Marin Four Corners wheel size: start with the actual frame size

2026-10-23

Marin Four Corners wheel size depends on the frame size in the current manufacturer tables considered here. A Four Corners name on a sales advert does not select a single wheel diameter. Establish the exact bicycle and size before using either the CUES-equipped Four Corners 1 listing or the separate Four Corners 2 reference.

Green Marin Four Corners exhibition bicycle with drop handlebars and a triple chainset, displayed indoors — Marin Four Corners 1, Cycling World Europe 2025, Meerbusch (P1045221).jpg. Photograph by Matti Blume, 29 March 2025. Source notice: CC-BY-SA 2.0+ Matti Blume. Licensed CC BY-SA 4.0; original unchanged. Historical exhibition bicycle; exact model year, size and factory equipment unverified. Family context only; the current CUES and Apex configurations are not documented by this photograph. Original photograph; Matti Blume; CC BY-SA 4.0.

Read the Marin Four Corners wheel size split

Both frame rows assign 650B wheels to XS and S, and 700C to M, L and XL. The Four Corners 1 reference is the current CUES listing. The Four Corners 2 page is currently labelled 2025 within its content, despite a 2024 address. Keep that source identity with any copied specification rather than assigning a model year from the address alone.

Write the confirmed frame size beside the wheel entry, rather than saving an isolated sentence saying the model uses 700C. For a used bicycle, read the actual wheel and tyre markings as well. A replacement history can matter even when the original size-specific reference has been correctly identified.

Keep the tyre row attached to its scope

The Four Corners 1 tyre entry combines 700 and 650 with a nominal forty-five-millimetre width. The Four Corners 2 frame row retains the small-size split, but its generic tyre entry says 700 by forty-five. That does not resolve which exact tyre is supplied on a particular XS or S bicycle.

If a small Four Corners 2 is the proposed purchase, ask the dealer to confirm its actual supplied wheels and complete tyre markings. Do not silently replace the generic row with a guessed small-size specification. An incomplete catalogue field is a reason for a precise question, rather than proof that the frame takes both diameters interchangeably.

Turn the diameter into a complete ordering question

Once the diameter is established, a replacement wheel still needs the correct hub, axle and braking interfaces. Supply the supplier with the confirmed frame identity and installed wheel details, and say whether you need a tyre, a rim rebuild or a complete wheel. Those are different requests; a correct diameter cannot answer them all.

Treat an advert's word upgrade carefully when it proposes a different wheel family. The current size split is not approval to change the intended diameter on an existing frame. Ask for model-specific compatibility confirmation before assigning value to such a proposal, and keep the written answer with the bicycle's record rather than relying on a seller's general description.

Frame-specific wheel FAQ

Does a size-M row use 650B in these two tables?

No. Both referenced frame rows place M with L and XL in the 700C group; XS and S form the 650B group.

Does the generic Four Corners 2 tyre row settle an XS delivery?

No. Its 700-by-forty-five wording does not explain the small-size frame entry; confirm the actual supplied equipment.

Does the correct wheel diameter establish a complete wheel fit?

No. The actual axle, hub and braking requirements remain separate parts of the replacement specification.

Record the frame size and wheel family together before asking for a replacement. For another wheel-related decision, see tubeless setup evidence in the Marin collection.

Primary reference: Marin current Four Corners 1 CUES build and geometry.
Primary reference: Marin Four Corners 2 build and geometry; content labelled 2025.