Orbit Frontier expedition touring bike frame 54cm Reynolds 531 | eBay
I believe originally sold as a drop-handlebar bike, but also works well with flat bar. Cantilever bosses. Seattube 50cm c-c (virtual 54cm). Toptube 54cm c-c. 700c wheel bike, with eyes for mudguards and rack, and at least 30mm tyres.
www.ebay.co.uk
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.