https://c5.me.uk/wiki/ 2026-11-01T17:44:47+00:00 https://c5.me.uk/wiki/ https://c5.me.uk/wiki/lib/exe/fetch.php?media=wiki:logo.svg text/html 2026-11-01T00:04:14+00:00 Anonymous (anonymous@undisclosed.example.com) https://c5.me.uk/wiki/doku.php?id=guides:batteries_and_charging&rev=1793491454&do=diff Batteries and charging The battery is the C5's fuel tank. Original Oldham batteries are now long dead, so almost every C5 on the road today runs on a replacement. This page covers the original system and the modern options. Part details are on Battery and charging. The original system text/html 2026-11-01T00:04:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://c5.me.uk/wiki/doku.php?id=guides:buying&rev=1793491455&do=diff Buying a C5 Buying checklist Based on c5owners.com's buying guide and owners' experience. * Have the motor and electrics been tested? * A C5 described as “untested” usually just has a dead original battery and nothing to connect a modern battery to. Many run fine once powered up. But buying untested is a gamble on the pod's ULA chip and the control box. text/html 2026-11-01T00:04:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://c5.me.uk/wiki/doku.php?id=guides:driving_and_maintenance&rev=1793491455&do=diff Driving and maintenance This page summarises the procedures in the Sinclair C5 Owner's Handbook (Sinclair Vehicles, 1985; 38 pp.). Page numbers refer to the handbook. “Left” and “right” are as seen from the driving seat. Figures are from the handbook unless a note says otherwise. text/html 2026-11-01T00:04:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://c5.me.uk/wiki/doku.php?id=guides:electrics_explained&rev=1793491455&do=diff How the electrics work How the C5's electrics work: the instrument pod and its ULA chip, the control box, the motor protection layers, the battery gauge, and the charger. This page is based mainly on The Unofficial Sinclair C5 Service Manual. It draws on the original engineering paper by text/html 2026-11-01T00:04:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://c5.me.uk/wiki/doku.php?id=guides:fault_finding&rev=1793491455&do=diff Fault finding Known problems (Unofficial Service Manual) * Commutation diode (D1) failure * If the C5 is pushed backwards at anything above a crawl, the motor acts as a generator. That forces a large current through the commutation diode in the control box, which text/html 2026-11-01T00:04:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://c5.me.uk/wiki/doku.php?id=guides:modifications&rev=1793491455&do=diff Modifications Legal note: anything that lets the motor push a C5 faster than 15.5 mph, uses a motor rated above 250 W, or removes the pedals takes it outside the EAPC rules. It then becomes a motor vehicle for road-use purposes. See Legislation. Battery and power wiring text/html 2026-11-01T00:04:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://c5.me.uk/wiki/doku.php?id=guides:restoring&rev=1793491455&do=diff Restoring a C5 See Buying a C5 for what to check before you buy. Restoration workflow This follows the typical “budget restoration” written up on c5owners.com, cross-checked against the Owner's Handbook and the Hoover training notes. 1. Strip * Remove the boot: open it, pull the two retaining clips down off their bosses, spring the wheel arches outward and lift the boot away. text/html 2026-11-01T00:04:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://c5.me.uk/wiki/doku.php?id=guides:specifications&rev=1793491455&do=diff Specifications Technical data for the production Sinclair C5 (1985). Where period sources disagree, the conflict is noted rather than resolved. Summary Item Value Source Vehicle class (UK) Electrically Assisted Pedal Cycle (EAPC), 3-wheel EAPC Regulations 1983; Unofficial Service Manual text/html 2026-11-01T00:04:16+00:00 Anonymous (anonymous@undisclosed.example.com) https://c5.me.uk/wiki/doku.php?id=guides:start&rev=1793491456&do=diff Guides Practical guides for owning, restoring and understanding a Sinclair C5. For individual parts, see the parts list. Owning a C5 * Buying a C5: what to check and what adds value * Driving and maintenance: the Owner's Handbook in summary: controls, instruments, routine maintenance * text/html 2026-11-01T00:13:30+00:00 Anonymous (anonymous@undisclosed.example.com) https://c5.me.uk/wiki/doku.php?id=guides:the_law&rev=1793492010&do=diff The law This page is a summary for owners, not legal advice. Laws, insurers' policies and police practice change. Check the official sources listed at the bottom (GOV.UK and legislation.gov.uk in Great Britain; Rijksoverheid and the RDW in the Netherlands) and your insurer before riding on public roads. Last checked: 1 November 2026.