A useful stop is a result.

Bike-fit guidance with clear medical boundaries.

Roth provides guided online bike fitting for supported riders and bikes. It does not diagnose or treat medical conditions. Stop riding for worsening symptoms or reduced control, and contact a qualified healthcare professional for medical concerns.

Do not use Roth to decide whether an injury is safe to ride with, to interpret a medical condition, or to continue riding through a worsening signal.

Worsening symptoms or loss of control means stop.

Roth is designed to stop when the answer is uncertain. A stop result keeps your current information and points you toward the right kind of help without trying to diagnose you.

• Worsening pain, numbness, weakness, or another warning sign
• Loss of bike control, dizziness, or inability to complete the check
• Two recordings that do not agree or video that is not clear enough
• A suggested change that cannot be made safely on the bike
• Anything outside the supported riders, bikes, or adjustments

The component manufacturer sets the hard limits.

Every bike part has a safe range and a required tightening force. A suggestion cannot override the minimum-insertion line on a seatpost, clamp or saddle-rail markings, instructions for carbon parts, the manufacturer’s bolt-tightening number, or any other stated limit.

• Record the starting measurement and setup photo
• Use the correct tools and current manufacturer instructions
• Do not improvise beyond marked ranges or component limits
• Choose a mechanic or fitter whenever the change is uncertain

Video can be rejected—and that is useful.

A flat phone video cannot show every cause, movement, or bike detail. Roth stops when the full rider is not in view, the camera moves, important areas are hidden, the picture is unclear, or the two side recordings do not agree.

• No claim that a flat phone video can show depth
• No shoe-cleat changes or medical diagnosis in the first version
• No single score that is supposed to fit everyone
• No guidance after a rider, safety, video-quality, or comparison check fails

Know which professional to contact.

A qualified bike fitter can assess complex position and equipment questions in person. A mechanic should handle uncertain or unsupported component work. A qualified healthcare professional is the right next step for health concerns, diagnosis, treatment, or worsening symptoms.