Schwalbe SV21/AV21 - 27.5 x 1.50 - 2.40" (650B) Schrader or Presta Inner Tube
Extremely airtight! The Butyl rubber compound prevents pressure loss and fewer occasions 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
Hard to find this size of tube with right valve locally. Merlin had it and at half the price of bike shop.
Not a lot to say really decent quality innertube, does what its supposed to.
Very good quality inner tubes. come with better dust caps than other brands I have bought. Paired with the Schwalbe marathon plus MTB tyres on my E bike hope to reduce the risk of punctures. Like the fact these are designed to be less porous and so retain air for longer.