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I always just measure from the center of the swing arm pivot point to the center of the axel. You can put your own gage marks on the swing arm the first time and go by that ever after.



That's the Harley method...same as I use.



Doesn't that assume the motor, frame and swing arm are perfectly aligned? On my '06 I had to shim behind my front sprocket 60 thou to attain a better sprocket centerline situ, it was either that or re shim the entire rear wheel to the right. Mass produced weldments such as our frames always have a permitted plus/minus rate of acceptable end result, albeit, I'm sure Triumph runs tighter go/nogo specs than Ford or GM, at least I sincerely hope so.