Schwalbe winter spike road tyre k guardwith half the amount of spikes the winter spike road tyre provides excellent control on glassy ice only in extreme cornering is its big brother the marathon winter superior with a 50 epi carcass reflective lines and k guard protection it offers great benefits at an entry level price features bead wire compound winter execution k guard spikes 118 skin twin pressure 350 650 bar 50 95psi maximum load 75kg epi 50 weight 805g 28oz tec