Tackle one of cycling’s longest sustained ascents: an assisted 4-day ride from Bogotá toward Alto de Letras. Expect 80 km of climbing, changing ecosystems, and support on the road.
More ways to explore the area's outdoor wonders
You roll out of Bogotá before dawn, city lights shrinking as the road eats miles south and the air sharpens. By mid-day the valley opens—river, sugarcane, and the tile roofs of Guaduas—and the first whispers of the climb begin. Over the next days the landscape changes like chapters: lowland river corridors, coffee farms, then cloud forest as the road angles up for the long, relentless ascent to Alto de Letras.
Difficulty
challenging
Duration
4 days
Fitness Level
Experienced endurance cyclists with strong aerobic fitness and previous multi-hour climbs.
Wildlife
History
The route passes towns—Guaduas and Honda—linked to colonial river trade and independence history; Alto de Letras later gained fame among cyclists as a supreme test.
Conservation
Heavy cycling and vehicle traffic can strain roadside ecosystems; use local services, avoid littering, and stick to paved routes to limit erosion.
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Pace the climb
Start conservatively—sustained climbs punish riders who go too hard early; aim for steady watts and frequent short breaks.
Gearing matters
Bring a compact chainring or a wide-range cassette to keep cadence high on long gradients.
Hydrate and eat frequently
Plan for 500–750ml fluids per hour and small, frequent snacks; the support vehicle can top up supplies.
Layer for elevation
Temperatures can drop quickly near the summit—pack a lightweight insulated jacket and waterproof shell.
Road or gravel bike with low gearing
A bike with compact gearing or a wide cassette helps maintain cadence on long grades.
Well-fitted helmet
Protects against crashes and is required by guides for group rides.
Hydration system (bottles or bladder)
Ensures continuous fluid intake on long, exposed climbs with limited services.
Light insulated jacket and waterproof shell
Layers protect against rapid temperature drops and rain at higher elevations.