Hookless rims are actually a pretty old technology. I had a beater 10-speed from the '70s with hookless ISO 630 aluminum rims. Then as now, they tend to run a l

Hookless rims are actually a pretty old technology. I had a beater 10-speed from the '70s with hookless ISO 630 aluminum rims. Then as now, they tend to run a lot tighter tires than hooked rims, and that bike, as are many newer ones with TLR rims, was kind of a bastard to change a tire on. Source: Among other things, I work at a bike shop part-time and have volunteered as a bike mechanic in the past.