Wide alternating rectangular knobs with deep channels between them offer a fast rolling, robust tire suitable for pavement and off roadInterior lug siping improves traction and water evacuating characteristicsE50 - are rated for use with E-Bikes up to 50kph (31mph) and conform to EU ECE-R75 standard. Also are designed for more demanding terrains and off-road adventuresStandard20x4.0406WireBk/Blk3060E50No