would i be able to fit a set of 195/55/15 under a set of 9and a half rear cycle wings useing a capri axle

Probably. But it also depends on the wheel offset, and the width of the chassis.....

it is a standard book chassis

Pretty sure you'll need some spacers on the back. whats the offset on the wheels.

I've got a Capri axle, 6x13 ET18 wheels with 185/70/13 tyres in 10.5" arches, they fit fine on a book chassis. you could probably workout what else will fit inside your arches from this.

Mark