Sychnant Pass

Overview

Sychnant Pass is a Category 4 road climb in North Wales, running 4.2 km from sea level to a summit elevation of 137 m. The net elevation gain sits at 137 m, but total ascent across the full profile reaches 195 m — meaning the road undulates enough that you climb more than the straight-line numbers suggest. That 58 m difference between net and total ascent is worth noting: what looks like a gentle warmup effort on paper has some genuine ups and downs built in.

Gradient Profile

The average gradient of 3.26% is firmly in the "steady tempo" range — nothing that should force a gear change panic on its own. The max gradient of 10.74%, however, tells a different story. Somewhere on this climb the road tips up sharply, roughly three times the average steepness. Riders who pace purely off the overall average will find themselves caught out when that ramp arrives.

The general shape of the climb follows a pattern common to Welsh mountain passes: a relatively manageable lower section that lulls you into a rhythm, followed by a tighter, steeper push as the road squeezes through higher ground toward the summit.

Key Gradient Checkpoints

• Lower slopes: Expect gradients well below the 3.26% average — use this section to settle into a sustainable cadence rather than pushing hard early.
• Mid-climb: Gradient begins to increase. Watch your power or perceived effort; this is where many riders start to drift above target.
• Upper ramp: The road reaches its maximum of 10.74% somewhere before the summit. Shift down before you need to, not after momentum has already bled away.

Pacing Notes

For a Category 4 climb with a 3.26% average, most trained riders will spend the majority of their time here at or just below threshold. The temptation is to treat it as a recovery climb — the low average gradient encourages that — but the 195 m total ascent and the 10.74% peak mean you need to hold something back.

A useful approach: target a power output around 85–90% of your FTP from the base, then allow yourself to push into threshold territory only once you can see the summit. If you don't know your FTP, use the FTP estimator before attempting to structure your effort.

Gearing Recommendations

For riders on compact or mid-compact chainsets, a 28t or 30t cassette sprocket gives comfortable headroom for the steeper sections without over-gearing the flatter approach. Riders running standard 53/39 chainsets should ensure they have at least a 28t available — the 10.74% maximum will expose any gearing deficit quickly, particularly if legs are already loaded from preceding mileage.

Cadence is the key variable. Aim to keep it above 80 rpm throughout. Grinding a big gear through the steep ramp costs far more than a momentary shift to an easier cog.

Descent Considerations

The return descent from 137 m back to sea level is fast and compact. Wet Welsh road surfaces are a constant possibility; brake early into any blind bends and treat the descent with more respect than the short elevation profile might suggest.

Context Within a Wider Route

Sychnant Pass sits in a region rich in cycling terrain. Used as part of a longer loop — combined with coastal roads around the Conwy estuary or linked into the hills above Penmaenmawr — it functions well as either an opening climb to wake the legs or a final sting in the tail. As a standalone effort, it rewards repeated attempts: the short length makes it ideal for structured interval work targeting sub-threshold and threshold zones.