Razdan Pass

Razdan Pass cycling climb profile

Razdan Pass is an HC climb that earns that label through duration as much as steepness. The headline numbers are clear: 37.3 km from a start elevation of 1,670 m to a summit elevation of 3,536 m, with 1,866 m of net elevation gain and 1,842 m of total ascent. The average gradient is 5%, while the steepest listed pitch reaches 9.39%.

That combination tells you a lot about how the climb rides. This is not a short wall where survival is the only tactic. It is a long, aerobic climbing effort where the main danger is paying for early enthusiasm much later. A 5% average over this distance can feel deceptively manageable at the bottom, especially if the road settles into a rhythm. But the max gradient of 9.39% means the climb is not simply a smooth tempo ramp. There are sections where torque demand rises sharply, and those ramps matter more because they arrive inside a very long climb.

How the gradient unfolds

From bottom to summit, the profile is best understood as sustained elevation gain rather than repeated punchy climbing. The start at 1,670 m already puts the rider above sea level, and the summit at 3,536 m makes the upper part of the climb a different physiological problem than the lower part. Even if the average gradient stays moderate on paper, the effort cost rises as the altitude increases.

The 5% average suggests much of the ascent can be ridden seated and controlled, but the 9.39% maximum gradient is the key pacing warning. Those steeper sections should not be treated as places to prove strength. They are places to protect the rest of the climb. If you surge over every ramp, the length of Razdan Pass gives the climb more than enough time to expose that mistake.

Pacing and gearing notes

Ride Razdan Pass as a long threshold-management effort, not a sequence of attacks. If using power, anchor the first portion below your sustainable climbing output and keep a buffer for the upper slopes. If riding by feel, the correct early intensity should feel almost too easy. That is usually the right sign on a 37.3 km climb.

A low climbing gear is strongly recommended. The average gradient may not demand extreme gearing on its own, but the combination of length, elevation gain, and ramps near 9.39% makes cadence preservation important. Once cadence collapses, the climb shifts from aerobic control to muscular damage, and that is a poor trade on an HC ascent.

For riders pacing from /glossary/ftp, the priority is restraint. Smooth power, steady cadence, and conservative responses to the steepest pitches are the fastest way to make Razdan Pass feel like one climb rather than a long fade to the summit.