Marin Four Corners gearing: compare the current double and single ranges

Marin Four Corners gearing differs substantially between the current CUES Four Corners 1 and the referenced Apex Four Corners 2. One uses a double chainset and the other a single ring. Compare the actual tooth counts before interpreting the number of rear sprockets as a statement about the lowest available gear.

Identify the Marin Four Corners gearing in each reference

The CUES Four Corners 1 listing gives forty-six and thirty-two teeth at the front, with an eleven-to-thirty-six cassette and two-by-nine controls. The Four Corners 2 listing gives a forty-tooth Apex single ring, a ten-to-fifty-two cassette and one-by-twelve controls. These are two documented complete-build references, not interchangeable component shopping lists.

For a used bicycle, count or read the actual ring and cassette markings before doing the calculation. A seller's description of a single conversion may explain why the fitted equipment differs from the original reference. Ask what changed and retain that information; the model family alone cannot establish the drivetrain that remains on the bicycle.

Calculate endpoints on the same basis

Dividing chainring teeth by rear-sprocket teeth gives a simple transmission ratio. For the double's low endpoint, thirty-two divided by thirty-six is about 0.89. For the single, forty divided by fifty-two is about 0.77. At the high end, forty-six divided by eleven is about 4.18, while forty divided by ten is 4.00.

On that tooth-ratio basis, the referenced single reaches a lower low endpoint and a slightly lower high endpoint. The calculation is not a road-speed figure. The actual wheel and tyre circumference also matter, particularly because these frame tables use different wheel families for XS/S and M/L/XL. Keep the frame size beside the gearing comparison.

Use the arithmetic for the intended journey

A rider choosing equipment for loaded riding can ask which endpoint is useful on the intended route and how the intermediate steps feel. A wider overall range does not identify the spacing of every shift, and a larger sprocket count does not by itself prove a preferable cadence. Compare the actual controls and complete drivetrain in an appropriate riding assessment.

Do not interpret these figures as approval to install the other model's cassette or chainset. A conversion brings separate questions about the frame, controls, derailleurs, wheel and compatible parts. Obtain a complete supported proposal before buying components. The purpose of the calculation is to make the choice more precise, while leaving fit, condition and actual loaded handling to their own assessments.

Gearing comparison FAQ

Which referenced setup has the lower tooth-ratio endpoint?

The forty-by-fifty-two single is about 0.77, compared with about 0.89 for thirty-two by thirty-six.

Does a 4.18 ratio specify a road speed?

No. Wheel circumference, pedalling cadence and the actual riding situation are not supplied by that tooth ratio alone.

Do these numbers prove the two drivetrains can be swapped?

No. Their arithmetic comparison establishes no complete frame, wheel or component compatibility for a conversion.

Use confirmed tooth counts to define the gearing question before comparing complete bicycles. For the current double build, use CUES component identification 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.