I have been looking for new wheels and I have decided on BBS RGR's in Diamond Black.
They come in both ET55 and ET50. The ET55 gives me 9mm less inner clearance and a 3mm outer extension. While the ET50 gives me 4mm less inner clearance and a outer extension of 8mm.
Which of these two settings is the best to maintain current drive characteristics? I am keeping the same wheel diameter but increasing the wheel width by half an inch, which could still be run on the same tyres. Remember when answering the Mazda 3 MPS is 263bhp and 280 lb-ft front wheel drive car.
Thanks for your help.