Thanks, Michel. Thats great info. Is it true, that hooks are a feature of modern rims? I've refurbished a couple of 70s vintage Raleighs. When replacing tires, I bought some Continentals. Continental prints a warning on the tire that they are only to be used with hooked rims. They even print this warning on their 27 1/4" tires. None of the steel or alloy rims that I have from that era have hooks. I tried discussing this with the guy at the bike shop. He told me all rims had hooks and I must be mistaken if I thought mine didn't have them. I didn't trust what he was telling me.
So am I at risk if I inflate tires beyond 70-80 lbs on these rims without hooks?
Is the Continental warning to be heeded only if their rated air pressure is used?
thanks,
kranz