interesting thing i found out this week while buidling my '74ish pr10 ...
i can't remove the 27" rear wheel with its inflated 1" pasela unless i deflate most of its air. in the drops, there's only a cm of space between tire and stay bridge, which isn't enough to clear the drops upon wheel removal with a fully inflated tire.
this is my first experience with this issue ... ever. and it's not a big deal unless i experienced a flat out on the road and forgot this little fact before i used my last co2 cartridge to inflate the tire with the wheel off the frame.
since the front brake reach is near its bottom, i assume the bike came equipped with 27" rims. but maybe my front fork is unoriginal.?.
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edit: things are as they seem. my fork is probably unoriginal, 'cause
the catalog page says it came with tubulars. this would explain the rear tire dismount clearance.