more stats
1,335 ft
Distance
8 ft
Climb
-124 ft
Descent
581 ft
High Point
-115 ft
Altitude change
455 ft
Altitude min
581 ft
Altitude start
466 ft
Altitude end
-8.7%
Grade
-43.1%
Grade max
7.2%
Grade min
253 ft
Distance climb
997 ft
Distance down
82 ft
Distance flat

F=ma Details

  • Activities
    • Mountain Bike
  • Riding Area
    Glenbervie Forest
    Whangarei
  • Difficulty Rating
    Blue Rate
  • Voted Difficulty
    Blue (1 vote)
  • Local Popularity
    85 in Mountain Biking
  • Global Ranking
    #7527 in Mountain Biking
  • National Ranking
    #136 in Mountain Biking · New Zealand
  • Trail Type
    Singletrack
  • Bike Type
    XC
  • Direction
    Downhill Only
    Popular Direction Shown
  • Climb Difficulty
    Blue
  • Physical Rating
    Moderate
  • Trail Visibility
    Always easy to follow
  • TTFs on Trail
    Bridge, Ladder Bridge
  • Year Opened
    2025
  • Land Owner
    Whangarei Mountain Bike Club

Predominantly downhill flowing singletrack, flat corners and fast straight sections but from the bridge at the bottom it's uphill to the end which links back into the very bottom of Douglas Drop.

Access Info

Starts on Firewood road just above the current entrance to Douglas drop and is in fact the old entrance to Douglas Drop which was closed due to a huge slip.

Tags
BridgesFlowySkinnies
Trail Supporters
Local Trail Association
Traditionally Indigenous Territory

Recent Activity on Trail

Past Week
  • 1 rides
  • 16 miles average
6 Months
  • 1 rides
  • 16 miles avg distance
All
  • 17 rides
  • Last: Oct 1, 2026
update trails status or condition

F=ma Trail Reports

statusdatedescription
Oct 2, 2026 @ 10:16am (Pacific/Auckland)
3 days
 First corner bush lawyer wrapped around my neck so emergency stop required, I removed it properly myself and tossed it off the trail. Horse damage...
Feb 27, 2026 @ 11:59am (Pacific/Auckland)
Feb 26, 2026
 Out in the clear cut the weeds are head height by the bridge and there's bush lawyer further along towards the end
Jan 7, 2026 @ 12:04pm (Pacific/Auckland)
Jan 6, 2026
 Looks like another amoeba has ridden a motorcross bike in here, track is torn up again [it's new damage]
Jan 1, 2026 @ 1:02pm (Pacific/Auckland)
Dec 31, 2025
 Motorbike damage
Dec 9, 2025 @ 1:53pm (Pacific/Auckland)
Dec 8, 2025
more »
Status:
on Oct 2, 2026
Variable
Avg: 4.13 (1 votes)
Your vote: 0

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      Directions to f-ma trailhead (-35.652680, 174.350490)
      View on Discover Map

      Photos

      2 more »
      report
      mtb
      44 |
      Nov 10, 2025 @ 7:17pm
      Nov 10, 2025
      report
      mtb
      32 |
      Nov 6, 2025 @ 9:15pm
      Nov 6, 2025

      Videos

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      5.0 ★★★★★
      1 Ratings
      5 ★ 100%
      4 ★
      3 ★
      2 ★
      1 ★

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      Frequently Asked Questions

      ▼ Where is F=ma located?
      F=ma is located in Glenbervie Forest, Whangarei, New Zealand. It is part of the Glenbervie Forest trail network. The trailhead is located at coordinates -35.65268, 174.35049.
      ▼ How hard is F=ma?
      F=ma is rated as Blue difficulty. The physical rating is Moderate. The average grade is 8.7%. The climb difficulty is rated Blue.
      ▼ What is the elevation gain for F=ma?
      F=ma has 8 ft of elevation gain. The trail has 124 ft of elevation descent. The elevation ranges from 455 ft to 581 ft.
      ▼ Is F=ma a point to point trail?
      Yes, F=ma is a point to point trail. The direction is Downhill Only. The trail type is singletrack.
      ▼ How long is F=ma?
      F=ma is 1,335 ft long. The trail type is singletrack.
      ▼ Are dogs allowed on F=ma?
      There is no information about dogs being allowed on F=ma. Check with local trail managers or the trail page for the latest access rules.
      ▼ How do I access F=ma? Where is the closest parking trailhead?
      The closest parking and trailhead locations to F=ma are: View all parking locations in the area.
      ▼ How busy is F=ma?
      F=ma is a very popular trail. There have been 23 recorded activities on this trail. The trail has received 30 check-ins. View recent activity on this trail.

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