tubeless tyre

noun

a pneumatic tyre in which the outer casing makes an airtight seal with the rim of the wheel so that an inner tube is unnecessary

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012