Joined: Nov 2006
Posts: 19,810
Likes: 597
From: NJ, NYC, LI
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
I would not worry about the wheel collapsing. I would worry about the tire blowing off. A fully inflated tire puts a lot of sideways pressure on the rim walls, and when a rim fails, its failure is sudden, loud, and catastrophic.
I presume the crack you see is a symptom of deep wear; your rim is used up. Sorry.
__________________
www.rhmsaddles.com.