17 miles
Distance
1,880 ft
Climb
-1,881 ft
Descent
439 ft
High Point

A customizable, base-idea loop that includes Tunnel 4, Deer canyon, Ocean Air/Carmel Mt and PQ canyon. Mostly easy trails, but beginners may need to walk a few steep sections and obstacles, or change the route a little.

Typically ridden counter clockwise to descend a couple steeper trails, but could also be ridden clockwise, maybe with some route changes, to use less steep climbs.

Customize the route with other trails like ride Switchbacks or Eucalyptus instead of Tunnel 4, or add Tunnel 1. Use the easy del Mar Mesa Road bypass instead of steeper Palacio Drop. Return to PQ canyon using Side Hill or Cobbles instead of Waimea. Or go further west to hit Return of the Crabs.

Local Trail Association
San Diego Mountain Biking Association (sdmba.com)
Please consider joining or donating to the local riding association to support trail development & maintenance.
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Details

  • Riding area
  • Primary Activity
    Mountain Bike
  • Difficulty rating
    Green
  • Route Type
    Loop
  • Bike type
    AM, XC, CX, Gravel
  • Direction
    One Direction
  • Physical rating
    Moderate
More Stats for Tunnels and Ocean Air Loop mountain bike route
  • Altitude min
    59 ft
  • Altitude start
    237 ft
  • Altitude end
    237 ft
  • Grade max
    -36.244%
  • Grade min
    30.013%
  • Distance climb
    8 miles
  • Distance down
    7 miles
  • Distance flat
    2 miles
Avg: 5 (1 votes)
close
Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
Trail Ridden Direction
Trailforks scans users ridelogs to determine the most popular direction each trail is ridden. A good flowing trail network will have most trails flowing in a single direction according to their intension.
The colour categories are based on what percentage of riders are riding a trail in its intended direction.
  • > 96%
  • > 90%
  • > 80%
  • > 70%
  • > 50%
  • < 50%
Trail Last Ridden
Trailforks scans ridelogs to determine the last time a trail was ridden.
  • < 2 days
  • < 1 week
  • < 2 weeks
  • < 1 month
  • < 6 months
  • > 6 months
Trail Ridden Direction
The intended direction a trail should be ridden.
  • Downhill Only
  • Downhill Primary
  • Both Directions
  • Uphill Primary
  • Uphill Only
  • One Direction
ContributeDetails
Colors indicate trail is missing specified detail.
  • Description
  • Photos
  • Description & Photos
  • Videos
Trail Popularity ?
Trailforks scans ridelogs to determine which trails are ridden the most in the last 9 months. Trails are compared with nearby trails in the same city region with a possible 25 colour shades. Think of this as a heatmap, more rides = more kinetic energy = warmer colors.
  • most popular
  • popular
  • less popular
  • not popular

LEGEND
Trail Difficulties
  • Access Road/Trail
  • White
  • Green
  • Blue
  • Black
  • Double Black Diamond

Trail Report Status
  • Clear / Green
  • Minor Issue / Yellow
  • Significant Issue / Amber
  • Closed

  • Land Owner Overlay
  • Wilderness (typically no bikes in USA)
  • BLM (public)
  • USFS (Wildlife sanctuaries darker than usfs)
  • State land
  • Indigenous
  • Military
Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
  • Map Markers
  • trail Trail Head
  • photo Photo
  • place Directory Listing
  • region Riding Area
  • TTF TTF
  • Parking Parking
  • Viewpoint Viewpoint
  • Information Information
  • Warning Warning
  • Directions Directions
  • Sight Sight
  • Restrooms Restrooms
  • eBike Charging Point eBike Charging Point
  • Water Fountain/Source Water Fountain/Source
  • Gate Gate
  • Trail Sign Trail Sign
  • Table or Bench Table or Bench
  • Ladder Ladder
  • Stairs Stairs
  • Bridge Bridge
  • Camping Camping
  • Cabin Cabin
  • Lodge Lodge
  • Bear Cache Bear Cache
  • Dock Dock
  • Ranger Station Ranger Station
  • Summit Summit
  • Other Other
      Trail transparency
      11 | 1 comments
      10 | 2 comments
      UNCUT - Tunnels - Adaptive MTB - PQ Canyon -...
      UNCUT - Tunnels - Adaptive MTB - PQ Canyon - San Diego, CA
      trail: Tunnel 4
      9:45 | 31 | comments: 0 | favs:
      Mar 12, 2020
      HIGHLIGHTS- Two Bridges - Adaptive MTB - PQ...
      HIGHLIGHTS- Two Bridges - Adaptive MTB - PQ Canyon - San Diego, CA
      0:49 | 7 | comments: 0 | favs:
      Mar 12, 2020

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      Mar 29, 2020 @ 12:19pm
      Mar 29, 2020
      Powerline
      Mar 29, 2020 @ 12:17pm
      Mar 29, 2020
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      Mar 29, 2020 @ 12:16pm
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      more reports »
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