Look at shinras pics mate his 18's pretty much fill the arches so id say 18's are the max you want to go really! With the width when your looking for alloys you get a size like 7x18 if i remember rightly the first number is the width in inches so the bigger that number the wider the tyre???

so is there a max width for the coupes?

hmmm......I'll do a bit more research into this, It is hard enough finding nice alloys lol!

(digging up an old thread)

i'm goin to go against the grain here, from experience. to start with you can't have wider tyres on the front, it's illegal, and if you get pulled over it'll be a max of £2,500 and 3 points......per tyre.

No-one has mentioned offset yet. the offset is measured in mm and is the difference between the mating face of the hub of the wheel, to the actual center line of the wheel. small number/negative numbers push the wheel outwards and higher number pull the wheel into the vehicle.

Wider wheels/tyres on the back with increase the cornering capabilities in the way of you having more control, and can feel what the car is doin/about to do better. It will also increase the stability at higher speeds (motorway)

It is an idea to have slightly wider tyres on the front as you will get more grip, but go too wide and the side effects will start to take over, ie. rubbing on the arch/liner, tramlining, and mroe importantly the 'turn-in' will be reduced. when that happens the car will feel like it's taking longer to get into the corner and will feel like its goin round into it rather then cutting into it.(obviously you don't have to worry so much about this on the rear, but it does happen)

if it remember correctly Hig you have a gen 3??? i would be tempted to go for 225/40 18's et46 8x18 on the front and 225/40 18's et35 8x18 on the rear. this way you'll get more grip from wider tyres, the reas will stickfurther out in the arches filling it better.

some info i took from newtib btw :-)

higs got a 1.6 gen 2 - with teh weight of those wheels on a 1.6 id be suprised it would move

or how it wouldn't :P

with the 1.6 i'd say max medium-light weight 17's
i couldn't help you with the offset and widths thou