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
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