Join Date: Sep 2011
Location: Manchester, England
A spinning wheel is hard to disturb using the hub, yes - but that is because you only have a 1 inch lever, not because the force is large.
Multiply your lever by 30-40 times and things change dramatically. Its an illustration of levers more than anything else.
I want to point out that I'm not guessing about this stuff - I work on dynamics for vehicle/aircraft manufacturers and the military.
If you calculate the torque from gyroscopic forces on a bike they come out at about 6 NM, that isn't going to hold a bike up.
Bike stability comes from its geometry.
Keep the tyres the same and change the rake of the forks and the bikes stability will change, half a degree will make a significant difference.
A sports bike and a cruiser with exactly the same wheels and tyres have the same gyroscopic forces but the stability will be different. The sports bike will be twitchy and the cruiser will be relaxed because the geometry is different.
The sports bike will be more prone to tank slappers too, again because of its geometry.
Last edited by Bluebottle; 11-12-2015 at 08:18 AM.