cervelo1

thinking of putting Navaro's on my G37x, guy at Town Fair Tire says 20" will fit fine, anyone running these?

sniper27

iTrader: (2)

20" is very common. just make sure your offset is correct.

cervelo1

thanks! anyone have comments on the ride quality difference?

sniper27

iTrader: (2)

if you're going from 17s to 20s, you will notice a decrease in ride quality. how much is subjective. some will say it's minimal, some will say it's significant.

cervelo1

but better performance, right?

simonsez

performance comes from wheel weight & tires not from running bigger wheelz.
bigger wheel looks good but you will have to watch for pot holes and swerve around all the time. it's a stress.

Legz

iTrader: (1)

20's are heavier (so are the tires), you'll lose performance; then again, it all depends on what wheels/tires you're getting...

sniper27

iTrader: (2)

bigger is not always better. common misconception with wheels.

coolraz

I am rolling on 20s Vossen CV-2s as a daily driver.

Couple of things to know
1) make sure the offset is correct. You need to talk to someone who SPECFICALLY knows this for your car. Vossens have a few offsets which are called "direct fit" for G37 where you dont need any spacers etc. You need to figure out the offsets of those wheels and see if they will fit with the G. If the offset is too weak (+), you can always add spacers to get it flush. However, if it's too agressive (-), you will have wheels stick out of your fenders and look like those VW or Audi peeps (actually i think it looks good on their cars, just not on a G).
2) ride quality. I think mine ride as good as stock. Then again I have pretty meaty tires (255 F, 285 R) so the rubber cushions the road. If you run really narrow profile tires like some people do for a more stretched look, then you will have a little harsher ride
3) potholes. little potholes=no problem. Big potholes=swerve like a ****! Bigger rims menas less rubber so a pothole is more likely to curb your rim. If you live in pothole county like Canada, it's gonna be a pain. Where I am is rural but roads are pretty decent and I dont have problems
4) performance. I will guarantee you the 20s will be heavier than the stock wheels. That and you will have heavier rubber too. Your 0-60 will suffer, but car should be just as quick when rolling. I posted a thread on this "Do Vossens Make you slow?" it has all the explanations
5) Looks. Hellz yeah 20s look better and its pretty much the biggest you can go on a G. Anything above that is just whack (my opinion : )

jran76

iTrader: (2)

My 20" wheels weigh 5 lbs. less than my stock 18" wheels.

jddssc121

Tire Size Calculator - Discount Tire Direct

4drScreamer

That's a pretty good summary. I would add:
6) Handling. Lower profile tires result in less roll and better grip.

All aspects of this upgrade are relative to what you want. If looks and handling are less important than ride quality and concern about potholes, then stick with stockies. Personally I love the ride quality of my 20's. I avoid as many potholes as possible regardless of what I'm driving on. Because I live on a hill with lots of curvy roads to get on and off of, body roll is something that I minimize at all costs and my lower profile tires help with that. I also do quite a bit of long freeway trips and am never bothered by road noise, bumpy ride or the sense that my "big" wheels are slowing me down. The G is so quick that I think it would be very difficult to be able to tell the difference between a 17 and a 20. Maybe on a drag strip, but really?

Good luck with your decision!

cervelo1

thanks for all the input, just bought them today and love them. Started a new thread with pics. check them out and let me know!