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head tube
The head tube is the part of a tubular cycle's frame that the front fork steer tube is mounted within.〔(【引用サイトリンク】 Chopper kit installation Guide )〕 On a motorcycle, the "head tube" is normally called the steering head. On bicycles the manufacturer's brand located on the head tube is known as a head badge.
==Bearings==
The head tube holds the bearings which allow the front fork steer tube to pivot freely.
* In bicycles, these bearings are collectively called the headset. These are usually ball bearings, although some headsets use needle bearings.〔(【引用サイトリンク】 Stronglight Bicycle Components JD A9 Threaded Headset with Needle Bearings )〕
* In motorcycles, these bearings are also referred to as headset, or ''steering head bearings''〔(【引用サイトリンク】 Motorcycle Cruiser How to Service Motorcycle Steering-Head Bearings )〕 or ''steering neck bearings''.〔(【引用サイトリンク】 Motorcycle Maintenance )〕 These are usually tapered roller bearings.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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