I don't quite understand your sentence - sorry. Yes, all 4 wheels can rotate independently on their respective axes... there are no axles running across, if that's what you mean. But that's not what fixed bogie means.
FLEXITY Freedom (our trains that ion is getting) is fixed bogie, meaning modules 1, 3 and 5 have wheels, 4 each, and those 4 wheels are mounted semi-rigidly (there are some small amount of rubber cushioning between this frame and the vehicle frame to try and mitigate vibrations) on a bogie frame directly connected to that module. Think of a mining cart, with 4 wheels rigidly mounted on the frame. Fixed bogie results in a simpler construction and permits an easy way to get 100% low floor, at the expense of ride quality and turning characteristics, because the wheelbase between the axles is generally longer as a compromise between nose pitching and turning capability. The closer the axles are together, the better the wheel-to-rail tangent interface is... but the worse the nose-pitching problem becomes (and you get horrible turning oscilations). Putting the axles further apart gives you a stiffer ride with less of those oscillations, but the wheel-to-rail tangent goes all out to lunch, making noise.
TL:DR - LFLRV's with fixed bogies squeal and make lots of metal-metal grindy noises in curves. (Unlike monorails riding on rubber tires on a concrete guideway, which are near silent.)
Fixed-bogie 7-module Bombardier FLEXITY 2 Tram at Gold Coast, Australia on G:link, built by many of the same system partners as ion.
FLEXITY Freedom (our trains that ion is getting) is fixed bogie, meaning modules 1, 3 and 5 have wheels, 4 each, and those 4 wheels are mounted semi-rigidly (there are some small amount of rubber cushioning between this frame and the vehicle frame to try and mitigate vibrations) on a bogie frame directly connected to that module. Think of a mining cart, with 4 wheels rigidly mounted on the frame. Fixed bogie results in a simpler construction and permits an easy way to get 100% low floor, at the expense of ride quality and turning characteristics, because the wheelbase between the axles is generally longer as a compromise between nose pitching and turning capability. The closer the axles are together, the better the wheel-to-rail tangent interface is... but the worse the nose-pitching problem becomes (and you get horrible turning oscilations). Putting the axles further apart gives you a stiffer ride with less of those oscillations, but the wheel-to-rail tangent goes all out to lunch, making noise.
TL:DR - LFLRV's with fixed bogies squeal and make lots of metal-metal grindy noises in curves. (Unlike monorails riding on rubber tires on a concrete guideway, which are near silent.)
Fixed-bogie 7-module Bombardier FLEXITY 2 Tram at Gold Coast, Australia on G:link, built by many of the same system partners as ion.