• an easy bit of kit to use would be the Ahead converter adaptor, simply cut fork steerer to size as mentioned in earlier answers as if you were fitting a quill stem then purchase a converter that pops into your steerer/headset tighten up the internal 6mm allen key then clamp your Ahead stem onto the unthreaded protrusion....et voila!

    ps: we sell them in our shop for £9.00 and have used one for years with no problems at all

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