The Roadtec Z8 Interact™ also incorporates three tensions zones to provide best in-segment mileage and optimal wet performance throughout the tire’s life thanks to an innovative tread pattern, a widened and more elliptical footprint, and a host of wear-resistant technologies not normally seen in motorcycle tires. Metzeler’s patented tread pattern reduces front tire land-sea ratio to 11% and the rear tire land-sea ratio to 13%. Strategically placed longitudinal central grooves provide ideal drainage for more than 3/4 of all lean angles in the wet. The remaining tread grooves work to add tread flexibility, extending the footprint for stability in the dry. Everything about the new Roadtec Z8 Interact™ has been designed to put the rider in control; it responds like an extension of the rider’s instincts, creating an invigorating blend of precise riding feel and effortless handling. The updated design of the Roadtec Z8 Interact™ improves wear regularity, which gives riders the benefit of a consistent riding performance across the tire’s entire life. High-silica compound with nano-particles increases performance and safety in all weather conditions. O-spec rears feature 2-ply carcass for heavy sport touring bikes. A final footprint area 8% wider as compared to its predecessor. O-spec replacement for BMW K1600GT and K1600GTL. Tubeless (TL). Blackwall.