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Glen Loin Loop

Grading: hard.

An awesome ride through the rugged splendour of the Arrochar Alps. Well-known to local riders, the circuit involves a long climb and stunning mountain scenery, followed by a fast descent and techy single track to finish. Starts / finish in Arrochar.

At a glance

  • Description: clockwise
  • Distance: 18km /11.3 miles
  • Ascent: 580m
  • Type: mountain bike circuit
  • Signage: Forestry Commission Scotland

View of Ben Lomond

Route description

From the car park in Arrochar (OS Grid Ref. NN 294 048) turn right, then left and follow the road through Succoth village to the forest entrance (OS Grid Ref. NN 298 059). The forest road climbs steadily through the conifers and contours around the triptych of Beinn Narnain (926m), Creag Tharsuinn (781m) and A’Chrois (849m) into the atmospheric Allt Coiregrogain. After crossing the stream, a sweeping 3.6km descent passes beneath the southern flank of Ben Vane (916m) – watch out for the occassional rough section.

Turn right (A) at OS Grid Ref. NN 303 092 towards Coiregrogain Farm. Cross the bridge over Inveruglas Water, turn immediately left and follow a section of joyous single-track weaving through the forest. A short, steep climb leads into fairly technical descent and more quality singletrack along Glen Loin. After the Stronafyne properties turn right (B), then left (C) and follow the Loin Water to the main road. Turn right (D) and follow the road back to the car park.


Loch Sloy dam

Points of interest

  • Loch Long and Loch Sloy
  • Hill quality hill walking and climbing in the Arrochar Alps: The Cobbler (884m), Beinn Narnain (926m), Beinn Ime (1011m) Ben Vane (916m), Ben Vorlich (943m), Ben Lomond (974m)
  • Hill walking around Loch Sloy
  • Waterbus and cruises on Loch Lomond departing from Tarbet


Arrochar has refreshments, pubs, shops, toilets, cycle racks and accommodation.

Download route card

Details are current as of October 2015. Whilst the Loch Lomond & The Trossachs National Park Authority and its project partners have made every effort to ensure the accuracy of the route card information, Loch Lomond & The Trossachs National Park Authority and its project partners cannot be held responsible in any way for any changes that may take place to the routes, nor for any errors in the route cards, nor for any accidents, injuries or damage sustained whilst following the routes. Cycling is a risk sport and all persons using the cycle routes do so at their own risk, acknowledging and accepting the risk of accident, injury or damage.

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