Monkey is a 125cc bundle of practical urban transport.

The Honda Z series or Monkey Bike was a line of minibikes made by Honda which have a model number starting with the letter Z. The bike came to be known as a monkey bike because most people looked large in relation to the very small motorcycle: onlookers described riders as looking like a monkey on the diminutive minibike.

Monkey bike is the name given by Honda to one of their small, low-powered motorcycles introduced in the 1960s. The first Honda Monkey was the 1961 Z100. Later Monkeys were designated Z50, such as the Z50A(US), J, M, R(US) and Z.

These vehicles all had a 4.5-horsepower (3.4 kW), 49-cubic-centimetre (3.0 cu in), single horizontal cylinder, four-stroke engine, and a seat height less than 22 in (560 mm). The first Monkey bikes did not have any suspension, but front suspension was soon added. By 1974, when the Z50J was introduced (US 1972 Z50AK3), suspension had been added to the rear, as well. The first Monkey bikes had 3.5-by-5-inch (89 mm × 127 mm) wheels, but later models had 3.5-by-8-inch (89 mm × 203 mm) wheels.

The early Z series Mini Trails are still highly popular, decades after the end of production, often selling for several times their original price. Refurbishment and upgrade parts are available from a variety of sources and vendors.

The low power of the 49cc engine used in the Mini Trail and Super Cub has resulted in numerous upgrade possibilities, including replacement with larger and newer Honda horizontal engines.

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