Lighter rims weight do a significant overall performance gain on accelerating, braking and cornering. After change rims for my Civic, 5 lbs reduction each corner feel like a 10-15 hp gain.

G35_TX, what is the air pressure that you have when you weigh your rim/tire? I read somewhere that it's best to inflate to 40psi during autocrossing but the factory recommends 30 psi for comfort. That extra 10 psi contributes to a few lbs too.

 

Around 30 psi when weighed.


I ran 38 front and 36 rear at autox after trying 38 front and 38 rear.

 

I ran 40 all around, and I still had quite a bit of rolling on the sidewalls. I'm gonna try 42 on the rears this Sunday, and leave the fronts at 40, though I have no idea how that will impact the handling characteristics? Maybe a little less oversteer? Or is that backwards?

 

Sorry and not meant to start another thread within this one. I am curious where the tire pressure system is mounted and how is it connected?

For you guys that change your wheels, how do you put the tire pressure system on the new wheels?

 

It's part of the valve stem. Swap the stem, and the sensor goes with it.

 

That's strange, even at 38,36 I didn't have much rolling of sidewalls on mine.

Edit: The higher you go, the better chance of less sidewall flex and maybe more grip. You have to find that right area of PSI for the tire to do its best. The rear to keep it from being so loose and loosing it I went slightly lower than the front.

 

Pardon my stupidity. I thought all wheels come with the valve stem attached. I didn't know you can remove it. How do you remove it???

From the stem it doesn't it have connection/cable that connects back to the car?

 

now i love my rims ^^
my 18' is slightly below 20 pounds each..

but man, i was taking away my 04 17' sport rims yesterday from
my trunk..and it is freaking heavy..maybe the rubber, i dunno.

 

I can't seem to find any info on the weight of the 235/45/18 OEM Goodyears (NCT5s right?) that come on the 18" sedan wheel - can't find it on Goodyear's or Tirerack's website. Does anyone know how much this tire weighs? I just want to get a ballpark idea of what the rim alone weighs. If the Goodyears weigh anything close to the Turanza's (which are 26 lbs), the rim is somewhere around 23-24 lbs.

 

Wheel and tire weight is definitely important.

It's just a bathroom scale, so the weights are approximate, but here is one pic with the stock coupe 18" rim, and another with the stock 225/45/18 Michelin Pilot Sport front with 70% tread.

On the same scale, if I remember correctly:
18" front 350z track rim + 225/45/18 Bridgestone Re040 with 80% tread = 44
18" rear 350z track rim +245/45/18 Re040 with 60% tread = 46
18" front coupe rim + 225/45/18 Pilot Sport with 80% tread = 49
18" rear coupe rim + 245/45/18 Pilot Sport with 30% tread = 50

 

First post here guys.
Last night my wife and I picked up a
2005 G35 Sedan to replace her 2002 Maxima GLE.
Sweet car, was going to wait for the 2006's in another 2 months
but the dealer offered us a great lease rate on the car and since
the 2006's aren't really changing (well Bluetooth added) we got the 05.

Anyway, tire/wheel weight was one of my first interests in this car.
Her 2002 Maxima's stock 17x7 wheels weighed 24.5 pounds. Yikes.
Switched to 18.5 pound Enkei's and it made a BIG difference in power,
steering, braking.

Now, to answer the question I quoted above.
Tirerack lists the NCT5's in 235/45/18's at 27 pounds each.
Strangely, they have two weights listed for the Turanza ER33's
One at 27 pounds one at 26 pounds.

So it appears the OEM 18" Sport Package rims on the 05 G35 sedan
weighs about 22-23 pounds. Not too bad.

But now time to find a good 18x8 inch aftermarket rim
that weighs under 20 pounds and a better tire that weighs
a couple pounds less too.

 

SSR Competitions

 

I think you will find that the 05' brakes stop faster with less fade and grabbieness than the Brembos on the < 04's. (If you break them in correctly!)

 

or, if you want to go with the oem look, the Z track forged wheels are the way to go....18.1lbs front and 18.6lbs rear......18x8 and 18x8.5 respectively.....got them on my sedan......sleeper looks, unsprung weight, less rotaional mass.........there's a set going for about 1,000 on the 350z forumn, check it out.....and no, there're not mine.........peace.

 

I also weighed the
2005 G35 sedan w/ sport package wheels and tires (Bridgestones) and
the scale said dead on 49 pounds.

For comparison there was a 2004 G35 Coupe with
18 inch wheels and the Goodyear tires there getting it's tires
changed (they were nearly bald) and even with bald tires
they weighed 49.5 pounds. So new it would have been at least
50.5 to 51 pounds.
So sedan's sport package wheels w/ Bridgestones weigh about
2 pounds less than coupes non-sport 18 inch wheels/tires.