Excellent value priced right. Panaracer offers a ZSG Natural Compound for long lasting wear and a comfortable ride. Catalyst is the best balance between a high-end racing tire and a training tire offering superb durability, comfort, and confidence. - Road racing tread - Max fill 8.3 BAR or 120 PSI - Wire (steel) bead = 30 TPI - Folding bead = 60 TPI