To install the Vacuum ahead cap base on multiple bikes, simply screw the plain replacement ahead cap onto each bike. Attach the base to the bike where the Vacuum is currently needed. The easy-to-release knurled screw makes switching between bikes quick and simple.Fits all 1 1/8 threadless headsetsFor installation on the Aheadset cap FIDLOCK Fidlock Vacuum AHeadset Cap Base Phone Bag and Holder EAN: 4251207401923