• Functionality - This water bottle cage is excellent for all types of bikes with a proper mounting spot and screws. Both wide-mouth and narrow-mouth 32oz Nalgene bottles will fit perfectly snug into it. • Strength - The cage is constructed with rugged Polylactic acid which is 100% bio-sourced plastic. This makes it capable of the technical and rocky trails on a mountain bike as well as the rapid speeds of a road bike. • Geometry - The inside diameter is approximately 92mm wide while the outside diameter is 99mm. The cage stands 180mm tall. It's also equipped with 5 mounting positions for optimal configuration and fit. The bottom piece is crafted to hug your water bottle, so it never comes out while riding: primarily when you don't want it.