it goes into the bottom of the headtube, just like a headset, then the headset cup is pressed into the extender and adds an extra couple of centimetres often allowing the tyre to clear the frame/pedal.
@hookham59 started
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it goes into the bottom of the headtube, just like a headset, then the headset cup is pressed into the extender and adds an extra couple of centimetres often allowing the tyre to clear the frame/pedal.