Park Tool Electronic Shift Tool (EWS-1) BSS-000597 and Castelli's proprietary Nano Flex

and Castelli's proprietary Nano Flex is often imitated but never equaled

Saves wear and tear on your chain and freewheel

Part No Size Colour/Sidewall Weight TPI PSI 0101866 700x25C Black/Foldable 250g 2/220 73-109 0101873 700x25C Transparent/Foldable 255g 2/220 73-109 0101867 700x28C Black/Foldable 275g 2/220 73-94 0101874 700x28C Transparent/Foldable 280g 2/220 73-94 0101868 700x30C Black/Foldable 295g 2/220 56-73 0101875 700x30C Transparent/Foldable 300g 2/220 56-73 0101869 700x32C Black/Foldable 325g 2/220 50-73 0101876 700x32C Transparent/Foldable 325g 2/220 50-73

Wide Link for durability and precise shifting

Riders who prioritize durability and reliability over marginal weight savings

Park Tool Electronic Shift Tool (EWS-1) BSS-000597 and Castelli's proprietary Nano FlexAbout Park Tool Electronic Shift Tool (EWS 1) A handy tool designed to make installation and removal of bicycle electronic shifting wires and batteries quick and easy. The durable composite body features Park Tool's iconic three way wrench shape and prevents scratching of expensive components. Angled ends allow for safe installation and removal of Shimano Di2 E Tube wires in tight spaces. Universal coin cell tool helps remove and install battery