To use the PD - GR500 pedals, simply place your feet on them and adjust the height of the pins according to your preference. These pedals are great for both on - road and off - road cycling. When riding, make sure your feet are centered on the pedals for the best grip. As for maintenance, it's easy. Since the pedals have sealed bearings, they're protected from wetness and dirt. But it's still a good idea to clean them regularly with a mild soap and water to keep them in top shape. Avoid using harsh chemicals as they might damage the pedals. If you notice any unusual noises or looseness, it's a good time to check the bearings and make sure everything is tightened properly.