Genesis Croix de Fer 30 Size Geometry: Compare the Coordinates
Genesis Croix de Fer 30 size geometry is more informative when you compare named measurements than when you turn a frame label into a rider-height promise. The GN21050 sheet provides XS through XL geometry. It gives real coordinates to compare with a bicycle you know, while leaving the actual fit decision with the rider and the identified setup.
Genesis Croix de Fer 30 size geometry: Compare stack, reach and standover
In the documented range, XS has 553mm stack and 365mm reach; M has 593mm stack and 385mm reach; XL has 633mm stack and 405mm reach. Their standover entries are 761mm, 808mm and 850mm respectively. Keep each set in its own size column.
| Size | Stack | Reach | Standover |
|---|---|---|---|
| XS | 553 | 365 | 761 |
| M | 593 | 385 | 808 |
| XL | 633 | 405 | 850 |
These are different measurements, not alternate ways to express the same dimension. A longer seat tube alone cannot tell you how far the handlebar will feel from the saddle. Likewise, standover is a frame measurement rather than a supplied rider-height recommendation.
Use the correct document and frame
Identify the actual version before comparing a used bicycle with this table. The same family name has existed across generations, and a letter size does not prove that its coordinates stayed unchanged. The historical photograph does not identify a GN21050 size or establish the fit of its owner.
Include the specified contact-point equipment
The table lists 400mm handlebars for XS, 420mm for S and M, and 440mm for L and XL. The crankarm lengths also change: 170mm for XS/S, 172.5mm for M/L and 175mm for XL. Those are original-build distinctions worth recording when the actual parts have been changed.
The document does not specify how every handlebar width was measured or provide an individual fit prescription. Do not add a measurement convention or claim that a wider listed bar automatically suits a taller rider. Ask how the actual fitted controls and contact points work for the rider.
Bring a comparison rather than a guessed size
Record the geometry and equipment of a bicycle that is comfortable, then identify the differences you want the shop to assess. Include intended riding and the controls you need to reach. This is more concrete than asking which letter size is best for every person of one height.
The Genesis introduction places the models in context, and the Genesis topic gathers related guides. No height chart or personal fit assessment is claimed here. The useful result is a correctly matched geometry table and a record of the real components.
FAQ
Does the GN21050 table provide a universal rider-height chart?
No. It supplies bicycle dimensions that need an actual fit assessment.
What stack and reach are listed for the medium size?
The table lists 593mm stack and 385mm reach for M.
Are the original handlebars the same listed width on every size?
No. Their listed widths step from 400mm to 420mm to 440mm across the sizes.
Sources
The GN21050 size columns supply stack, reach, standover and original contact-point equipment. These bicycle dimensions do not create a height-to-frame recommendation for an individual rider. 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.
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