The Schwalbe Tube No.21 fits 27.5" (or 26") tires with a width of 40-62 mm and is used for mountain bikes.

Due to their excellent manufacturing, Schwalbe tubes have proven themselves in the market for years. They have uniform wall thickness and are round in shape. Thanks to their precise construction, they are durable at the seam. A comparative test showed that the Schwalbe tube retains air pressure significantly longer than other tubes (the others lost almost twice as much air pressure over 30 days as the Schwalbe tube did). A possible reason for this could be a lower butyl content in the other tubes. The special quality of Schwalbe tubes arises from the uniqueness of their rubber compound. To ensure this high quality, every single Schwalbe tube is inflated and checked for at least 24 hours before leaving the factory.

Features:

• Butyl rubber ensures twice the air retention
• 24-hour test for each tube
• High elasticity allows coverage of many tire sizes per tube
• Recycling process achieves a very good energy balance

Fits, among others, tire sizes:

40-584 | 26 x 1 5/8 x 1 1/2 | 650 x 38B
40-584 | 27.5 x 1.50 | 650 x 38B
40-584 | 27.5 x 1.50 | 650B
42-584 | 27.5 x 1.60 | 650B
44-584 | 26 x 1 5/8 | 650 x 1/2B
44-584 | 26 x 1 5/8 x 1 2/2 | 650 x 42B
44-584 | 26 x 1 1/2 x 1 5/8 | 650 x 42B
44-584 | 27.5 x 1.65 | 650 x 42B
44-584 | 27.5 x 1.65 | 650B
47-584 | 27.5 x 1.75 | 650 x 45B
47-584 | 27.5 x 1.75 | 650B
50-584 | 27.5 x 2.00 | 650B
54-584 | 26 x 1 1/2 x 2
54-584 | 27.5 x 2.10 | 650B
57-584 | 27.5 x 2.25 | 650B
60-584 | 27.5 x 2.35 | 650B
62-584 | 27.5 x 2.40 | 650B

Valves:

• AV = Auto, Schrader
• DV = Dunlop, Blitz, German valve
• SV = Sclaverand, Presta, French valve (40 mm)

Scope of delivery:

• 1 x Schwalbe Tube No.21
  including valve