Similar to the commuter bike, the city bike is more optimized for urban commuting.[2] Unlike the European city bike, it has mountain bike heritage, gearing, and strong yet lightweight frame construction.[2][5][6][7] It usually features mountain bike-sized (26-inch or 660-millimeter) wheels, a more upright seating position, and fairly wide 1.5–1.95-inch (38–50 mm) heavy belted tires designed to withstand road hazards commonly found in the city, such as broken glass.[2][8] Using a sturdy welded chromoly or aluminum frame derived from the mountain bike, the city bike is more capable at handling urban hazards such as deep potholes, drainage grates, and jumps off city curbs.[2][8] City bikes are designed to have reasonably quick, yet solid and predictable handling, and are normally fitted with full fenders for use in all weather conditions.[2] A few city bikes may have enclosed chainguards, others may have suspension forks, similar to mountain bikes. City bikes may also come with front and rear lighting systems for use at night or in bad weather