Peugeot Road Bike Tire Size: Match the Diameter Before Ordering
Peugeot road bike tire size cannot be selected from the brand badge. Period Peugeot records contain different wheel descriptions, and old inch labels can be misleading. Begin with the markings and construction of the wheel you actually have, then compare that evidence with the relevant catalogue rather than assuming all road models share a size.
Peugeot road bike tire size varies in the records
The archived UK sports-tourer page (https://www.bikeboompeugeot.com/Brochures%20UK/Peugeot%201980%20UK%20Brochure/Peugeot_1980_UK_Catalog_UO9_PX8_PX18_Page_4.jpg) lists 27-inch wheels for the Trophy UO9. A separate PKN and PX10 page (https://www.bikeboompeugeot.com/Brochures%20UK/Peugeot%201980%20UK%20Brochure/Peugeot_1980_UK_Catalog_PKN_PX10_Page_11.jpg) describes narrow 700C wheels on the Routier PKN and tubular tires on the Professional PX10. These are distinct entries, not a general replacement specification for any Peugeot with drop handlebars.
The purple Tourmalet 14 in the photograph shows a real tire, rim and brake arrangement. The photograph does not provide a verified diameter or a readable complete sidewall designation here. Do not assign it the UO9 or PKN standard simply because one of those catalogue descriptions sounds plausible.
Use the number that identifies the rim diameter
Schwalbe’s tire-size explanation (https://www.schwalbe.com/en/technology-faq/tire-sizes/) describes ETRTO notation through a 37-622 example: width followed by the tire’s inner diameter in millimeters. It identifies 700C with 622 mm and the traditional 27-inch designation with 630 mm. A larger-sounding inch label is therefore not a reliable guide to which of these diameters is larger.
Record diameter and construction before width
Copy all tire sidewall markings and any rim markings, taking photographs rather than relying on memory. Establish whether the wheel uses the tire construction you intend to buy. The PX10’s documented tubular reference is a reminder that a racing description does not automatically identify a clincher tire and separate inner tube.
Schwalbe also explains that tire width and rim width must be matched. After establishing diameter and construction, have the actual rim and the bicycle’s clearances assessed for the proposed width. A diameter match is necessary information, but it does not settle every other compatibility question.
Turn an uncertain listing into a precise request
Give a tire supplier the recorded markings and explain any missing or unreadable information. Request confirmation for that wheel rather than a generic “vintage Peugeot tire.” The Peugeot topic index separates identification and brake questions; the brand guide provides historical background without replacing a wheel-specific match.
FAQ
Are traditional 27-inch and 700C tires interchangeable?
No. The diameter examples documented here are 630 mm and 622 mm respectively.
Does this photograph identify the Tourmalet’s exact tire size?
No. Read its actual tire and rim markings before choosing a replacement.
Does matching diameter alone confirm a suitable tire?
No. Construction, rim width and bicycle clearance remain part of the assessment.
Photograph credits and permissions
Photograph 1
Original title: Bicycle Peugeot tourmalet.jpg
Creator: Peter.shaman at Polish Wikipedia; creator URI: https://pl.wikipedia.org/wiki/Wikipedysta:Peter.shaman
Original source URI: https://commons.wikimedia.org/wiki/File:Bicycle_Peugeot_tourmalet.jpg
License / permission: CC BY-SA 3.0
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