a flat yet. Worth the $s. I use basic Primo Vtracks and the treads are already gone in a few months and these are used indoors. So next time I'm using Evolution's indoors and should last at least 5 years before needing changing since outdoors the Evolution's lasts me 2 years.