27.5 tire sizes: identify 650B and 584 before ordering
27.5 tire sizes become easier to identify once you separate a familiar wheel name from the diameter that locates a tire on its rim. Schwalbe identifies 27.5 inches, 650B and a 584 mm tire inner diameter as corresponding descriptions. That equivalence is useful when searching a catalogue, but it does not make every tire carrying one of those names interchangeable.
Read 27.5 tire sizes through the ETRTO marking
Schwalbe's explanation of ETRTO notation separates width from inner diameter. In its example, 37-622 describes a nominal width of 37 mm and an inner diameter of 622 mm. Read the two fields independently; the number before the dash is not another way of stating the wheel diameter.
For the diameter discussed here, look for the 584 part of the complete marking. The older French name 650B provides another route to that diameter in a search. It still leaves the width to identify. A seller's shortened description can therefore be useful for finding a category while remaining inadequate for choosing a replacement.
Keep the decimal point in the name
Do not shorten 27.5 to 27 when taking notes. Schwalbe associates the older 27-inch designation with a 630 mm inner diameter. These names do not form a simple numerical scale in which the similar-looking labels describe almost identical rims. Nor does converting an approximate inch name into millimetres reproduce the tire's inner-diameter measurement.
The general distinction matters on the black Raymon Tarok Comp, whose recorded configuration pairs a 29-inch front wheel with a 27.5-inch rear wheel. Make separate front and rear entries before shopping. The bicycle's presence among 27.5-inch bicycle references does not describe two identical wheel diameters.
Turn the label into a complete enquiry
Copy the fitted tire's whole size marking, model and wheel position. Add the rim identification and the actual bicycle, especially if wheels have been replaced. Ask the supplier to check the matching diameter, compatible width and the bicycle's requirements together. The useful outcome is an identified combination, rather than a declaration that everything called 650B fits.
Keep packaging photographs with that record. A clear image of the complete sidewall text is more informative than a cropped photograph containing only the largest inch number. Where catalogue information and the fitted tire differ, retain both as separately labelled observations.
FAQ
Are 650B and 584 different wheel diameters?
Schwalbe uses them for the same tire inner diameter in this context. Their agreement does not settle the tire width.
Can I drop the decimal when asking for a tire?
No. The older 27-inch designation refers to a different inner diameter from the 27.5-inch designation discussed here.
Does a matching diameter approve a replacement?
No. Rim width, tire construction and the actual bicycle's clearance and component requirements still need confirmation.
References: Schwalbe's ETRTO, inch and French naming explanation (https://www.schwalbetires.com/technology-faq/tire-sizes/); Schwalbe tire and rim matching guidance (https://www.schwalbe.com/en/technology-faq/tire-dimensions/); RAYMON's paired wheel-size record (https://www.raymon-bicycles.com/en/tarok-comp-29-27-5-x-m-11s-cues-p2588/).
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