An excellent explanation from Mr Gazza (worthy of Tony Foale, I'd say!).
Just to help illustrate the point, I found this gif on ducatiforum.co.uk, which nicely demonstrates the result of changing the fork offset. (Apologies for the K*M logo!)
Quote:
Originally Posted by Mr Gazza
...but the trail can be manipulated with different offsets on top and bottom yokes. (Provided the angles in the bores are correctly machined).
Norton did this with the late 850 Commandos, although I'm not sure which way they went.
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I think the Diavel uses this trick to allow it to run a lazy 28° rake but still have reasonably quick steering.