This is Continental's product range of tubes for smaller tires, i.e. in diameter equal to or smaller than 24 inch.

unitube	dimension	D	D40	A	ETRTO	versions
Compact 8	54 - 110	x			54 - 110	8 1/2 x 2
						8 x 1 3/4
Compact 10/11/12	44/62 - 194/222	x		x	44-194	10 x 1 5/8
					47, 57, 62 - 203	12 1/2 x 1,75 - 1,90
						12 1/2 x 2 1/4
-	-			x	200 - 50	200 x 50
Compact 14	32/47 - 279/298	x			37, 44 - 288	350A
					32, 37 - 298	14 x 1 1/4 - 1 3/8 - 1 1/2
Compact 16	32/47 - 305/349	x			47 - 305	16 x 1,75
					32, 37 - 340	16 x 1 3/8 - 1 1/2
						400A
Compact 16 wide	47/57 - 305	x			47, 54, 57 - 305	16 x 1,75 - 1,90 - 2 - 2,125
Compact 18	32/47 - 355/400	x			47 - 335	18 x 1,75 - 1,90
					37 - 390	450A
					32, 37 - 390	18 x 1 1/4 - 1 3/8
Compact 20 slim (also S36)	28/32 - 406/451				28, 32 - 406	20 x 1 1/8 - 1 1/4
Compact 20 (also S36)	32/47 - 406/451		x	x	32, 37, 40, 47 - 406	20 x 1 1/4 - 1 3/8 - 1,50 - 1 1/2
					37 - 440	500A
					37 - 451	20 x 1,75 x 2
Compact 20 wide	47/57 - 406		x	x	47, 54, 57 - 406	20 x 1,75 x 2
						20 x 2,0 - 2,125
Compact 24	32/47 - 507/544		x	x	47 - 507	24 x 1 1/4 - 1 3/8 - 1 1/2 - 1,75
					40 - 534	24 x 1 1/2 x 1 3/8
					37, 40 - 540	24 x 1,75 x 2
					37 - 541	600A
Compact 24 wide	47/57 - 507		x	x	47, 50, 54, 57 - 507	24 x 1,75 - 1,9 - 2,0 - 2,125

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