This is a tubular tire ("sew-up") Tubular tires are compatible with tubular rims and are installed with glue or a special adhesive tape. Tubular tires will not work on clincher rims (the standard rim type). TECHNICAL EQUIPMENT: K-GUARD Protection layer reinforced with Kevlar® fibres. The protection standard for every tire from the Active Line. HANDMADE TUBULAR Hand making a tubular tire is an art in itself. So, because production differs distinctly from the manufacture of regular bicycle tires, they are exclusively manufactured in a new Schwalbe factory. For each, individual "hand made tubular" a lot of careful craftsmanship is required, so only the most skilled people are employed to construct each tire and, by hand, stitch and glue together each part. ACTIVE LINE The basis for all Active Line tires is the high-quality 50 EPI carcass. SCHWALBE no longer produces tires with a coarse 20 or 24 EPI carcass. In addition, K-Guard provides effective puncture protection for Active Line tires.