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Product Description Schwalbe's Air Plus Inner Tube 21 for 27.5+ tyres is characterised by its special puncture resistance and air retention and is therefore also suitable for e-bikes and cargo bikes. This is made possible by a 70% higher wall thickness and a high proportion of pure butyl rubber. Guidelines for Replacing E-bike Components:Before you replace components on your e-bike, please read through the guidelines for component replacement for CE-marked e-bikes/pedelecs with pedal assistance. Specifications:Application:City, MTB, TouringETRTO:54-584 to 70-584Tyre Dimensions:27.5 x 2.1 to 27.5 x 2.75Inner Tube Material:butylValve Type:SV / Presta 40 mm, AV / Schrader 40 mmDimensions (ETRTO):27.5 x 2.10 (54-584)27.5 x 2.25 (57-584)27.5 x 2.35 (60-584)27.5 x 2.50 (62-584)27.5 x 2.60 (65-584)27.5 x 2.75 (70-584)Models:27.5x2.10-2.75 SV / Presta 40 mm: Valve Type:SV (Sclaverand/Presta)Valve Length:40 mmType:SV21+APManufacturer Number:10461413 27.5x2.10-2.75 AV / Schrader 40 mm: Valve Type:AV (Auto / Schrader valve)Valve Length:40 mmType:AV21+APManufacturer Number:10461590Valve InformationTubes are available with various valve types. Choosing a valve is dependent on application and the rim's valve hole diameter. SV / Presta Valve: Synonyms:Sclaverand-Valve (SV), French ValveOuter Diameter:6.5 mmGood to know: The valve of all Schwalbe tubes with Presta valves can be unscrewed, e.g. for valve extensions or for filling with tyre sealant. AV / Schrader Valve: Synonyms: Auto Valve (AV), Schrader ValveOuter Diameter: 8.5 mmTechnology:Air Plus: Schwalbe's Air Plus tubes hold the air much longer than other tubes due to their high proportion of pure butyl rubber, so that you need to re-pump less often. Puncture Protection: 70% more wall thickness makes the Air Plus inner tubes exceptionally robust against punctures and snake bites. Contents:1 x Schwalbe 21+AP inner tube Weight: black | 54-584 to 70-584 | Schrader Valve (AV) | 27.5 x 2.10-2.75 AV 40 mm | 40 mm: 400 g black | 54-584 to 70-584 | Presta Valve (SV) | 27.5 x 2.10-2.75 Presta 40 mm | 40 mm: 400 g Manufacturer: Ralf Bohle GmbH Otto-Hahn-Str. 1 51580 Reichshof Germany info@schwalbe.com