Generals Alpha is an OpenRA mod that recreates Command & Conquer: Generals on OpenRA engine as much as possible but using Red Alert and Tiberian Dawn artworks.
Artwork by Nolt.
Since it would be a bit hard to show details properly i used icons on the units to indicate which unit it driven by. Rebel/Jarmen and Rocket Cycles has own firing animations.
We made them scale well against infantry and not vehicles otherwise it would look wierd when loading/unloading and with near other infantry when it has a visible driver on it.
Proper logic to replace existing driver doesn't exist yet so driverless cycles are a thing. You have to unload the existing cargo and put new one.