From the Hackney Rank at Cardiff Central Train Station to Boulders indoor climbing centre. This video gives turn by turn directions for the council approved route.

Roads
Saunders Rd
Penarth Rd
Customhouse St
Bute Terrace
Adam St
Moira Terrace
Glossop Rd
Newport Rd
Four Elms Rd
Broadway
Newport Rd
Rover Way
Pengam Rd
St Catherines Business Park