18' wheels to 19' wheels
 

I've thought about going from the stock 18' wheels to 19' Avant Garde M368's. Has anyone had any issues with this and would going from 18' to 19' wheels mess up my mileage odometer? All feedback is appreciated, Thanks :)

Go with the size of OEM tires then you are good to go.

Otherwise, tech at the tires shop should know. :tiphat:

Thanks, but the smallest size are 19's i believe.

When you get bigger wheels you usually get thinner tires, so the overall circumference of the tire stays the same, same rotational ratio, blah blah blah. If you get a much bigger tire then yeah it can throw off your tachometer. Like alcheng said, shop techs can fix it for you.

Do a serach for tire calculator size, it will give you the sizes comparables with your current ones. However the Sport Pkg size on the Z is 19".

19" is perfectly fine, your tach will be unchanged (engine RPM stays the same). Your Speedo will be off. I believe the bigger the tire the lower it reads smaller higher. Bigger circumference leads to less revolutions of the tire and a lower speed reading. Its usually a minor change ~2mph you can calculate it or find an online tool, its simple math.

yah, 19's are fine. the 368's only come in 8.5" and 9.5" no? will still work for our stock tire sizes, but just wondering.
i think the offsets were like 35/40 or something so you'll need spacers for the rear for sure.

anyone know if there are sufficient cavities between the lug bores on the disc to support bolt-on spacers? :)

i was looking at getting them for my G (dd) for snow setup.

op-i checked out avantguard's site and the 19x8.5 spokes protrude past the lip for caliper clearance. that means if you take your car to an auto wash the rails could scratch your spokes.

just thought i put that out there since now i dont think i want to use these as my winter set as i may need to take my G to the manned autowash in the winter. this winter was very mild so i was able to wash my car at home, but usually it's 3months of sub freezing temps.

M368 - Avant Garde Wheels

check out the front genesis pict to see wat i mean.

Here is a tire size calculator:

LINK

You are aware the 370Z comes in 18's and 19's right? It's a matter of the tires that make it work well with keeping it in check with the Spedometer. It's called plus sizing. 245-40-19 and 275-35-19 or 285-35-19's will do the trick as these are what the Sport package and Nismo Z's use.

In case of car wash, you can always go to a coin wash, or some drive thru that they don't have rail. :rolleyes:

shut up smart arse. :tup:

:bowrofl: :bowrofl:

Sorry dude, I don't use my brain too often. :icon18:

:bowrofl:



so does anyone know if the M368's disc have voids/cavity between the lug bores? :confused:

Uhh.

Kinda.

If your tire is a larger diameter your speedometer is going to read slightly lower then your actual vehicle speed.

I think that's saying the exact same thing, not "Kinda."

Get a decent GPS system to check your speed. Get the percentage error of the OEM baseline at highway speeds before you start. The whole calculation is a simple ratio, so you can just increase or decrease the overall diameter by any percentage to change your speed reading up or down by that percentage. Mine read a few percent high on the OEM tires and wheels.

You can probably change the tires and rims and choose the size carefully to make it read closer to true that it did from the factory if you care much about it.

One of the better calculators: Tire size calculator
There was another I liked, but I can't seem to find it right now.

I have them in 20s. and as someone mentioned earlier yes they stick out in the front for me. Mine are 20x10 + 20 though.

Running 285/30/20 and 255/30/20. The rolling is a bit smaller than my stock 18s but speedo is basically fine.

Here is a photo. http://a6.sphotos.ak.fbcdn.net/hphot...97627490_n.jpg

That looks amazing!!! :yum:

19" Downside
 

My 2011 370Z came with 19" tires. The ride is harsher than you will experience with 18" wheels. This is because the sidewalls of the larger tires are thinner, hence have less flex.

It's all just for flash; there is no performance or handling benefit to be had from larger wheels. In fact, handling can be degraded. So if you really really like the look do it. Just be aware of the downsides.