This trail is flagged for cleanup, the GPS track most likely crosses itself. You can help by editing the trail and cleaning up the GPS points.
1 miles
527 ft
-488 ft
Avg time


  • Riding area
    Lantau Island
    My City
  • Difficulty rating
  • Trail type
  • Bike type
    AM, XC
  • Trail Usage
    Biking Primary
  • Direction
    Downhill Primary
    Popular direction shown
  • Climb Difficulty
  • Physical rating
  • Season
    Not great in the wet or heat
  • TTFs on trail
    Rock Garden
  • Global Ranking
  • Year Opened

Use this trail to make Chi Ma Wan into a complete loop. Some tech rocky descents and nasty little climbs. Be especially cautious on the last 200 metres. Originally called Pierre's Trail, but name has changed to AA extension. Was once illegal, but now seems to be widely accepted by AFCD as acceptable to ride.

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More Stats for AA extension / Pierre's Trail mountain bike trail
  • Altitude change
    39 ft
  • Altitude min
    123 ft
  • Altitude max
    298 ft
  • Altitude start
    149 ft
  • Altitude end
    188 ft
  • Grade
  • Grade max
  • Grade min
  • Distance climb
    3,808 ft
  • Distance down
    3,124 ft
  • Distance flat
    443 ft
  • Avg time
  • view trail stats
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Layers winter
Trail Style
  • ?
Trail Conditions
  • Unknown
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Dry
  • Very Dry
Directions to aa-extension--pierre-s-trail trailhead (22.238470, 113.987920)
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