Schwalbe SV17 Inner Tube - 700c
RRP £7.99 Save 50.5%
Schwalbe SV17 700 x 28-45mm Presta Tube - 40mm Valve
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
DaveBest tubes out there, and this was by far the best price I could find.