Genesis Croix de Fer 30 Thru Axle: Spacing Is Only One Dimension

2026-10-27

Genesis Croix de Fer 30 thru axle information needs to be read as separate dimensions. The GN21050 manufacturer's sheet records a front hub size of 100mm x 12mm and a rear of 142mm with a 12mm axle. These entries do not supply every dimension needed to order a replacement axle.

Historical black Genesis Croix de Fer with racks and mudguards beside a river, photographed in 2018 — Historical Genesis Croix de Fer identified by its photographer as a 2014 model, photographed in 2018. It illustrates the family, not the GN21050 build or its component compatibility. No endorsement implied. Original photograph source (https://commons.wikimedia.org/wiki/File:02f-Genesis_Croix_De_Fer2014_(NgnL)--2.jpg)

Genesis Croix de Fer 30 thru axle: Keep front and rear records separate

The front and rear positions have different spacing figures in the document. Copying the rear entry into a front-axle enquiry would therefore lose a basic distinction before any other compatibility issue is considered. Label each record with its wheel position.

The equipment section also names different Formula hubs: RX-812 at the front and RX-300 at the rear. Those names can help identify the specified wheel build. They do not prove that the hubs or axles on a used bicycle have never been replaced.

Do not treat spacing as overall axle length

A hub-spacing label describes a wheel/frame interface. It is not a complete statement of a replacement axle's overall length, threaded section or thread pitch. The GN21050 sheet does not list those purchase details, so do not manufacture them from the familiar 100 or 142 figure.

Keep any readable markings on the original axle and ask for the correct part for the actual frame or fork. If the original is missing, provide the bicycle's identity and the remaining component information instead of assuming all Genesis axles are interchangeable.

Check the complete wheel requirement

The sheet specifies a twelve-millimetre thru-axle frame and fork. A different wheel must also satisfy the relevant hub, brake and bicycle specifications. Correct spacing alone does not answer those other questions, and this guide does not approve a conversion from another axle system.

The source-identified 2014 Croix de Fer in the photograph is historical context. Its appearance is not evidence that its original axle arrangement matches the GN21050 sheet. Keep the image and the later build document as different records.

Prepare a precise replacement enquiry

Record wheel position, frame identity, fork identity and the actual axle markings. The Genesis guide explains the family's development, while the Genesis topic offers more component coverage. This enquiry needs a matched part, not merely a retailer listing containing the words twelve millimetres.

This article provides no tightening torque or wheel-removal procedure. Have an unresolved axle or wheel-retention problem assessed before riding.

FAQ

What front spacing and axle diameter appear in GN21050?

The document lists 100mm front spacing with a 12mm axle.

Is the listed 142mm rear spacing the complete replacement axle length?

No. Overall length and thread details are separate specifications that the sheet does not provide.

Does this approve converting an older Croix de Fer to thru-axles?

No. The actual frame, fork and wheel arrangement need their own compatibility assessment.

Sources

Front and rear spacing entries and the named hubs identify the original wheel interfaces. The document omits the replacement axle length and thread details needed for ordering. Genesis Croix de Fer 30 manufacturer specification, GN21050, pages 1–2 (https://www.freewheel.co.uk/media/madison/product-files/525553/Genesis_Croix_De_Fer_30_VARGN21050.pdf). Original evidence retrieved 26 October 2026; saved document rechecked 27 October 2026; the code identifies the document, without inferring its model year.

Photograph credits and permissions

Photograph 1

Original title: Bike Resting at Ruillé-sur-le-Loir Campsite, France

Creator: nogoodnamesleft.net (Commons contributor No(0)GoodNamesLeft)

Original source URI: https://commons.wikimedia.org/wiki/File:02f-Genesis_Croix_De_Fer2014_(NgnL)--2.jpg

License / permission: CC BY-SA 4.0 International

License / permission URI: https://creativecommons.org/licenses/by-sa/4.0/

Modification notice: Wikimedia-provided 1280 × 611 downscaled JPEG delivery of the original photograph. No crop or further image edits by this publisher.

Source disclaimer: The creator says notification of use outside Wikimedia projects would be appreciated but is not a condition of use.