Schwalbe thunder burt evo mtb tyre raceguardthe tire development goal was to combine the best of racing ralph and furious fred at less than 400g the weight is almost exactly in the middle with its many small lugs thunder burt is close on the heels of racing ralph regarding grip and in terms of rolling resistance its even better than furious fred features size etrto 54 559 26 x 210 inch typefolding compoundpacestar executionraceguard tl ready skinlite pressure2 00 400 bar