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Tapered head tube and fork.

For increased stiffness and improved steering precision, a tapered head tube (see image on left) and fork pair an oversize lower steerer tube (usually 1 1/2-inch, see image on right) with a standard diameter upper steerer tube (usually 1 1/8-inch). This combination sheds weight compared to a straight 1 1/2-inch system, and adds stability and stiffness when compared to a straight 1 1/8-inch system. The result is a bike that tracks better through corners while allowing for the use of standard stems.