Using your Schwalbe Marathon Plus 700 x 28 tyre is straightforward. Just install it on your bike following the standard tyre - fitting process. For E - bikes, make sure to use the sizes that are approved for speeds up to 50 km/h. When it comes to air pressure, don't go too low as it can cause the sidewall to crack over time. To keep your tyre in good shape, check the air pressure regularly, about once a week. Also, look out for any signs of wear and tear. If you notice significant damage, it's time to replace the tyre. You can clean the tyre with a mild soap and water to remove dirt and debris. This will help maintain its performance and appearance.