K-Shield. The protective layer is applied between the casing and the tread. K-Shield is made from ceramic particles and aramid fibers. Fewer punctures reduce repair times and extend your enjoyment of riding. Additionally, K-Shield decreases rolling resistance. Wheel size: 28 inches. E-bike compatibility: Manufacturer recommendation up to 25 km/h. Delivery includes: single unit. Intended use: City & Trekking. Details: - Comfortable rolling due to wide central rib and grip from side lugs - Comfortable premium trekking tire - Usable for both front and rear wheels. Tire construction type: Wire bead. Version: K-Shield.