Rengg Pass

Overview

Rengg Pass is a category 2 climb in Switzerland, running 7.8 km from a start elevation of 546 m to a summit at 964 m. Across that distance it delivers a net elevation gain of 418 m, which sets the tone: this is a mid-length effort where the numbers stay honest but the terrain does not sit still. The average gradient of 5.35% places it firmly in tempo territory rather than out-and-out survival mode.

That said, the net gain does not tell the whole story. The total ascent is 514 m — 96 m more than the net figure. That gap is undulation: sections that dip or flatten before climbing again, forcing you to reclimb ground you have already covered. Every one of those 96 extra metres is real work your legs will feel, even though the map only credits you with 418 m from bottom to top.

How the Gradient Unfolds

A 5.35% average on a climb with this much undulation is misleading. The gradient is not spread evenly — the flatter and downhill sections drag the mean down, which means the climbing pitches are steeper than 5.35% to compensate. Expect the effort to arrive in pulses rather than as one steady wall.

• Flatter or recovery sections where the road eases and briefly gives back elevation
• Repeated short climbs that follow those dips, each one asking you to accelerate again
• The steepest ramp, considerably above the average, where you will be out of the saddle or grinding a low gear

Pacing Notes

On an undulating climb like Rengg Pass, chase even effort, not even speed. Riding to a target sustainable power output keeps you steady through the dips and the steep ramps alike, whereas holding a fixed speed will spike your power on every pitch and waste matches on the flatter sections. Let your speed rise on the recovery stretches and hold your wattage constant when the road tilts up. If you do not know your ceiling, run the numbers through the FTP estimator before you go, and set your climbing target a notch below it so the repeated surges do not cook you before the summit.

Gearing

The steepest ramp governs your gearing, and on a climb this punchy that means giving yourself room to spin. Fit a compact or sub-compact chainset and pair it with a wide-range cassette — a 34×32 or 34×34 will let you keep cadence up where the gradient bites hardest instead of mashing a gear you cannot turn. Check your setup before the ride, not at the bottom of the first steep pitch.

Summary

• Length: 7.8 km
• Average gradient: 5.35%
• Maximum gradient: 21.63%
• Net elevation gain: 418 m
• Total ascent: 514 m
• Category: 2

Rengg Pass rewards riders who respect its undulation. Pace to power, gear low for the ramps, and treat the 96 m of hidden climbing as part of the job rather than a surprise.