I did not see the "hookless" detail when you posted this to iBob. I would not ride a hookless rim under any circumstances today, and would like even less to use a modern tire on one. I can understand their place on a show bike, though I suppose there are few places where that would affect the CR gang, rooted in the Tubular Age.
Modern tires rely on that hook bead, and I can't believe that your Pasela stayed on long enough to lull you. I guess hookless tires were simply a tight fit whenever high(er) pressure ratings were the goal, although they are really before my time. I have seen modern tires blow off of hook bead rims before in our shop.
In fact, the most common place I ever see hookless rims now is on the little plastic mag wheels that some baby strollers come with. They very often blow off in hot cars. On those, I'll go about 25psi max.
BTW, I use 35mm Paselas every day at around--but often above--their 90psi maximum.
jeff slotkin charleston, sc
On Sep 9, 2008, at 1:21 PM, ryan hildebrand wrote:
> While riding home from work yesterday, I looked down at my rear hub
> and noticed a large amount of grease collecting on the non-drive side
> pressed in cap (Campag NR hub). About 2 minutes later my rear tire
> crept off the rim (Pasela TG wire bead on Weinmann hookless rim at ca.
> 105 PSI). Are the two events related? I.e., are there asymmetric
> forces one could associate with a slowly unseating tire which would
> result in grease leakage from the hub? Or am I looking at two separate
> events with uncanny timing? I haven't yet pulled the hub for other
> clues.
>
> I posted this to the BOBs yesterday where it got no replies, so my
> apologies if you're seeing this twice, or if the question is
> ridiculous.
>
> Ryan Hildebrand
> Costa Mesa, CA USA