Thanks for the comments guys! I haven't been able to find any tires available for 26 x 1 3/8" rims, that are rated at higher pressure than 55#. Harris and one other place list them on their web sites, but they are no longer in stock. The Michelin World Tour has a reflective stripe on the gumwall that I thought would spoil the vintage look. So I bought these to use until I find higher pressure replacements. Now, my only real problem is getting the fenders to clear adequately. These tires seem to be much larger than those they're replacing! A little gentle bending is on tap for this afternoon.