Using the Pedal Spike 20 is easy. First, adjust the seat height so your feet can touch the ground comfortably. When you want to change gears, use the grip shifter to select the right one for your speed and terrain. To stop, gently squeeze the brake levers. Remember, when riding, always wear a helmet for safety. Also, avoid riding on very rough or wet roads to prevent accidents. For maintenance, regularly check the brakes to make sure they're working well. Keep the chain clean and lubricated for smooth gear changes. If you notice any loose parts, tighten them up or take the bike to a professional for a check - up.