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Blackburn Airtower Floor Pump gsda internally contoured and relieved to GiantJuneSale 5 taperedUpper tube finish Size:27.5 x 2.1" 5907441517928 internally contoured and relieved to minimize weight and maximize strengthTop Cover: Low friction upper bearing seal completely seals cup from contaminants and is fully captured by the top cover with no loose partsCrown Race: Alloy Dual Seal crown race provides excellent seal efficiency with low frictionCompression Ring: Carbon friendly captured compression ringBearings: Lightweight aluminum steel hybrid Hellbender LITE sealed cartridge bearing offering precise power measurement on the left sideOver 400 hours of operating time ensures long lasting performance on extended ridesUtilizes ANT+ and Bluetooth protocols for seamless connectivity with a wide range of devicesCompatible with SRAM Wide DUB inner bearings for optimal performance and durabilityConstructed with an aluminium axle and carbon crank arms for a lightweight yet sturdy buildExceptional measurement accuracy of 1