Passo Tanarello

Overview

Passo Tanarello is an HC climb in France, rising from a start elevation of 821 m to a summit of 2,038 m. Over its 14.4 km it delivers a net elevation gain of 1,217 m at an average gradient of 8.45%. The HC classification is earned: this is a long, sustained ascent that sits well beyond the reach of a casual effort and demands real preparation.

The number that reshapes the ride is total ascent. While the net gain is 1,217 m, the climb accumulates 2,239 m of total ascent — a difference of 1,022 m. That gap means roughly a thousand metres of descending and re-climbing woven into the route. You do not simply grind uphill; you repeatedly lose altitude and win it back, which inflates the real workload far above what the net figure suggests and punishes riders who pace only to the average.

How the Gradient Unfolds

The 8.45% average is a blend, not a constant. With over a thousand metres of hidden re-ascent, the profile swings between genuine downhill respite and pitches far steeper than the average implies. Read the terrain, not the mean.

• Flatter and descending sections that offer recovery but cost you rhythm and momentum
• Repeated short climbs where you regain the metres you just gave up
• Steep ramps that spike well above 8.45% and force you out of any comfortable cadence
• Long sustained middle grades that sit near the average and set the aerobic tone

Pacing Notes

On an undulating climb like this, even-effort beats even-speed. Chasing a fixed speed forces you to surge on every ramp and coast through every dip, burning matches you will need higher up. Anchor your effort to a target power or perceived exertion and let your speed rise and fall with the terrain.

Set that anchor below your sustainable power output so the repeated re-climbs don't accumulate into a blow-up. If you don't know your ceiling, run the FTP estimator first and pace to a percentage of it. Ease slightly on the descents, hold steady through the steep pitches, and treat the flatter sections as active recovery rather than a place to attack.

Gearing

Gear for the steepest ramps, not the average. On an 8.45% mean with pitches that climb well above it, and 2,239 m of total ascent in the legs, you want a compact or sub-compact chainset paired with a wide-range cassette. A 34×32 will get most riders through; a 34×34 gives you the extra margin to spin the steep sections rather than grind them.

Check your setup before the ride. Confirm your chainring and cassette combination, make sure the derailleur handles the largest sprocket cleanly, and verify shifting under load. Sorting this in the driveway is far cheaper than discovering it on a 2,000-metre day.

Summary

• Length: 14.4 km
• Average gradient: 8.45%
• Net elevation gain: 1,217 m
• Total ascent: 2,239 m
• Category: HC

Passo Tanarello is defined by the gap between its net gain and its total ascent. Respect the undulation, pace to effort, gear for the steep, and this HC climb rewards a rider who plans rather than one who simply pushes.