Step-through frame

A step-through frame (aka open frame or low-step frame) is a type of bicycle frame, often used for utility bicycles, with a low or absent top tube or cross-bar.

Traditionally, bicycles with a step-through frame were known as "Ladies'", "Women's", or "Girls'", mainly for their advantage to riders wearing skirts or dresses. Bicycles with a high top tube (cross-bar), known as a diamond frame, were known as "Men's", "Gents'", or "Boys'". As a result of changing clothing styles since the late 20th century, descriptions that describe the frame style, rather than the presumed sex of the rider, are becoming increasingly common.

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