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Question : Is it the rear brake on the Marin ? If the hubs don't move, perhaps the chainstays do. That rear end looks like the kind of setup that could have some flex along the longitudinal axis. In that case the entire brake mount and caliper would be able to rotate outward or inward a bit, causing the disc to drag when riding. In your workstand you don't get those forces.
If it only just started to happen, perhaps you might want to look at the suspension linkage system first. If there's play in the bushings or if one of the bolts is getting a bit loose, that could weaken the front end of the rear section enough to make the entire thing flex a few millimeters. That's enough to cause this phenomenon.
If it only just started to happen, perhaps you might want to look at the suspension linkage system first. If there's play in the bushings or if one of the bolts is getting a bit loose, that could weaken the front end of the rear section enough to make the entire thing flex a few millimeters. That's enough to cause this phenomenon.
