The schwalbe smart sam plus mtb tyre uses double defense greenguard protection this is a combination of puncture protection with a 3 mm layer of greenguard under the tread and snakeskin on the sidewalls the image above shows the cross section of a greenguard protected tyre the schwalbe smart sam plus mtb tyre comes ebike ready certain faster ebikes up to 50 kmh require specialist tyres and the schwalbe smart sam plus mtb tyre is one of them valid throughout europe the schwalbe sma