Park Tool SW-18 Internal Nipple Spoke Wrench - 5.5mm Hex Box Pack The whole is rounded off

The whole is rounded off by the no less advanced

160/160mm CL800 rotors

10-33 Chain SRAM Force-E1

The tail of the helmet also has an aerodynamic purpose

Rear Cogs Shimano Ultegra R8100

Park Tool SW-18 Internal Nipple Spoke Wrench - 5.5mm Hex Box Pack The whole is rounded offSome wheels feature spoke nipples accessible only through holes on the outside of the rim. The SW 18 is specifically designed to access these hard to reach internal nipples. Features a comfortable dual density handle and an extra long shaft for deep aero rim cavities. Specifications Sized for 5. 5 mm hex shaped internal nipples Shaft length: 825 mm (3. 25") Shaft outside diameter: 8. 2 mm (0. 32") Mfr Claimed Weight TBC