What Gearing Do You Need for Atlas Gravel?

Atlas gravel is climbing country. The passes are long and steady rather than brutally steep, but a week of 1,000-metre-plus days on compacted earth will find any gearing that is too tall. The right low gear is the difference between spinning to the pass and grinding it. Here is how to choose.

The climbs you are gearing for

The benchmark climbs are Tizi n’Tichka at 2,268 m and Tizi n’Test at around 2,092 m — both long, steady ascents on mixed gravel and tarmac. The Atlas to Sahara Grand Tour stacks 8,200 m of climbing over 12 days. The gradients are mostly 4–7%, with short ramps over 10% on the pass approaches.

The low gear

You want a lowest gear at or below 1:1 — one revolution of the crank for one revolution of the wheel. For a 1× setup, a 40 or 42t chainring with a 10–51 cassette gives a 0.78–0.82 low ratio. For 2×, a 46/30 sub-compact with an 11–34 cassette gives a 0.88 low ratio. Lower is better for loaded days and back-to-back climbing.

1× vs 2×

1× is simpler — one shifter, no front derailleur, less to go wrong in dust — and a 10–51 cassette gives a wide enough range with a low enough bottom gear. The trade-off is bigger jumps between gears. 2× sub-compact gives tighter jumps, which some riders prefer for finding a rhythm on long climbs. Both work; pick the one you already ride.

Loaded vs supported

If you are bikepacking — carrying water, gear and food — go lower. A 40t × 10–51 is the safer call. On a supported tour where you ride light, a 42t × 10–51 or a 46/30 × 11–34 is plenty. Read the bike setup guide.

Frequently asked questions

What low gear do I need for Atlas gravel?

A sub-1:1 low gear — at or below one crank revolution per wheel revolution. A 1× 42t × 10–51 (low ~0.82) or a 2× 46/30 × 11–34 (low ~0.88) gets you up Tizi n’Tichka and Tizi n’Test comfortably.

Is 1× or 2× better for Morocco?

Both work. 1× is simpler and more robust in dust, with bigger gear jumps. 2× sub-compact gives tighter jumps for rhythm on long climbs. Pick the one you already ride.

Do I need a 10–51 cassette?

For 1×, yes — it gives the low gear for the passes. For 2× sub-compact, an 11–34 or 11–36 is enough. A standard compact (50/34) is too tall for loaded Atlas days.

Does gearing matter on a supported tour?

Yes, but less. Riding light, a 42t × 10–51 or 46/30 × 11–34 is plenty. Bikepacking loaded, go lower — a 40t × 10–51 is the safer call.