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 snow Standard 26x4.0 559 Wire Bk/Blk 20 1440 30 68a NoUPC/EAN/GTIN: 6927116172879