Originally Posted by Nessism
It also occurs more often on bikes with slack head angles and lots of fork rake.
Only if trail is present. "Flop" is a by-product of "trail"
Trail is the distance between the center of the contact patch of the front wheel on the ground, and the point where the "virtually" elongated steering axis meets the ground. Since the contact patch is (usually) aft of the steering axis (establishing positive trail), whenever the laden bike is leaned
, the weight of the bike sitting on the contact patch, effectively turns (or flops) the front wheel in the leaned direction. Eliminate trail (for illustrative purposes only) and flop disappears because the contact patch (now centered along the steering axis) offers no leverage to turn the wheel.
Additional weight over the front wheel intensifies "flop" on trail laden bikes, but is not the cause.
Last edited by PaPa; 06-02-07 at 07:02 PM.