Observed arrival · 2026-10-11
Rim Reader measures wheel alignment with a phone and printed bracket
Rim Reader is an Android app in testing that aims to check wheel alignment at home using a phone’s gyroscope and a 3D-printed bracket.
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- For
- DIY car owners checking alignment after repairs
- Worth noticing
- The site says each wheel is read twice to measure gyro drift, and reports a typical front-total-toe variation of 0.026° between laps.
Field notes
The described setup requires an Android 10-or-newer phone with a gyroscope, a PETG bracket and wedge, wheel chocks, and level, firm ground. Calibration uses a wall, tape, and a pen; the site says readings work offline and remain on the phone. Its sample-report section explicitly labels the numbers as made up, and the app is still described as in testing.
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Editorial observations of this landing page, not a rating.
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