PedroP

iTrader: (2)

For anyone who has replaced their stock wheels with +1 or +2 diameter custom wheels, I was wondering if there was any consideration given to the stock spare tire after you have these wheels installed. I have a 09 G37x sedan with stock 17” wheels and was considering up sizing to a set of 19” rims. Given the fact that the stock mini spare tire is only 17”, I don’t imagine it would be a good idea to put this wheel into service with the larger diameter rims installed should you ever get a flat tire and have to travel any appreciable distance to get it fixed, especially with an AWD vehicle. Perhaps I shouldn’t be concerned with this and I will learn that it is no big deal but in case it is, I was wondering what others had done in this situation.

GxS

iTrader: (1)

pedro, dont worry about it. just as long as the rolling diameter of your aftermarket wheels match the rolling diameter of the spare tire, your car will be fine.

EnviedG35

iTrader: (2)

17" spare refers to the wheel size, not the overall diameter of the tire. Even with larger wheels, your sidewall will get shorter to make up for the same size diameter tire. Using the spare wont be a problem.

soundmike

iTrader: (6)

Not to mention, technically Infiniti only recommends using the spare for 50 miles at no more than 50mph.

hispeed-lowdrag

iTrader: (7)

like Envied said, the overall diameter of the wheel+tire will (should) remain the same. if your new wheels/tires are bigger than OEM the larger problem is the fact that your speedometer will be wrong

PedroP

iTrader: (2)

Thanks everyone for the informative replies. I was hoping that I didn't need to buy an extra wheel and tire given the price of Volk wheels which I some day hope to use for this mod.

Black Betty

iTrader: (60)

I'm pretty sure (too lazy to go check right now) that the OEM donut spare tire is not the same diameter as the front or rear wheels on the coupe with sport package. It doesn't need to be. It clearly says it is designed only to be driven slowly and for short distances in an emergency. In this instance it doesn't matter if the spare isn't the same diameter as the wheel it's replacing.

If you are driving more than 45 MPH or more than a few miles to the nearest tire shop on a donut spare tire, you're doing it wrong.

freesurfer

I thought we could drive 50mph for 50 minutes with using these donuts correctly. And maybe longer. What am I doing wrong?

That are the limitations of the dount tire? Shoud be a striaght-anwser. I'd suspect that I'l be using the donut tire sometime and consider needing a tube tire sonehing in my future.

soundmike

iTrader: (6)

50 miles, no more than 50mph, at 60psi.

Black Betty

iTrader: (60)

I see the 50 MPH in my owner's manual (thought it was 45). But where are you guys getting 50 miles from? There's now way I'd drive 50 miles on a donut spare.

Also, how many of you have ever checked the pressure in your spare to makes sure it's properly inflated?

Neal@tirerack

iTrader: (2)

Keep the correct outside diameter to what you have now.