Otto Du Plessis Pass

Overview

Otto Du Plessis Pass is a Category 2 climb in South Africa (ZA), running 5.3 km from a base at 1424 m to a summit of 1766 m. On paper it is a mid-length effort: 342 m of net elevation gain at an average gradient of 6.46%. That places it firmly in the range where a climb is long enough to matter to your ride but short enough to attack with intent rather than survive.

The number worth flagging is the gap between net gain and total ascent. You climb 342 m net, but you actually ascend 427 m — an 85 m difference. That means roughly 85 m of descending or false-flat give-back is stitched into the pass, so you re-climb the same ground twice. The road is not a clean, single ramp; it undulates, and every metre you drop is a metre you have to earn back. Budget accordingly.

How the Gradient Unfolds

The 6.46% average is an accountant's number — it smooths over the reality. With 85 m of hidden descent baked into the profile, the pitches that actually carry you upward are steeper than 6.46%, because the flatter and downhill sections drag the mean down. Expect the effort to arrive in punches rather than one steady grind.

• Flatter or recovery sections and short descents where you can spin, refuel, and reset your legs
• Repeated short climbs that stack up, each one steeper than the average implies
• A steepest ramp that bites hard and rewards riders who have kept something in reserve

Pacing Notes

On a smooth, even climb you would hold steady watts and let speed vary. Otto Du Plessis Pass is not that climb. Its undulation makes pure even-effort pacing tricky, because coasting a descent at target power is impossible. Aim for even effort on the climbing pitches — settle into your sustainable power output and hold it through the ramps — but ease off and recover on the descents and flats rather than hammering to keep speed constant. Chasing even speed here burns matches you will want for the steep sections. If you do not know your ceiling, run the FTP estimator first and set a realistic climbing target.

Gearing

The pitches are steep enough that gearing is not optional insurance — it is the difference between spinning and grinding to a stall. Run a compact (50/34) or sub-compact chainset paired with a wide-range cassette. A 34×32 gives you a genuine bailout gear; a 34×34 gives more, and on a lumpy pass with punchy ramps that extra cog is cheap insurance. Check your setup before the ride — confirm the chain shifts cleanly into your lowest gear at the workstand, not halfway up the steepest ramp.

Summary

• Length: 5.3 km
• Average gradient: 6.46%
• Net elevation gain: 342 m
• Total ascent: 427 m
• Category: 2

Otto Du Plessis Pass is a manageable Category 2 that punishes riders who trust the average. Respect the 85 m of hidden re-climbing, gear low, pace the ramps on effort, and it becomes a climb you ride well rather than merely finish.