Sigma
Sigma ROX 12.1 Evo
$379.95
Released 2023-06
Best Bike Computers · head-to-head
Sigma ROX 12.1 Evo vs Coros Dura
A sourced, side-by-side comparison. Coros Dura is cheaper at $249. Every spec and price links to its source.
Coros
Coros Dura
$249Cheaper
Which is better: the Sigma ROX 12.1 Evo or Coros Dura?
The Coros Dura wins 1 of the 1 specs we compare head to head; the other wins 0. The Coros Dura is the cheaper at $249. The Coros Dura both leads on specs and costs less — the straightforward pick.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Sigma ROX 12.1 Evo | Coros Dura |
|---|---|---|
| US price | $379.95 MSRP, basic set (device + mount) | $249 |
| Brand | Sigma | Coros |
| Released | 2023-06 | — |
| Display size (in) | 3.0 in | 2.7 in |
| Touchscreen | Yes | Yes |
| Battery life hours | 14 | 120 |
| Preloaded maps | Yes | Yes |
| Multiband gnss | No | Yes |
| Connectivity | ANT+, Bluetooth, Wi-Fi | ANT+, Bluetooth, Wi-Fi |
| Weight (g) | 112 | 102 |
| Release | 2023-06 | — |
Sources — Sigma ROX 12.1 Evo: sigma.bike (verified 2026-06-19). Coros Dura: coros.com (verified 2026-07-10).
What's the difference between the Sigma ROX 12.1 Evo and Coros Dura?
Where the two actually differ on the specs we track (4 of 7). Matching specs are omitted.
- Display size (in): Sigma ROX 12.1 Evo 3.0 in vs Coros Dura 2.7 in
- Battery life hours: Sigma ROX 12.1 Evo 14 vs Coros Dura 120
- Multiband gnss: Sigma ROX 12.1 Evo false vs Coros Dura true
- Weight (g): Sigma ROX 12.1 Evo 112 vs Coros Dura 102
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Sigma ROX 12.1 Evo
Only one whitelisted tester (BikeRadar) published a hands-on review of this exact model. BikeRadar rated it 2/5, praising easy route-following and rich training data but panning meagre battery life (10h with a heart rate monitor only; 4.5h navigating with sensors), a rain-triggered touchscreen, cheap build and an uncompetitive £379.95 price. (1 sourced review, 1 lab-tested.)
Praised: Easy-to-follow turn-by-turn navigation and clear routing; Data-rich training metrics with a capable companion app.
Flagged: Meagre battery life, far below the claimed 14 hours; Touchscreen misbehaves in rain, skipping pages and changing settings; Uncompetitive £379.95 price versus Garmin/Wahoo rivals.
Coros Dura
Genuine verdict: two whitelisted outlets — Cycling Weekly's 7-month review and DC Rainmaker (a 2024 pre-release hands-on plus a 2026 measured battery test) — agree the Dura's standout is class-leading solar battery life at a low $249 price, undercut by bare-bones mapping and unreliable, app-dependent rerouting. Non-whitelisted bike sites like BikeRadar and Velo were excluded. (3 sourced reviews, 3 lab-tested.)
Praised: Class-leading solar battery life: 100+ real-world riding hours; ~2%/hour burn, ~156h projected with solar gains; Low $249/GBP249 price and strong overall value; Sleek, lightweight build with near-instant startup and an easy-to-use interface/app.
Flagged: Unreliable rerouting: no on-device rerouting, depends on phone app plus cell signal, and failed repeatedly even with connectivity; Bare-bones mapping: no street names, POIs, or distinction between roads, gravel and dead-ends; Slow-to-respond touchscreen, especially zooming the map.