Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,181
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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The Weinmann 27" rims from the early 70's, not the Concave model but the plain OEM model has a troublesome quality control record in terms of having inaccurate diameter needed to retain a tire at high pressures.
I've had to add layers of tape that reaches the inner sidewalls of those rims on my Schwinn Supersport, not easy to do when the inside of the rim has anything but a flat shape. I had to trim down some very wide Velox tape to help the tires not blow off above 75psi.
I remember lots of other 27" rims having no problem at all with tires inflated to 90 or even 100psi, that's what the tires on new bikes had printed on them as mounted to hookless 27" aluminum rims.