Hi... I have an 06 G35 6MT... I can't even begin to tell you how much effort, research, struggle and so forth I went through choosing replacement tires for my car... I really disliked the ride of the original Bridgestone Potenza's that came on the car... I eventually settled on the Kumho Ecsta's and I've LOVED them... The Bridgestone felt and sounded like I was riding on round stones... The Kumho's are much better, IMO... I am starting to think about buying a new G, again a 6MT... I went online tonight and the first thing I did was checked the tire size... The rear is the same as my car (245/40/19)... But the fronts have been changed from 225/40/19 to 225/45/19... So what's the problem you ask??? KUMHO doesn't make a 225/45/19... Dang... What other tire size could I get to work instead of the 225/45/19???? I checked Tire Rack and they only show 8 tires in the 225/45/19 size and FIVE of them are Bridgestones... Nope... No thanks... Why would Infiniti choose such a poorly supported tire size???? Anyway, I'm not smart at what varied tire sizes can be used instead of the OEM sizes... Any help??? Thoughts???? thanks.. bob...

 

because they have a relationship with bridgestone and they know most people will just buy the exact same tire over and over again.

So based on your sentence im a little confused about what wheel size you have and what model year car you are buying.

Are you on OEM 19-inch wheels or some other wheel? I would think a 225/40 or a 235/40 would be just fine for the front. I'll let you search to see if the Kumho comes in those sizes.

 

Hi... Yeah, 225/40 is what my current 06 6MT has for OEM front tire size and yes, Kumho makes that size and I have them on my car now... But I'm considering trading the 06 for a new 09 or 10... And on at least the 09 (on their website) they show that the front tire is now (OEM) a 225/45 (instead of the old 40).. If 225/40's would work, I'd be buying them maybe even as soon as I buy the new car... Personally I would whine at the dealer for putting such poor riding tires (IMO) stock on the car and would ask them to knock 800 off the price (not asking for Michelin here, just Kumho) so I could put decent tires on it...

But you think the 225/40's would work... Why do you think they changed from a 225/40 to a 225/45??? What does that do for handing or whatever??? And what would I lose if I instead put 225/40's on it????

thanks... bob...

 

you can use this link here to find out what other tire sizes are close enough for you to work.

http://www.1010tires.com/TireSizeCalculator.asp

 

We've also seen 245/35-19 front with the 245/40-19 rear. Lots of options there as well.

 

Hi... Can anyone help educate me as to what drives a car company to make a little tweek like changing a front tire size from 225/40/19 to 225/45/19... If I did the math right I think that makes the tire about an inch taller overall... Is it for looks?? For handling??? Or as one person suggested, to limit the availability of tires such that we are forced to a small number of vendors with whom Infiniti might have some business arrangement?? I would never change tire sizes if it would harm something or make the car dangerous or whatever... That's what I need to learn about... Or is it sort of "as long as it fits and doesn't rub, you're ok"...

Thoughts??? thanks.. bob...

 

you can run 245/40/19 in the front of the g37 as well. Pair it with a 275/35/19 on the OEM wheels and you'll have a great combo

 

BTW, my guess of why they went to the 225/45/19 in the front is due to the added weight of the g37. The 225/45/19 bridgestone has a load index of 92 while the 225/40/19 has a load index of 89.

 

I see... How would one determine whether going with a 225/40/19 on the front of a new G37 would be dangerous or at least not wise??? It's a big deal to me because I am really leaning toward buying a new G37 but I simply won't if I am stuck using BridgeSTONES... Tire Rack shows only 8 tires at the 225/45/19 size and 5 are Bridgestones... By contrast they have three pages of tires for the 225/40/19 including the Kumhos I use and really like now...

I hear folks all the time talking about putting this or that non-standard size tires on their vehicles... I am just trying to get smarter so I can make good decisions if I decide to buy a new G37...

thanks.. bob..

 

If you don't want to run 225/45/19, then go with the 245/40/19 I suggested above. I don't recommend the 225/40/19 at all on a g37. I don't even like that tire size on the g35 coupe. The front of the coupe feels under tired and handles much better with a 245 in the front

 

Wow... That's interesting... If I could use 245/40/19 (same as rear) I could actuallly rotate the tires front to back... That would be handy... And you're confident I assume that there's no clearance issues or anything of the sort with using a 245/40 on the front??? I would guess not since that is in the ballpark of the same size as the 225/45... Thanks for the advice... bob..

 

I would not rotate them, the rear wheels are wider than the front

 

since the rears are wider and you want to rotate, I would rotate the tires and keep the rims where they are.

 

Really??? Wider wheels in the back?? What size are we talking about??? I thought all the wheels were 19 x 8...

thanks... bob...

 

The rears are 19x8.5