Originally Posted by
SpedFast
They were probably intended for standard 1 1/4" tires.
Sorry, missed your question- I get my tires for the old 27" rims from my hardware store. Usually only one avail. in 27" and usually just 20 US dollars. In fact, they haven't upgraded their stock to 700c yet either. (small town) And we have a lot of riders on Hwy 101

1984 Trek 610 came stock with 27 x 1 ⅛ tires, I think marked IRC. That was “off the rack “ equipment for that bike.