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@Smallfurry
You get more aero advantage from a aero front wheel then a rear wheel. But on the road you can only go so deep on the front, before the bike becomes difficult to control in cross-winds. As you have around 65% of your weight on the rear, and it is not steerable, you can go deeper on the rear, while maintaining decent handling.
In a velodrome you have no wind so can use deeper front wheels. You therefore see front and rear discs used in certain track events. There is no reason to use a shallower rim at the back, other then hipster fashion (AFAIK).