Schwalbe Sv17 Inner Tubes Are Designed & Manufactured To Retain Air Pressure Considerably Longer Than Their Competitors Not Only Is Each Individual Tube Inflated & Inserted Into A Mould To Ensure That There Is Even Wall Thickness & Excellent Air Retention They Are Also Stored Under Pressure For 24Hrs To Test Air Retention Fits All Of The Following Size Tyres: 27 X 1-12 (40-609) 700 X 28C (28-622) (28 X 110) 700 X 30C (30-622) (28 X 120) 700 X 32C (32-622) (28 X 125) 700 X 35C (37-622) (28 X 140) 700 X 38C (40-622) (28 X 150) 700 X 40C (62-622) (28 X 160) 700 X 45C (47-622) (28 X 175) 27 X 1-14 (32-630) 700 X 38B (40-635) (28 X 1-12) Airtightness: Schwalbe Tubes Retain Air Pressure Considerably Longer The Quality And The Material Purity Of The Rubber Mixture Directly Effects The Quality Of The Tube Each Schwalbe Tube Is Individually Inflated And Inserted Into A Mold This Ensures The Even Wall Thickness And Excellent Air Retention Reliability: Consistent Quality Control Brings With It The Security Of Use: Each Tube Is Inflated At The Factory And Stored Under Pressure For 24 Hours In Order To Test The Air Retention Group Tube System: The High Elasticity And Quality Material Used In Our Tubes Allows A Great Many Tyre Sizes To Be Covered Only An Extremely High-Quality And Reliable Tube Is Up To This Requirement Retains Pressure Longer In Comparative Tests Against Other Tubes (Including Named Brands Own-Label Brands And No Name Products) The Result Was Clear Over A Period Of 30 Days The Other Tubes Lost Nearly Twice As Much Pressure Than Schwalbe Tubes Possible Reasons: Less Butyl Content Or Lower Quality Of Of Butyl Schwalbe Is Uncompromising In Its Standards Despite Ever Increasing World Market Prices Of Butyl
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