18' wheels to 19' wheels

mhcoss · 03-06-2012, 06:06 PM

Quote:

Originally Posted by 2011 Nismo#91

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.

Uhh.

Kinda.

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

2011 Nismo#91 · 03-07-2012, 07:34 AM

Quote:

Originally Posted by mhcoss

Uhh.

Kinda.

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

Quote:

Originally Posted by 2011 Nismo#91

...a lower speed reading...

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

_ace_ · 03-07-2012, 07:12 PM

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.

Csquared · 03-07-2012, 09:10 PM

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.

akaaronkatz · 03-11-2012, 05:15 PM

Quote:

Originally Posted by Csquared

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.

That looks amazing!!!

gy954 · 03-11-2012, 08:54 PM

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.

03-11-2012, 08:54 PM	#21 (permalink)
gy954 Base Member Join Date: Mar 2012 Location: Sonoma County, CA Posts: 163 Drives: 2011 370Z Rep Power: 181	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.

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03-07-2012, 07:12 PM	#18 (permalink)
_ace_ Base Member Join Date: May 2011 Location: USA Posts: 140 Drives: 370Z Rep Power: 14	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.

03-07-2012, 09:10 PM	#19 (permalink)
Csquared Enthusiast Member Join Date: Mar 2010 Location: Hong Kong Posts: 302 Drives: 09 Nissan 370z Y 7sp Rep Power: 15	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.