Kloof Nek

Overview

Kloof Nek is a Category 3 climb in South Africa, running 5 km from the coast to its saddle. It starts at sea level, 0 m, and tops out at 248 m, giving a net elevation gain of 248 m. At an average gradient of 4.93%, it sits in the range where a strong rider can hold tempo the whole way, but the climb is not evenly graded, so the number on paper undersells the sharper efforts you will meet en route.

The give-away is the gap between net gain and total ascent. You climb 248 m net, but the total ascent is 259 m — an extra 11 m of climbing that only exists because the road pitches down and back up along the way. That undulation means you pay for short descents by re-climbing them, so the metabolic cost is slightly higher than a clean 248 m drag would suggest, and your rhythm will be broken more than once.

How the Gradient Unfolds

The 4.93% average is a blend, not a constant. It hides both softer stretches where the road eases off and a hard maximum of 12.52%, where the gradient more than doubles the average. Read the profile as a series of pitches rather than a single ramp, and time your hardest efforts for the steep sections rather than burning matches on the flatter ground.

• Flatter or recovery sections where you can shift up, breathe, and reset before the next kick
• Short repeated climbs stacked back to back, each demanding a fresh surge — this is where the extra 11 m of total ascent lives
• The steepest ramp at 12.52%, the pitch that dictates your lowest gear and your pacing ceiling

Pacing Notes

On an undulating climb like this, chase even effort, not even speed. Holding a fixed km/h forces you to spike power on every rise and coast on every dip, which wastes energy on a profile with this much broken ground. Instead, anchor your ride to a target sustainable power output and let your speed float — faster on the recovery sections, slower and steadier on the 12.52% ramp. Before you go, run the numbers through the FTP estimator so your target zone reflects your current form, not last season's.

Gearing

Your gearing is governed by the steepest pitch, not the average. To spin the 12.52% ramp without grinding, run a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 gives you the low end to keep a smooth cadence when the road bites. Check your setup before the ride: confirm the rear derailleur handles your largest sprocket and that shifting is clean, because discovering you are over-geared mid-ramp is a bad place to run out of options.

Summary

• Length: 5 km
• Average gradient: 4.93%
• Maximum gradient: 12.52%
• Net elevation gain: 248 m
• Total ascent: 259 m
• Category: 3

Kloof Nek is a short, honest Category 3 test: 5 km, 248 m of net gain from sea level, with an undulating profile and a 12.52% sting. Pace it by effort, gear for the steep pitch, and the average will take care of itself.