You can reach the Elbe source (pramen Labe) from Špindlerův Mlýn using the chair lift to Medvědín (1,235 m. a. s. l., you can take your bike). The official signposting of the Elbe cycle route/national cycle route 2 ends/begins at the chair lift station to Žalý in Vrchlabí - Herlíkovice. After you have taken the chair lift to Žalý (1,019 m. a. s. l., you can take your bike) you continue on Giant Mountain cycle route K10 to Benecko and further on along the route K 13 to Třídomí. From here you will use the cycle route K11 to Špindlerův Mlýn.
As alternative you can use the cycle bus from Vrchlabí to Špindlerův Mlýn during the main cycle tourist season (June – September).
From the upper station of the chair lift station Medvědín in Špindlerův Mlýn you continue on the Masaryk road via Vrbata chalet to Elbe chalet (Labská bouda). You have to lock your bicycle here. The Elbe source (1,386 m. a. s. l.) is set in the centre of the national park Giant Mountains (Krkonoše), and the last 500 meters metres can only be tackled on foot.
Back to Vrchlabí you can cycle along the cycle route K13 via Horní Mísečky to Benecko and then via Křížovky to Vrchlabí.