The Sachs MadAss is an underbone

Underbone

An underbone is a small motorcycle built on a frame consisting mostly of one large diameter tubular component.The stylistic difference between a motorcycle and an underbone is considerable and they are sometimes known as "step-throughs" or even marketed as scooters in the West.The fuel tank...

 motorcycle

Motorcycle

A motorcycle is a single-track, two-wheeled motor vehicle. Motorcycles vary considerably depending on the task for which they are designed, such as long distance travel, navigating congested urban traffic, cruising, sport and racing, or off-road conditions.Motorcycles are one of the most...

  available in a 49 cc or 125 cc made by German automotive company Sachs Motorcycles

Sachs Motorcycles

Sachs Motorcycles is a German based motorcycle manufacturer, founded in 1886 in Schweinfurt as Schweinfurter Präzisions-Kugellagerwerke Fichtel & Sachs, formerly known as Fichtel & Sachs, Mannesmann Sachs and later just Sachs....

 since 2000. The engine is based on the popular horizontal one cylinder originally used in Honda

Honda

is a Japanese public multinational corporation primarily known as a manufacturer of automobiles and motorcycles.Honda has been the world's largest motorcycle manufacturer since 1959, as well as the world's largest manufacturer of internal combustion engines measured by volume, producing more than...

 mopeds and small motorcycles from the late 1960s.

It incorporates the fuel tank into the frame

Motorcycle frame

A motorcycle frame includes the head tube that holds the front fork and allows it to pivot. Some motorcycles include the engine as a load-bearing, stressed member. The rear suspension is an integral component in the design. Traditionally frames have been steel, but titanium, aluminium, magnesium,...

 and has no external bodywork or fairings

Motorcycle fairing

A motorcycle fairing is a shell placed over the frame of some motorcycles, especially racing motorcycles and sport bikes, with the primary purpose to reduce air drag. The secondary functions are the protection of the rider from airborne hazards and wind-induced hypothermia and of the engine...

. It has a stainless steel under-seat exhaust, a four-speed manual gearbox

Sequential manual transmission

A sequential manual transmission is a type of manual transmission used on motorcycles and high-performance cars for auto racing, where gears are selected in order, and direct access to specific gears is not possible....

 or automatic transmission and dual hydraulic disc brake. The front headlights are positioned vertically. In the US, the 49 cc model is limited to 40 mph (64.4 km/h) to qualify as a moped

Moped

Mopeds are a type of low-powered motorcycle designed to provide economical and relatively safe transport with minimal licensing requirements.Mopeds were once all equipped with bicycle-like pedals , but moped has been increasingly applied by governments to vehicles without pedals, based on their...

in some jurisdictions.

The MadAss has been sold in the US as the Xkeleton Trickster, and under the Pierspeed and Tomberlin brands as the MadAss. In Canada, it was also sold as the AMG Nitro.

Reference

• 2010 Sachs MadAss Review, Steve Guzman, 26 November 2009, Motorcycle.com
• Sachs MadAss 125 tested, July 08 2011, CMGonline.com