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A bicycle fork is the part of a bicycle that holds the front wheel. A fork typically consists of two ''blades'' which are joined at the top by a fork ''crown.'' Above the crown, a ''steerer tube'' attaches the fork to the bicycle and the handlebars (via a stem) allowing the user to steer the bicycle. The steerer tube of the fork interfaces with the frame via bearings called a headset mounted in the head tube. At the bottom of the fork, ''dropouts'' hold the wheel. Usually, either the axle is bolted to the fork, or a ''skewer'' passes through a hollow axle, clamping the axle to the fork. The term ''fork'' is sometimes also used to describe the part of a bicycle that holds the rear wheel, which on 19th Century ''ordinary'' or ''penny-farthing'' bicycles was also a bladed fork. On most modern bicycle designs the rear wheel is now attached to a rear triangle made up of multiple triangulated tubes, rather than an actual fork, but the ''rear fork'' usage persists. ==Dimensions== Forks have several key dimensions which include: offset, length, width, steerer tube length, and steerer tube diameter. 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「Bicycle fork」の詳細全文を読む スポンサード リンク
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