Not true mate .... I ran the original ZX5 king-pin ballstud and lower king-pin bolt in my SP for all it's life!
I used to actually prefer to run the king-pin ball stud position as it smoothed out the SPs agressive front end making it much easier to drive hard. In fact the only reason I've not fitted the king pin ball stud to the FS is that I've somehow lost them and not got round to ordering new ones!
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