I bought a new zoomer elite with the 26in wheel upgrade. Over the last 2 months I've been having problems with tubes popping on me. They were blowing out through the rim liners at the spoke holes. I found that velocity makes plugs to fill the holes. Hostelshoppe sells them. So I got some on the way. I hope this fixes the problem. 10 years of riding, and this is a first for me!