• On road if you can cope with the flex quill stems are usable but off road on a BMX they are a nightmare. Constantly coming undone.

    The main stiffness come from the steer tube / stem interface. Ahead: clamping over a 1 1/8 (~28mm), quill stem internally clamping and only 22.2 mm diameter. A massive difference. This then gives a larger area to to in turn weld the main part of the stem to allowing a stiffer stem again. Add in the lower weight and higher strength and ahead win. I still think unless you get a custom frame builder to build you a nice stem quill stems look better though.

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