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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.〔(【引用サイトリンク】 Top Tube )〕 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. ==Advantages== * less risk of stretching or ripping clothes when mounting the saddle * the rider can wear a skirt (also requires a skirt guard and possibly a chain guard) * very quick to mount and dismount, so is suitable for delivery bicycles, or any journey with many stops * suitable for elderly and others with restricted agility * potentially safer than a high top tube; a rider who loses balance can step through the bicycle without becoming entangled * compactness provides a popular starting point for folding bicycles. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Step-through frame」の詳細全文を読む スポンサード リンク
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