Stormylolol
Retro Guru
Thanks for the info that’s very helpfulSo I've been out & measured up my Orbit tourer from the same era- with 531 tubes & cantilever brakes. I'd say it's the next size up - It's approx 56.5cm CTC seat tube. The head tube is 15.5 cm- see pics. You can ask the seller to measure the Head Tube- there's less scope there for getting it wrong. If it's 15cm or more, leave it. If it's 14 cm or so you'd be i with a better bet if getting the right size for you...
I just went out to my 22 inch CB with a meter rule and had a go. 23” makes sense for the seat tube including bottom bracket shell. The top tube not including seat tube/head tube measures 20.5” so I’m inclined to agree with @bikeworkshop in that it’s a 22.5” C-C top tube as it would make it half an inch bigger than mine. I’m not sure how the seller has managed to send 22” in that case after I sent photos but
