Scooter (motorcycle) There have been scooters with fixed engines and chain drive, and there have been underbones with swingarm-mounted engines. A twenty-first century example of variance from the typical scooter layout is the Suzuki Choinori, which had both its engine and its rear axle rigidly bolted to its frame. Motor scooters are popular in most parts of the first world, Europe (particularly Italy and the Mediterranean), Japan and Taiwan, but not the US. They are even more popular in most parts of the developing world, particularly in countries such as India, Indonesia, Thailand, Vietnam, and China where there is local manufacture. Parking,
Scooter (motorcycle) chain clean and reduce wear. The final drive of a scooter with a swingarm-mounted engine runs in a sealed oil bath and is shorter. An underbone is usually fitted with near full-size motorcycle wheels, which are often spoked. Scooter wheels are usually small, and made from pressed steel. In both cases, more recent examples often have cast alloy wheels. The bigger wheels of an underbone allow more ventilation and better cooling for the brakes than the smaller wheels of a scooter. While the engine and suspension layouts described here for scooters and underbones are typical, they are not rigid definitions.