The full ride started and finished at Smales Farm on the North Shore, heading across the bridge to Harbour Park in Westhaven and back.
Motorists were also warned to expect delays as the event began from 6am with most of the bridge lanes being blocked off.
Several cyclists took to twitter to post pictures of the event.
Katherine Badham posted, Ready to roll out! @BiketheBridgeNZ @MercuryNZ @SkodaNZ @MultipleScelorsisAkl #BiketheBridgeNZ
Sara Winther posted, Bit of a cruise this morning on the MTB for the #BiketheBridgeNZ thanks @SkodaNZ for coffee! #ms @Kiwivelo