Sports Watch for a Cyclist — Garmin, COROS or Apple Watch?
A sports watch on a cyclist's wrist isn't obvious — after all, your training data already shows up on your head unit. But a watch does a few things a head unit can't: it measures heart rate without a chest strap, tracks sleep and recovery, and works off the bike too. Is it worth it?
What does a watch give a cyclist?
- Wrist-based heart rate — no need to wear a chest strap. Accuracy depends on the model: the best optical sensors (Garmin Elevate v5, Apple Watch) come close to a strap, but during hard intervals they can lag by a few seconds.
- Recovery tracking — HRV (heart-rate variability), sleep quality, Body Battery / Training Readiness. Data your bike computer doesn't collect.
- GPS as a backup — if your head unit's battery dies, the watch records the route.
- Multisport — running, swimming, the gym — one watch instead of three devices.
Comparing platforms
| Criterion | Garmin | COROS | Apple Watch |
|---|---|---|---|
| Battery (GPS) | 20–60 h | 25–70 h | 6–12 h |
| Heart-rate sensor | Very good | Good | Very good |
| Cycling ecosystem | Full (Connect, Edge) | Good (COROS app) | Limited |
| ANT+ sensors | Yes | Yes | No (Bluetooth only) |
| On-watch navigation | Maps (Fenix/Enduro) | Breadcrumb trail | Limited |
| Price | €190–950 | €140–580 | €420–820 |
Garmin — an ecosystem for cyclists
If you have a Garmin Edge head unit, a Garmin watch (Forerunner, Fenix, Enduro) forms one coherent ecosystem with it. Data from both devices lands in Garmin Connect, which builds a combined analytics picture: training load, VO2max, Training Readiness. That's the biggest advantage — everything in one place.
Models for cyclists: Forerunner 265/965 (good value), Fenix 8 (premium, long battery life, maps).
COROS — price and battery life
COROS offers very good battery life at a lower price than Garmin. The PACE 3, at around €140, is a great training watch with 38 hours of GPS. Its ecosystem is younger but developing fast. No compatibility with Garmin bike computers — data stays in the COROS app.
Apple Watch — smart, but short battery life
The Apple Watch is the best smartwatch, but a weaker sports watch. Its 6–12 h of GPS battery life isn't enough for longer rides. No ANT+ means no compatibility with many power meters and bike sensors. In return, it has the best iPhone integration, notifications, and Apple Health.
Who it's for: occasional cyclists who want a smartwatch with a sports feature, not the other way round.
Watch vs. chest strap
For training with TSS and zones, a chest strap is still more accurate, especially during intervals. A watch works well for round-the-clock monitoring (resting heart rate, HRV, sleep) and as a GPS backup. Ideally: a strap for training, a watch for the rest of the day.
Summary
A sports watch makes sense for a cyclist as a recovery and health-monitoring tool — not as a head-unit replacement. Garmin, if you have an Edge and want one ecosystem. COROS, if battery life and price are your priority. Apple Watch, if you're primarily an iPhone user and cycling is a side interest.
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