Police were called to Woburn Hill in Addlestone soon after 11.30am today (November 3).
The cyclist, a woman in her 50s, was taken to hospital for medical treatment where her condition is not known.
No arrests have been made.
Woburn Hill was closed between Addlestone Moor and the Weybridge Road Station Road roundabout for several hours but has now reopened.
Surrey Police have launched an appeal for witnesses to get in touch with any information.
A Surrey Police spokesperson said: “Were you in the area around Woburn Hill this morning (Monday, 3 November) between 11.30am and 11.35am?
“Do you have any CCTV, dashcam or helmet cam footage which may have captured all or part of this incident?
“If you have any information that could help, please quote PR/45250133505 using one of the options below:
“Use our 24/7 live chat service available on this website (www.surrey.police.uk)
“Use our online form to provide an update to this incident or select from our other contact us forms.
“Call us on our non-emergency number, 101
“If you would rather not speak to police or to prefer to give information anonymously, you can contact independent charity Crimestoppers by calling 0800 555 111 or completing their online form.”
