The product range of tubes for mountainbike tires is quite extensive. You'll find normal tubes as well as lightweight and ultra-lightweight tubes.

Unitube	ETRTO	Dimension	D40	A40	S42	S60
MTB 26	47/62 - 559	26 x 1.75-2.5	x	x	x	x
MTB 26 Light	47/62 - 559	26 x 1.75-2.5			x [126 g]
MTB 26 Supersonic	47/54 - 559	26 x 1.9-2.1			x [100 g]
MTB 26 Freeride	62/70-559	26 x 2.5-2.7		x	x
MTB 26 Downhill	62/70-559	26 x 2.5-2.7		x
MTB 29 inch	47/62 - 622	28/29 x 1.75-2.5	x	x	x

The advantages of the Continental Unitube system

• Multi-size tubes allow greater compatibility with more tire sizes, and fewer tubes.
• Unitubes are available in both Schrader and Presta valve tubes. Presta valves are available in a variety of lengths.
• All tubes are seamless and mold-cured (vulcanized) to ensure uniform roundness and improved reliability at the valve stem.
• Each and every tube passes a stringent 100% quality control inspection