FTP is just a number. There's more to you.

Raceproof measures the time and the power of seven thresholds, including the one FTP estimates.

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FTP is an estimate of one threshold.

There are several ways to calculate it.

Three methods. Three numbers, W apart.

Each one assumes your best effort was a test, and keeps only its power.

PT-T is the same threshold, measured without a test.

A Power and a Time Offset, how long the threshold lasts: at .

And it is one of seven.

Six more thresholds, measured the same way.

Seven Seats, from the riding you already record.

Together they are the Power Threshold Array: seven thresholds, each with a Power and a Time Offset.

20-MIN TEST0.95 × best 20 min333.6 W→ 316.9 W
8-MIN TEST0.90 × best 8 min380.1 W→ 342.1 W
CRITICAL POWERfrom best 3 min and 12 min347.3 W · 453.4 W→ 311.9 W
PT-N4.4 s1,488 W
PT-S17.2 s1,267 W
PT-G37.6 s895 W
PT-X1:05.1713 W
PT-O2:11.2521 W
PT-V3:31.7481 W
PT-T19:52.9361 W
1 s1 min60 min20 min5 s30 s3 min8 min15 s12 min
LENGTH · TIME OFFSET, LOG SCALETHICKNESS · POWER

On June 14, 2020, one rider’s threshold was measured four ways.

Three estimates of FTP, from his best efforts. And Raceproof PT-T: the same threshold, with Raceproof’s proprietary Time Offset, how long that threshold lasts.

By November 17, 2020, all three FTP estimates had fallen.

After five months of hard training, all three FTP estimates fell, but PT-T Power stayed within 1%.

Five months of hard training should not lower FTP. It often does, and it did here: 13 W, 4 W and 22 W. PT-T Power stayed within 1%, which fits the training he did.

So was he losing fitness?

Or was FTP the wrong performance metric?

Introducing Raceproof Time Offset: a fatigue-resistance metric that, like Power, is measured for every threshold. Power is its watts; Time Offset is how long it lasts.

By November 17, 2020, his PT-T Seat lasted 2:46 longer at the same Power.

Time Offset 19:06, up from 16:20. PT-T Power 392 W, within 1% of June.

Over five months of hard training, his threshold Power did not rise. The time he could sustain it rose 2 minutes 46 seconds.

FTP said he lost up to 22 W. Raceproof showed a truer picture.

Though his Power did not increase, PT-T shows a meaningful fitness gain: its Time Offset grew 2:46 at nearly the same Power.

Gains have always meant more Power at a fixed time. Raceproof also shows the inverse: more time at the same Power.

On June 14, 2020, his PT-T Seat was one point.

16:19.9 at 394.8 W: a Time Offset across, a Power up.

Every ride moved it a little.

Over the next 135 rides it moved 2:45.8 to the right, at the same Power.

Eight years. No test.

Each dot is one day of his PT-T Seat, set by all the riding before it, never by one effort.

Every Seat is found the same way.

Seven clouds, from the same eight years of riding.

Seven Seats, found in the riding you already record.

You never take a test.

Find your seven Seats.

FOR RIDERSYour Seats, from the riding you already record.Connect Strava or Garmin, or upload FIT files.JOIN THE WAITLIST
FOR COACHES AND TEAMSFourteen coordinates per rider, where FTP gives you one.TELL US YOU'RE INTERESTED
FOR RESEARCHERS AND PRESSA new measurement model for cycling, and the research behind it.[email protected] →