For all kinds of city and trekking tires you can find suitable tubes in Continental's range.

Unitube	ETRTO	Dimension	A40	D40	S42	S60
Tour 26 slim	28/32 - 559/597	26 x 1 1/8-1.3		x	x
Tour 26	37/47-559/597	26 x 1 3/8-1.75, 650 A/B	x	x	x
Tour 26 Hermetic Plus	37/54-559/597	26 x 1 3/8-2.0, 650 A/B	x	x	x
Tour 28 slim	28/37-609/642	28/27 x 1 1/8-1 3/8 x 1 5/8	x	x	x
Tour 28 all	32/47-622/642	28/27 x 1 1/4-1.75 x 2	x	x	x	x
Tour 28 light	32/47-622/642	28/27 x 1 1/4-1.75 x 2	x	x	x
Tour 28 Hermetic Plus	32/47-622/642	28/27 x 1 1/4-1.75 x 2	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