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Join Date: May 2023
Location: Big Sur California
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Bikes: 1946 Holdsworth Cyclone, 1969 Cinelli SC, 1972 Raleigh Pro, 1973 Merz road bike, 1974 Alex Singer Sportif, 1974 Merz track bike, 1975 Teledyne Titan, 1976 Ritchey road bike, 1977 DiNucci built Merz track bike, 1977 (?) Exxon Graftek, many more!
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This is what I found about external vibration affecting a mechanical watch:
WEARING AN AUTOMATIC WATCH ON A MOTORCYCLE OR BICYCLE
An automatic watch consists of a multitude of parts that are vulnerable to strong vibrations. The vibrations of a motorcycle engine or the bad condition of a road can damage the movement of the watch. However, this phenomenon is rather rare and generally does not lead to serious malfunctions. Using a bicycle is much less risky because the watch is only exposed to road conditions. It is nevertheless possible to control the impact of your trips on your watch by monitoring the case of a possible drift. As a general rule, we recommend that you have your automatic watch serviced every 7 years to ensure that it is functioning properly. However, if you ride a two-wheeler for your daily commute, we recommend that you drop your watch off for a service every 5 years or so.
There is the risk of serious damage from a crash, road rash on a nice watch would not be desirable. Jim Merz