bottle (sidewall) dynamo, and without the unreliability, high cost, ecological disposal problem, and maintenance inherent with batteries. The hub dynamo powers LED or halogen front and rear lights. The lights have a built-in reflector. The taillight is mounted cleanly on the rear rack or fender. A built-in reflector in the headlight and taillight surrounds or is adjacent to the LED or light bulb. Built-in lights stay on point, i.e., need no adjustments. The latest systems include a capacitor-powered standlight, powered for a few minutes by a capacitor. This prevents the lights from going out as soon as the bike speed drops to less than a few miles per hour; this evens out the amount of light at various speeds, sustaining the light at lower speeds. The latest systems include automatic switching based on darkness+motion detection. This prevents having to reach to physically position a bottle dynamo or consume set-up time; this enables ready, guaranteed lighting regardless of the daylight conditions. A three-position switch has positions for Off, On, and Auto. A hub dynamo prevents the usage-overhead and preparation time of attaching the headlight and taillight to the bike prior to using the bike, and prevents having to remove the headlight and taillight and carry them while the bicycle is parked in public. A built-in light system avoids a failing battery lamp and prevents getting a ticket and fine from having no lights at night. Many Danish bikes feature lights powered through electromagnetic induction. The lights are mounted on the bike wheels, eliminating the need for batteries while incurring less resistance to the rider than traditional dynamos. Front suspension with built-in headlight A front suspension fork is common on high-end, contemporary-styled European city bikes. This is often a coil/oil or air/oil suspension fork with adjustable compression and rebound. A traditional roadster has no front suspension, or a spring-based front suspension that has more limited travel and adjustability. Some high-end models integrate the headlight into the front fork and fender assembly. This discourages vandalism, protects the wiring, and reduces the number of external wires and cables. O-lock A built-in O-lock is a type of bicycle lock that prevents ride-off theft, establishes ownership, secures the back wheel to the frame (which can be separately locked), and provides a lock and slot for a cable. An O-lock is also called a ring lock or wheel lock. The O-lock facilitates outdoor parking, by reducing the