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Code: AV/SV21F
Schwalbe AV/SV21F - 27.5+ Inner Tubes

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.

Mr mansfield Good price, seem to be quite puncture resistant, run these for years with no problems.
Mr Dudley Good quality inner tubes.