Three weeks ago, I had the wheels balanced on my truck. At that time, I marked the location of the tire relative to the rim, so I could measure "creep", or how much the tire moves on the rim. Creep is one reason that wheels require periodic re-balancing.
In three weeks and ~600 miles of driving, the tire has moved almost 1/4 inch forward. This is a shot of the right-rear wheel, so you can see the effect of tire creep.
One must assume that bicycle tires do the same. However, I'm sure it's well within the margin of error. I only mention it for academic purposes.
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