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I would like to switch my stem for angle adjustable one and I am having trouble identifying the clamp size for the Gensis, Croix de Fer 20 (2015).

I do not see the stem/bar clamp spec listed.

There are various adjustable road stems :

These both seem to be standard road stem/bar clamp sizes, I am not sure where to find which one Genesis use documented.

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    Do you have a caliper? You could remove the bars from the stem and measure the diameter at the clamping surface. – renesis Nov 11 '15 at 23:37
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    Or a piece of string, and note that the circumference will be pi*d, and it will be quite different between 31.8 mm and 25.4 mm. – Batman Nov 12 '15 at 0:56
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Thanks to renesis and Batman, I used masking tape to measure bar clamping circumference.

100mm circumference => 31.8mm diameter.

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