A
bottle cage is device used to affix a
water bottle to a
bicycle. Composed of
plastic,
aluminum,
stainless steel,
titanium or
carbon fiber, it is attached to the main
frame of a bicycle, the
handlebars, behind the
saddle, or, in uncommon cases, the
fork. Most modern bicycles have threaded holes in the frame to hold the bottle cage, often called
braze-ons even though they may be
welded,
glued,
riveted, or moulded into the frame material. Clamps are necessary on bicycles not so equipped, such as older or less expensive models.