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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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onyerbike
Like this....
https://www.tritownboise.com/cervelo-p-series-seatpost-internal-battery-mount.html
And page 32 in here
https://derby-cycle.com/fileadmin/Downloads/Antriebe/Allgemein/Cervelo/Cervelo_P5_Disc/WEB_I_SEND_Anleitung_1973K3420003_V1_Cervelo_P5_Disc_US-EN_01_2019_US-ENGLISCH.pdf