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I am aware of the taper in the top yoke.  If the roadholders were fitted to a manx frame and 18 inch wheels are fitted, the forks would need to be a different length to get the trail right.  If different shaped tyres are used e.g. triangulars, there would be a slightly different trail required to give optimum handling.  I suggest with the manx, a bit might depend on the year of manufacture.  As for the roadholders fitted to P11 or N15, I've never encountered them, however If I was fitting them to a featherbed, I'd find a late model manx, measure the fork staunchions, and adjust in the lathe accordingly.  With steering geometry, it takes almost nothing to create a hazard.

I do know this - the roadholder forks and yokes fitted to a garden gate Norton are very wrong for a featherbed frame. The yokes are radically different - far too much offset.


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