Hammerhead
Hammerhead Karoo 3
$524.99
Released 2024-05
Best Bike Computers · head-to-head
Hammerhead Karoo 3 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 Hammerhead Karoo 3 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 | Hammerhead Karoo 3 | Coros Dura |
|---|---|---|
| US price | $524.99 | $249 |
| Brand | Hammerhead | Coros |
| Released | 2024-05 | — |
| Display size (in) | 3.2 in | 2.7 in |
| Touchscreen | Yes | Yes |
| Battery life hours | 15 | 120 |
| Preloaded maps | Yes | Yes |
| Multiband gnss | Yes | Yes |
| Connectivity | ANT+, Bluetooth, Wi-Fi | ANT+, Bluetooth, Wi-Fi |
| Weight (g) | 118 | 102 |
| Release | 2024-05 | — |
Sources — Hammerhead Karoo 3: shop.sram.com (verified 2026-06-19). Coros Dura: coros.com (verified 2026-07-10).
What's the difference between the Hammerhead Karoo 3 and Coros Dura?
Where the two actually differ on the specs we track (3 of 7). Matching specs are omitted.
- Display size (in): Hammerhead Karoo 3 3.2 in vs Coros Dura 2.7 in
- Battery life hours: Hammerhead Karoo 3 15 vs Coros Dura 120
- Weight (g): Hammerhead Karoo 3 118 vs Coros Dura 102
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Hammerhead Karoo 3
Both whitelisted testers reviewed the Karoo 3. DC Rainmaker ran multi-month, side-by-side testing against the Garmin Edge 840 and Wahoo ROAM V2 (GPS/elevation data plots, battery-burn charts). Cycling Weekly did a hands-on but qualitative test on a Morocco ride, with no measured metrics. Both praise navigation and user-friendliness and call it a legitimate Garmin/Wahoo rival. Both note it is not meaningfully faster / slow to power up despite the new processor and RAM. On battery they diverge: Cycling Weekly found the 15+hr claim falls short in real use, while DC Rainmaker found the claimed ~30% improvement roughly holds (about 12-13hr realistic). No RTINGS or lab-benchmark source exists for this model. (2 sourced reviews, 2 lab-tested.)
Praised: Class-leading mapping and navigation (best-in-class per CW; top-2 and a core strength per DCR); Superior high-resolution 3.2-inch display; Standout user-friendliness and setup.
Flagged: Not meaningfully faster / slow to power up despite the new processor and RAM; Battery life is the weak point vs Garmin/Wahoo (15+hr claim fell short in real use); Weak structured-workout player / interface needs improvement.
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.