AI quick summary
- The 20-minute test is the gold standard but brutal; the ramp test is easiest but can overestimate for some.
- Your FTP only matters as the anchor for your training zones — pick the test you'll actually repeat.
- Re-test every 4–6 weeks under similar rested conditions.
/ 01
Why your FTP matters
Functional Threshold Power is the highest wattage you can sustain for roughly an hour, and it's the anchor that sets all your training zones. Get it roughly right and your intervals land in the right place; get it wrong and every structured session is off-target.
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The three tests compared
Pick by your experience and how often you'll re-test.
| Test | What it is | Effort | Best for |
|---|---|---|---|
| 20-minute | Go all-out for 20 min, take 95% as FTP | Very hard, painful | Gold standard; experienced riders |
| Ramp | Watts rise each minute until failure | Progressive, ends hard | Beginners; easy to repeat |
| 2×8-minute | Two 8-min efforts, averaged | Hard, two rounds | Time-crunched; less fatiguing |
/ 03
20-minute test
The classic. Ride 20 minutes as hard as you can evenly sustain and take 95% as your FTP. It's accurate when done well, but pacing is a skill — go out too hard and you blow, too easy and you under-test. It also wrecks you for a couple of days.
/ 04
Ramp test
Resistance climbs a fixed amount every minute until you can't turn the pedals. It's the easiest to execute and the least mentally taxing, which is why platforms default to it. Caveat: because it's a short, anaerobic-flavored effort, it can overestimate FTP for strong sprinters and underestimate it for diesel-engine time-trialists.
/ 05
8-minute (2×8) test
Two 8-minute efforts with a recovery gap, averaged and scaled. A middle ground: shorter and less exhausting than the 20-minute test, more aerobic than the ramp. Popular for riders who want repeatable results without the full 20-minute suffering.
/ 06
Which to use
Newer to power? Start with the ramp test for consistency. Want accuracy and can pace? The 20-minute. Short on time or fried from training? The 2×8. Whatever you pick, re-test every 4–6 weeks, similarly rested, so your zones track your real fitness.
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