Panaracer GravelKing X1 Plus Tire - 700 x 40 Tubeless Folding BlackZSG GRAVEL compound Featuring a specialized gravel specific compound crafted from our proprietary ZSG material. ZSG ensures remarkable resistance to temperature and weather fluctuations, ensuring consistent rubber performance across a spectrum from near freezing to scorching temperatures. performs lower Rolling Resistance and Grip for bothGravel and Tarmac. TuffTex + Increases resilience with a dual layer of bead to bead TuffTex material, providing