Borasu Pass

Borasu Pass cycling climb profile

Borasu Pass is not a climb where the headline numbers need much translation. At 15.8 km, an average gradient of 13.68%, and a summit elevation of 5154 m from a 3000 m start, this is an HC ascent defined by sustained steepness and a large vertical load.

The key point is the relationship between length and gradient. A short wall can average this steep and be managed as a force effort. Over 15.8 km, 13.68% becomes a pacing problem before it becomes a strength problem. The climb gains 2154 m net from bottom to summit, while the supplied profile lists 2069 m of total ascent. Either way, the demand is clear: this is a long, slow, high-torque effort with little room to hide.

How the gradient unfolds

The available profile does not give detailed kilometre-by-kilometre ramps, so the safest read is to treat the average as the defining feature. A 13.68% mean over this distance implies that even the more manageable portions are unlikely to feel truly easy. The maximum gradient of 33.53% also matters tactically, because it tells you the climb contains at least one section where momentum disappears quickly and cadence can collapse if you arrive over-geared.

That makes Borasu Pass a climb to ride from the bottom with restraint. The opening has to be controlled because the average gradient is already above what most riders can sit on comfortably for a long duration. If you pace it like a normal mountain climb, the steepest pitch will expose that mistake later.

Pacing and gearing notes

The practical approach is simple: gear for the maximum gradient, pace for the average gradient, and respect the elevation gain.

• Start below threshold rather than trying to settle immediately at /glossary/ftp intensity.
• Keep cadence as stable as the slope allows, but expect low-cadence torque demands on the steepest ramps.
• Use the easiest climbing gear you can justify. A bailout gear is not optional on a climb with a 33.53% maximum.
• Avoid repeated surges. On a climb this steep and this long, accelerations are expensive because they create muscular fatigue before the summit work is done.

The biggest mistake on Borasu Pass would be treating the average gradient as just another data point. Here, the average is the story. Over 15.8 km, 13.68% means every pacing decision compounds, and the rider who protects torque and breathing early is the one most likely to still be moving efficiently near the 5154 m summit.