40 km out-and-back loaded with 700 m of punchy elevation, gravel shoulders, and total sunrise isolation over the new airport earthworks.
40 km•720 m•2 h 20 m•Sep 3, 2025
Key moves
Warm-up on the Metro: Take Line 1 to Hadan with bikes allowed after 05:30. The GPX starts outside Exit 5 on a low-traffic feeder.
Two summits: One paved, one hardpack. You will see 12–14% ramps but each lasts <3 minutes.
Return transfer: Use the left-side bus lane while descending; traffic is light pre-8 am but the concrete ruts will grab skinny tires.
Safety checklist
32c or wider tires survive the concrete seams.
Bring an orange rear light—fog hides tail lights faster than you expect.
Download KakaoMap offline; LTE coverage flickers once you crest the ridge.
Camp coffee option
There is enough flat real estate near the vista point to set up a tiny stove. Please pack out gas canisters—Gadeok has zero pickup services and we want to keep this sunrise session discreet.
Related routes
Centum City → Namcheon
Centum ↔ Namcheon commuter lanes
12 km connector stitching Centum City, Suyeong, and Namcheon with as few bus conflicts as possible.