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Wow, there are so many cracks. They don't make 'em like they used to...? LOL Wonder if he's got tubes in them!
As long as he doesn't exceed 30 mph, never hits a pothole or has anyone cut him off (requiring emergency braking) I guess he can ride on those bricks until they finally get ground down to powder and steel braids.
Of course there are tubes in them, an 80's spoke rim. Tube is probably not in a ton better shape but at least does not see the UV degradation. Seen some 3rd world country riders take tires past even those extremes, caveat is they usually go pop at slow speeds and not too dramatically.