See what supports the guidance—and what does not.

Published research, Roth policy, and rider outcomes are different things

Published research can support a measurement convention or a comparison in a defined group. Roth product policy decides how the service handles uncertainty and what it will or will not suggest. Rider outcomes describe what happened after a specific rider tried a specific change. One layer does not prove the others.

• Research stays tied to the method and population studied
• Roth-specific rules are labeled as product policy
• Individual results are not generalized without suitable evidence
• Optional rider feedback is separate from free fit access

Similarly named angles are not automatically interchangeable

A knee angle measured while the rider is still is not the same observation as a knee angle measured while pedaling. Pedal-bottom and greatest-extension moments can also differ. Camera position, landmark definitions, equipment, and the statistic used across a pedal cycle all affect the number.

Roth only connects a published comparison to a reported value when those details match closely enough to say what is being compared. Otherwise the source remains background, not a target.

The public record should say when evidence is missing

Roth has not established that its service improves cycling performance, prevents injury, diagnoses a condition, or guarantees comfort. Published outcomes from another fitting method or rider group do not prove a Roth outcome.

The current responsible use is narrower: collect a repeatable view, explain what can be observed, propose only a supported and reversible next step, and stop when the video, bike, or rider question needs in-person judgment.

A source link is not a badge of certainty. The useful part is the exact claim, method, population, and limitation that travel with it.

Every guide should be easy to check and easy to correct

Roth guides lead with a plain-language answer, show a visible review date, name the company responsible for the page, and link the research used. Material corrections should update the page date and preserve the same canonical URL whenever possible.

Questions about a source, wording, or correction can be sent to hello@rothbikefit.com. Product and service claims are updated separately from general educational guidance so a future feature is not described as available before it is live.