The Halfords Presta Bike Inner Tube is a reliable replacement tube for 29" MTB and hybrid bikes with Presta valves. This bike inner tube (1.9"-2.5") features a Presta valve with a 40mm length for easy inflation and compatibility with 29" wheels. Lightweight, durable, and ready to get you back on the trail in no time after a puncture. Buy your bike inner tubes at Halfords, the UK's largest bike accessories retailer.