• Because headtube length isn't the best way to measure it, due to the difference in bottom bracket height and fork length.

    Bike like the Datum for instance have a CX length fork, bike like the Domane have a near standard length fork, meaning you can't really compared the headtube length between those two model.

    Best way to measure the height, is using the stack from the stack and reach measurment (the stack are much more accurate and able to fine-tune your handlebar position).

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