The Bontrager R4 Classics Tubular Road Tyre 700x 28c is a high-grip tubular tyre designed to conquer the classics, wet or dry. The cobbles of Paris-Roubaix are the inspiration for the R4 Classics tubular tyre. Combining confident traction & a fast rolling yet grippy tread, the tyre sets out to tame the most rugged roads. Hard-Case Lite with polyamide synthetic fibre reinforcement add puncture protection & durability to the super-supple & fast-rolling tread design. Features· Excels in cobbles & rough roads where traction & confidence matter most· A high grip tread & compound performs in wet & dry conditions· Super-supple polyamide synthetic fibre reinforcement for added casing strength· Hard-Case Lite protects against punctures with lightweight, sub-tread material· 38 mm valve length with valve extenders available separately