Is it just an optical illusion or does it have more clearance.

Why I am interested is because I have a set of hubs and I have always considered having the rear built on a 18 inch rim (mainly because that allows more tyre choice).

I am just about to swap over for a 14 tooth front and was seriously wondering how the 18 would go for better torque transfer. When I raced go karts the front and rear tooth combination made huge differences on various tracks.