Panaracer - RegaCross (Cyclo Cross) Tubeless Folding Bicycle TirePanaracers unique outer seal tubeless structure reduces the chance of punctures even at low pressures. The outer seal method also reduces the chance of sidewall damage to our proprietary inner construction. Specifically constructed long vertical knobs and a low profile design provide optimal transfer of muck while maintaining the ideal balance of rolling resistance and grip. Specially crafted ZSG Natural compound is used to match the rigors and