There are several option to get to the Montjuic, depending on what you would like to visit on the mountain.
If you would like to visit the Olympic stadium, the Olympic swimmingpool, Joan Miro Museum or connect with the cable car towards the castle then we recommend going there by metro and Funicular. It is a fast and cheap option.
From the bicycle shop you walk 5 minutes to Las Ramblas, on Las Ramblas you take a left turn for 3 minutes until you see the metro sign L3 Green line. There you can take the green line R3 direction Zona Universitària (single ticket is €2,40 billete sencillo) You get off at the stop of PARAL-LEL 2 stops/ 3minutes.
There you look for the sign FUNICULAR MONTJUIC, you do not have to pay extra and the same ticket is valid.
*There is also the option to take the cable car from La Barceloneta, Passeig Joan de Borbó / Plaça del Mar Single ticket: €11.00. Return ticket: €16.50.