you can fit 17's if you want it to ride like a tanga. if you wish to have a decent ride and not put too much load on the bearings you can fit 195/60R15's (6mm/.99% larger) or MAXIMUM 205/50R16's (2mm/.33% larger) but that is about it.
(do note that 225/40R17's will also fit under the arches and will be about the same size as the OEM size tyres in height but they WILL damage your suispension, steering and wheel bearings)