Cairnwell Pass

Overview

Cairnwell Pass is a Category 4 climb in Great Britain, running 6.2 km from a start elevation of 407 m to a summit at 649 m. Over that distance it delivers a net elevation gain of 242 m at an average gradient of 3.9%. That places it firmly in the range where a strong rider can hold a steady rhythm from bottom to top without ever being forced out of the saddle for long.

Look closer, though, and the numbers tell you the road does not climb cleanly. The total ascent is 255 m against a net gain of 242 m, meaning roughly 13 m of the road actually points downhill before climbing again. That gap is small, but it confirms the profile undulates rather than rising in one continuous grade. Each dip you coast into is height you then have to earn back, so the effort is a touch spikier than the tidy 3.9% average implies.

How the Gradient Unfolds

An average of 3.9% is the great flattener: it blends the recovery sections and the pinches into a single unremarkable figure. The steepest recorded pitch here reaches 8.42%, more than double the average, and that is the section that will define how the climb feels.

• Flatter, near-flat, and briefly descending sections where you can recover and carry speed
• Repeated short rises that chip away at your legs rather than one long sustained wall
• A steepest ramp around 8.42% that demands a gear change and a short, deliberate surge

Pacing Notes

On an undulating climb like this, chasing an even speed is a trap: you burn matches fighting the 8.42% ramp to hold your flat-section pace, then coast the descents where that effort is wasted. Instead, pace to even effort. Settle into a target you can hold based on your sustainable power output, ease slightly on the flat and downhill breaks, and let the steep pitches pull your effort up only as far as your rhythm allows. If you do not know that ceiling yet, run the FTP estimator before you build a pacing plan around it. The short length means you can afford to push closer to threshold than on a long alpine climb.

Gearing

The 8.42% maximum is the number that should govern your setup. It is manageable but steep enough that an undersized gear will force you into a grind on the ramp. Fit a compact or sub-compact chainset paired with a wide-range cassette, something like a 34×32 or 34×34, so you keep cadence over the steepest pitch without wrenching on the pedals. Check your chainset and cassette before you ride rather than discovering a hard gear halfway up.

Summary

• Length: 6.2 km
• Average gradient: 3.9%
• Maximum gradient: 8.42%
• Net elevation gain: 242 m
• Total ascent: 255 m
• Category: 4

Cairnwell Pass rewards discipline over aggression: pace to effort, gear for the 8.42% ramp, and treat the short descents as recovery rather than lost time. Do that and this Category 4 climb rides well within reach.