TIRE ARISUN BIG SMOOTHY 26x4.0 BK WIRE/30Features-Inverted continuous center tread is formed by dimpled diamond design with narrow grooves between blocks to decrease rolling resistance and provide a smooth ride over hard surfaces-Diamond pattern becomes progressively larger and more aggressive as it approaches the sidewall-Larger side knobs produce better grip and traction when riding thru gravel, dirt, and snowItem Specifications-Size:26x4.0-Weight:1440-PSI:20-TPI:30-Tire Bead:Wire-Tread/SW:Bk/Blk-Durometer:68a-Style:Standard-Reflective Sidewall:No-ISO:559