It would affect acceleration and braking

 

To each his own John I'm not advocating 20's(or any size for that matter). Looks are definitely not everything and if the way you drive is sensitive and particular to minute differences between a 19 and 20 in wheel, then by all means, go for what works for your 'style'.

Any change in wheel size, whether it be +1, +2 or more, will affect the characteristics of the car, and of course, the less its affected the better. Most people are, though, won't split hairs about the small difference in 19's and 20's. We're not talking Escalades and Expeditions plus sizing to 26in wheels here. And not sure if you noticed but the new G's 13in. brakes aren't that much tinier than what comes on most higher end performance cars nowadays. I may not be as adept as you are when it comes to feeling performance changes but I've noticed no change whatsoever in the braking after running the 20's. The extra grip from the wider tires may be making up for it, though, so I couldn't assert for sure.

If you really wanted to get the purest performance out of the G that it was meant to have out of the factory, why not just get slightly wider 18's, better tires and a fully adjustable coilover suspension? It may look a bit small in the well but as you mentioned, looks aren't everything and your performance won't be affected one bit by a bigger wheel diameter at all in a negative way. Just my opinion on what I think you're trying to get at.

Whatever you do choose to go with, though, I'm sure it'll turn out great.

 

I'm already have a freind talking to his contact at tein to get some coilovers with edfc, I was thinking of staying with the 18" wheels but I feel the sidewall is too tall and rolls when pushed hard, I think the 19" should be a good middle ground. I'm also looking in to different brakes, Brembo has a front kit with 2 different size rotors but they don't have a rear kit yet. I think I'm going to go with 19X8.5" it the front and 19X9.5 it the rear, and lower it around an inch, I don't want to move the roll center too much, and I still would like some suspension travel.

 

double post

 

So I couldn't get the Teins and I didn't want to get wheels before I lower it so I have the H&R springs on the way. I'm going to get these wheels, 19X8.5" +35 F ; 19X9.5" +42 R mercury silver




I'll get the coilovers later, I think I have a primo spot on the dash for the edfc control unit.

 

^^

those are def. gonna be siiiick, post pics asap!
-GP-

 

I used to love these debates until the sun went down. Nowadays, you can go to the tire shop with the sweet Hunter GSP9700 with the Road Force Measurement and they turn away > 20" rims though the machine can handle dub 4 1/2's. Long story short there is a rim diameter that is past the law of diminishing returns...I'm gonna guess it's 18". So far I've ruined 2 sets of 18" rims riding on a 235/40-18, on my Nissan, 18x8 with a 35 and then a 38 offset. As I got the 2nd rim replaced I told the tire shop I'm done with aftermarket rims. The owner said "it ain't worth it. They look nice, but they give you no added performance and a headache due to the potholes." And here's a guy that sells these rims and tires and sends his kids to college, yet he's honest about the situation.

 

'Debate'? What debate? Nah, no debate going on here. Its about as much of a debate as saying what color is best and why you think so.

Some like to de-badge, some don't. Some like to black out their taillights,headlights, sidemakers, front windshield whatever else they can make black, and some don't. Some like 18's, some may want 21's. Totally subjective to what you're into.

Everybody's got their reasons for what they do and it'll always be right in their own eyes. Thats all that matters in the end, really.

Nice choice in wheels, btw, john! Can't wait to see them mounted up!