If you want to enter Su Camminu de sa Serra via the bridge you must necessarily put your bike on your shoulder. The segment is not suitable for cycling (perhaps downhill, if you are good) crossing exposed basalt rocks and steep slopes. The path is not properly traced but the passage is intuitive. The last stretch may be hidden by tall grass in the spring period (see the photo with the bike in the highlight, which appears in the advert with Su Camminu), but it is clearly visible during the dry season.