Brook's Nek

Overview

Brook's Nek is a Category 2 climb in South Africa (ZA), running 7.6 km from base to summit. It gains 396 m of net elevation, starting at 1,218 m and topping out at 1,614 m. That places it firmly in the middle-distance category: long enough to demand real pacing discipline, short enough that you can commit to a sustained effort rather than settling in for an hour of survival.

The headline net gain of 396 m understates the work. Total ascent measures 605 m, meaning you climb roughly 209 m more than the raw start-to-summit figure suggests. That gap is undulation: the road repeatedly gives back altitude before clawing it back again. Every descent or false flat you enjoy is elevation you have to re-earn, so the effort ledger is heavier than the net number implies. Treat this as a 605 m climb, not a 396 m one.

How the Gradient Unfolds

The 5.22% average is a blend, not a constant. Undulation of this scale means the road swings well above and below that figure, and the average masks both the recovery dips and the sharp kicks. The steepest recorded pitch bites at 15.3%, roughly three times the average, so there is at least one ramp that will force you out of rhythm.

• Flatter and recovery sections where the grade drops well below 5% or tips slightly downhill
• Repeated short climbs that regain the altitude lost on each dip
• A steepest ramp near 15.3% that demands your lowest gear and a deliberate change of pace

Pacing Notes

On an undulating climb, even-speed pacing is a trap: holding a fixed speed spikes your power on every steep pitch and burns matches you cannot afford. Aim instead for even effort, letting your speed rise on the shallow sections and fall on the ramps while your power stays anchored near your sustainable power output. Push slightly above threshold only on the steepest kicks, then recover on the descents and false flats the undulation hands back to you.

If you do not know your threshold, calibrate it first with the FTP estimator so your target is a real number rather than a guess. On a climb with 605 m of total ascent, going out too hard in the first third is the most common way to blow up before the summit.

Gearing

The 15.3% maximum dictates your setup. Gear for the steepest ramp, not the average, so bring a compact (50/34) or sub-compact chainset paired with a wide-range cassette. A 34×32 or 34×34 low gear lets you spin the 15.3% pitch without grinding to a stall. Check your chainring and cassette before you ride: swapping a cassette at the trailhead is not an option, and the wrong low gear turns a manageable ramp into a walk.

Summary

• Length: 7.6 km
• Average gradient: 5.22%
• Maximum gradient: 15.3%
• Net elevation gain: 396 m
• Total ascent: 605 m
• Category: 2

Brook's Nek rewards riders who respect the undulation. Pace to power, gear for the steepest ramp, and remember that the 605 m of total ascent — not the 396 m net — is the effort you are actually signing up for.