Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,194
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
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What brand of rims on the Legnano?
Quite a few old Weinmann clincher rims were prone to blow-off at modest pressures as low as 75psi using almost any wire-beaded 27" tire.
I think that the quality control of the diameter was the reason that some rims did or did not suffer this issue. Newer (still hookless) rims seemed to improve on their bead-retaining ability, and I remember 1970's Japanese single-walled rims reliably containing 100psi.
All the Super-Champ 27" rims I've seen had at least some bit of a bead-retaining lip or nub, and none have given me trouble.
But pre-~1977 Weinmanns are a crap-shoot it seems.