Cardiff Bay is well equipped for accommodating bicycles with 3 cycle-parks around Wales Millennium Centre and more dotted throughout the Bay.
Cardiff Pedal Power can support all your cycling needs. They have a variety of bikes and trikes for hire, and that includes helmet and lock. Located right next to Eisteddfod Camping in Pontcanna, they are the simplest , healthiest and most environmentally friendly way to get into the heart of the Eisteddfod at Cardiff Bay. They are open 09:00 – 18:00, seven days a week but it’s worth booking in advance to avoid disappointment. Further details can be found at www.cardiffpedalpower.org or call 02920390713.
You can also visit nextbike UK, Cardiff’s bike share scheme.
Details here https://www.nextbike.co.uk/en/cardiff/
The main cycle route in Cardiff is known as the Taff Trail and it links Cardiff Bay with Cardiff City Centre and Cardiff Central Railway Station - look out for Taff Trail signs running along side the river from opposite the Millennium Stadium.
The Taff Trail also continues northwards providing a cycle friendly route all the way to Brecon. There is also a cycle lane and footpath, running along the A4232 from the Cardiff Bay Retail Park.
Map of the Area - http://www.sustrans.org.uk/
Taff Trail Information - www.tafftrail.org.uk/
Cycle Safety Site - www.roadsafety.cardiff.gov.uk/cyclist
Cycle Safety Site - http://www.cycletrainingwales.org.uk/