: 275/40 or 275/35?



ichpen
06-26-10, 01:27 PM
Gents,

Looking to get some temporary tires before the 19" purchase.

Probably the Sumi's HTRZIII as they seem to be the best value for a summer tire.

Question on sizes, a 275/40 rear, 245/45 front seems to be an ideal drop in replacement on the 18" stock wheels (according to the tire calc) vs. 275/35 and 245/40 combo that people are running. Is this a better way to go?

I'm lowered a bit and will likely see at least a track day or two before I replace these.

thebigjimsho
06-26-10, 07:13 PM
Gents,

Looking to get some temporary tires before the 19" purchase.

Probably the Sumi's HTRZIII as they seem to be the best value for a summer tire.

Question on sizes, a 275/40 rear, 245/45 front seems to be an ideal drop in replacement on the 18" stock wheels (according to the tire calc) vs. 275/35 and 245/40 combo that people are running. Is this a better way to go?

I'm lowered a bit and will likely see at least a track day or two before I replace these.
People who run the 245/40 275/35 setup on 18" wheels either do so because the tire they want doesn't come in the right size or their vain minds just want any drop they can get.

Go with the 245/45 275/40 and do it right...

UnsafeAtAnySpd
06-26-10, 07:50 PM
I have 265/35/18s mounted on my stock wheels right now. The size difference is obvious even off of the car.

shadybx7
06-27-10, 02:28 PM
i have the HtzIII 275/40.. the first 20 miles sucked.. they felt pretty greasy and i was regretting them..however after they wore a little i realized they are leaps and bounds better than my boyricer KDWs.. sticky with a very firm sidewall which helps because i did it wrong.. so far i have nothing but good things to say.. much quieter then my KDWs and much more predictable.. btw the KDws still had at least another 5k in them.. blew out the sidewall... im not lowered so i cant help you with that aspect but i doubt there will be an issue
http://i549.photobucket.com/albums/ii384/shadybx7/june26th/DSCF6472.jpg
http://i549.photobucket.com/albums/ii384/shadybx7/june26th/DSCF6473.jpg

c4ss
06-27-10, 06:19 PM
Those are nice Will. I can't wait to see them in person. I need new tires too...

hXc95SLS
06-28-10, 07:38 PM
Those are nice Will. I can't wait to see them in person. I need new tires too...

Speaking of seeing them in person when is the next NJ meet?

whisler151
06-28-10, 08:18 PM
People who run the 245/40 275/35 setup on 18" wheels either do so because the tire they want doesn't come in the right size or their vain minds just want any drop they can get.

Go with the 245/45 275/40 and do it right...

Jim's opinion = Fail

rjwz28
06-28-10, 09:24 PM
If you don't mind the speedometer difference and slightly stiffer ride, the tires with the lower aspect ratio shouldn't cause any other issues. The diameter decrease actually will create slightly lower gearing and lower unsprung weight, which can contribute to overall performance, as seen on Pedders' 2010 Camaro SS.

thebigjimsho
06-29-10, 02:42 AM
Then just go with 275/15 18s and call it a night...:bouncy:

rjwz28
06-29-10, 02:48 AM
Oh come on, don't be ridiculous :histeric: you get the point. There is nothing wrong with replacing a 275/40-18 with a 275/35-18. I believe there is a broader range of tire selection in that size, and there aren't any negative results from that change other than maybe a slight difference in ride quality. If you don't mind that, go for it. Why not?

thebigjimsho
06-29-10, 02:55 AM
And you won't be able to hit 164...

rjwz28
06-29-10, 07:34 AM
Top speed is in 5th anyway. If your top end drops from 164 to 160 but you gain a bit out of the hole, are you really going to care? Plus you can bump up the rev limiter an extra 100 rpm when you're fixing your higher speedo reading. Or just add a blower and shift to 6th to continue pulling past 160 :lildevil:

thebigjimsho
06-29-10, 07:37 PM
boring...

Stepside
06-29-10, 09:42 PM
Technically, any tire on your stock V1 wheel larger than a 265 is beyond the engineered spec for an 8 1/2" width rim
and any tire less than 26.7" in diameter will turn more revolutions/mile, thus reducing the tire mileage and adding more miles to the odometer,
while reducing resale value of your vehicle, provided you do not have the computer recalibrated.
Not to mention, should you get into an accident that resulted in a court case,
the defendant might have to try to justify that the tire size/rim width did not contribute to the accident,
even though it was not engineered for it. Sometimes the truth sucks . .

rjwz28
06-30-10, 01:22 AM
That's true. My opinion was based more on the diameter of the tire, not the width, but that is still a valid point. I just don't understand why everybody gets all worked up when somebody puts a tire on their vehicle that isn't exactly the same diameter as factory. I know that it can alter the characteristics of your vehicle, but that isn't always a bad thing. Recalibrate for the tires and go play. As far as the width goes, I'd prefer to mount a 275 on a 9 or 9.5" rim, not an 8.5. And the argument for the accident and court can apply for any performance modification you make to a car, depending on the situation. Wise words, but I just don't believe it is that big of a deal.

MauiV
06-30-10, 01:29 AM
274/40s all the way around at 38-39 PSI to keep the side walls up and it fills the wheel well gap a bit better IMO

http://i173.photobucket.com/albums/w52/jdinmaui/11%20/Cadi009.jpg

rjwz28
06-30-10, 01:46 AM
Looks good :) nice V

UnsafeAtAnySpd
06-30-10, 02:03 AM
274? Custom order? :P

No issues with rubbing up front? 275s would be nice...

rjwz28
06-30-10, 02:20 AM
274? Custom order? :P

No issues with rubbing up front? 275s would be nice...

Nah you just take the 1 mm off with a grinder on the inside of the tire to get to 274 LOL I saw that but thought I'd leave it alone :D

RADARB8
06-30-10, 03:20 AM
274/40s all the way around at 38-39 PSI to keep the side walls up and it fills the wheel well gap a bit better IMO

http://i173.photobucket.com/albums/w52/jdinmaui/11%20/Cadi009.jpg

Yea, that V looks sharp..Raven Black and chrome wheels are tits..but 275's ain't gong to fit up front:alchi:At the moment, just temporaily i am running
285/35/18's Fulda Carat 101Y rated and Pirelli 245/40/18 99Y rated fronts.
The tread pattern is very similar...It's not my daily driver, and i don't roadrace
Still they handle well and...As how noisy they are, i don't hear much with my bad hearing and rear turbo, so i can't elaborate on the noise level:lol:

ichpen
06-30-10, 09:40 AM
Technically, any tire on your stock V1 wheel larger than a 265 is beyond the engineered spec for an 8 1/2" width rim
and any tire less than 26.7" in diameter will turn more revolutions/mile, thus reducing the tire mileage and adding more miles to the odometer,
while reducing resale value of your vehicle, provided you do not have the computer recalibrated.
Not to mention, should you get into an accident that resulted in a court case,
the defendant might have to try to justify that the tire size/rim width did not contribute to the accident,
even though it was not engineered for it. Sometimes the truth sucks . .

Its true though in my case they'd have a veeery long list of modifications that may have contributed to an accident before they even look at the tires.

Right now though I need something temporary. As my falkens rt615s as great as they are are totally slick. Still grip like crazy though. :)

rjwz28
07-01-10, 04:28 AM
Its true though in my case they'd have a veeery long list of modifications that may have contributed to an accident before they even look at the tires.

Right now though I need something temporary. As my falkens rt615s as great as they are are totally slick. Still grip like crazy though. :)

What size RT615s?