Fork rake ... you mean steering head angle...
If you vary the fork rake from the steering head angle (i.e. they are usually the same) then as the suspension moves you get different trail .. and so different handling .. much rather have consistency?
Changing the steering head angle requires modification of the frame...
I hope your measurements take into account any offset between the wheel axis and the fork axis.
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Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S
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