Which tire size for '12 R-Spec?

[kdjlaw]

I need to replace all four tires on my 2012 R-Spec sedan. The tires that came on it are 235/45/19. Tirerack.com lists an additional OE tire size, 245/45/19. There are more choices for tires in the 45 size. Is it OK for me to get the 245/45/19's? Any drawbacks?

 

[JasTheAce]

I need to replace all four tires on my 2012 R-Spec sedan. The tires that came on it are 235/45/19. Tirerack.com lists an additional OE tire size, 245/45/19. There are more choices for tires in the 45 size. Is it OK for me to get the 245/45/19's? Any drawbacks?

Speedometer will be a hair off bit you will have more traction. 245 is an optional dealer installed (summer) tire on r spec I believe.

 

[EXBMWGUY]

Speedometer will be a hair off bit you will have more traction. 245 is an optional dealer installed (summer) tire on r spec I believe.

Correct. Several here have changed to 245s and I will soon.

 

[StangKiller]

I plan on swapping to the 245s next summer when my 235s wear out. Speedo shouldn't be an issue unless you go to a different profile (like 40 instead of 45)

 

[shagnat]

I plan on swapping to the 245s next summer when my 235s wear out. Speedo shouldn't be an issue unless you go to a different profile (like 40 instead of 45)

Exactly! Speedo will only vary if you change to a taller or shallower tire. Width (which the 235/245 references) does not change the speedo at all.

 

[brfatal]

I plan on swapping to the 245s next summer when my 235s wear out. Speedo shouldn't be an issue unless you go to a different profile (like 40 instead of 45)

That's false. The sidewall size is not a set number, it's a ratio. A 245/45 means that the section width is "245mm" and the sidewall is 45% as tall as the tire is wide. Thus a 235/45/19 will have a smaller diameter (and more importantly circumference) than a 245/45/19.

Exactly! Speedo will only vary if you change to a taller or shallower tire. Width (which the 235/245 references) does not change the speedo at all.

Again that's wrong. It's very harmful to others to spread misinformation when you don't know what you're talking about.

OP, it's also worth noting that there are a few effects of increasing tire width. You do increase grip, but be aware at the same time you're also increasing rolling resistance and reducing hydroplane resistance when compared to the same tire of a smaller size. The later won't be that huge though, just be aware that you may see some lose of gas mileage.

 

[Potty_Pants]

That's false. The sidewall size is not a set number, it's a ratio. A 245/45 means that the section width is "245mm" and the sidewall is 45% as tall as the tire is wide. Thus a 235/45/19 will have a smaller diameter (and more importantly circumference) than a 245/45/19.



Again that's wrong. It's very harmful to others to spread misinformation when you don't know what you're talking about.

OP, it's also worth noting that there are a few effects of increasing tire width. You do increase grip, but be aware at the same time you're also increasing rolling resistance and reducing hydroplane resistance when compared to the same tire of a smaller size. The later won't be that huge though, just be aware that you may see some lose of gas mileage.

really didn't want to comment , since i'm not an expert on the subject.

just because you increase the size of the tire... doesn't mean it will reduce gas MPG... its likely and probable ... however you can mount a tire that weighs less then original and the mpg difference + or - would be a null point.

ppp

 

[Fast55]

A gift for everyone here:

http://www.dakota-truck.net/TIRECALC/tirecalc.html

Best tire size/gear ratio tool I've found. Very helpful.

Any questions about it, just let me know.

 

[SNSN]

Any thoughts on which tires you'll replace them with?
I hate the Conti ProContac which came on my car ...

 

[RSPEC429]

If Hyundai/dealer installs 245s brand new, you have nothing to worry about. I'm planning to move to 245s whenever these Contis wear. My top pick right now is the new Michelin Pilot Sport A/S 3s. From what I've heard, these tires are out performing some summer tires.

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Help support this site so it can continue supporting you!

 

[EXBMWGUY]

If Hyundai/dealer installs 245s brand new, you have nothing to worry about. I'm planning to move to 245s whenever these Contis wear. My top pick right now is the new Michelin Pilot Sport A/S 3s. From what I've heard, these tires are out performing some summer tires.

My choice also. My Conti Pro tires can't wear out too soon.

 

[brfatal]

really didn't want to comment , since i'm not an expert on the subject.

just because you increase the size of the tire... doesn't mean it will reduce gas MPG... its likely and probable ... however you can mount a tire that weighs less then original and the mpg difference + or - would be a null point.

ppp

I have person experience with this. My WRX had 3 sets of wheels that vary from 16 lbs each to 24 lbs each. I get the same gas mileage no matter which set of wheels I use. Any increase in effort to turn the wheel is likely offset by the extra energy the wheel carries that will allow the car to coast better on heavier wheels. It's a similar affect of running a stock flywheel versus a lightweight one, but less drastic as long as you don't look at the handling and braking aspects.

It's the rolling resistance that will affect gas mileage. With a wider contact patch you're going to get more rolling resistance.

 

[Vince2]

If Hyundai/dealer installs 245s brand new, you have nothing to worry about. I'm planning to move to 245s whenever these Contis wear. My top pick right now is the new Michelin Pilot Sport A/S 3s. From what I've heard, these tires are out performing some summer tires.

The press reviews for this tire have been nothing less than spectacular...I'm waiting for my favorite sources (tirerack.com and Consumer Reports) to review the tire. I'm giddy with anticipation...well as giddy as one can be about an automobile tire.

 

[StangKiller]

That's false. The sidewall size is not a set number, it's a ratio. A 245/45 means that the section width is "245mm" and the sidewall is 45% as tall as the tire is wide. Thus a 235/45/19 will have a smaller diameter (and more importantly circumference) than a 245/45/19.

My bad - based on the calculator the difference is 0.77mph at 60mph... lol

BTW, if you went from a 235/45/19 to a 235/40/19 the difference would be 2.10mph at 60mph...

So I'm pretty sure I was actually correct in saying the speedo shouldn't be an issue unless you move to a lower profile tire. But whatevs.

 

[homeofstone]

That's false. The sidewall size is not a set number, it's a ratio. A 245/45 means that the section width is "245mm" and the sidewall is 45% as tall as the tire is wide. Thus a 235/45/19 will have a smaller diameter (and more importantly circumference) than a 245/45/19.



Again that's wrong. It's very harmful to others to spread misinformation when you don't know what you're talking about.

OP, it's also worth noting that there are a few effects of increasing tire width. You do increase grip, but be aware at the same time you're also increasing rolling resistance and reducing hydroplane resistance when compared to the same tire of a smaller size. The later won't be that huge though, just be aware that you may see some lose of gas mileage.

Ditto, glad you posted the correct info. I worked for Goodyear Tire Corporation for 4 years and was going to chime in and state the same things you did.

 

[Fast55]

What about 255/40/19? Virtually the same diameter to keep the speedo and electronics happy (1 mph at 90), but about 3/4" wider. Lot's of choices from full on summer performance to touring.

 

[shagnat]

What about 255/40/19? Virtually the same diameter to keep the speedo and electronics happy (1 mph at 90), but about 3/4" wider. Lot's of choices from full on summer performance to touring.

What would be the purpose. The speedo won't be affected by a wider diameter tire. And you only need one set of tires and there are plenty of good options w/out having to make a tire purchase even more complicated and expensive.

 

[wd40]

I need to replace all four tires on my 2012 R-Spec sedan. The tires that came on it are 235/45/19. Tirerack.com lists an additional OE tire size, 245/45/19. There are more choices for tires in the 45 size. Is it OK for me to get the 245/45/19's? Any drawbacks?

I was thinking the same. Not only more choices but better pricing. Speedometer accuracy will be affected but not enough to get you a speeding ticket.

View attachment Tire Size Calculator .pdf

 

[JasTheAce]

What would be the purpose. The speedo won't be affected by a wider diameter tire. And you only need one set of tires and there are plenty of good options w/out having to make a tire purchase even more complicated and expensive.

255/40 won't fit on the stock rims generally.

 

[brfatal]

Yep. 255s are too wide for the wheel. You may get some sidewall slop and the manufacturer warranty on the tire will be voided the second it's mounted.