Extremely airtight! The Butyl rubber compound prevents pressure loss and fewer occassions to inflate. Extremely reliable! Quality control for safer cycling: Each tube is checked twice at the factory to ensure safer cycling. Having the correct pressure means fewer punctures and reduced rolling resistance Features Size: 700 x 28-47c. Valve length: 40mm. Tube materia: Butyl. Weight: 150 g.
Best Price: £4.30 from Merlin Cycles