315 tire and wheel weight vs 245 tire and wheel weight - Forums at Modded Mustangs
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post #1 of 26 Old May 26th, 2013, 08:38 PM Thread Starter
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315 tire and wheel weight vs 245 tire and wheel weight

I'm considering going with 315s on the rear and the 275s up front. When I was getting my gears installed the guy who did it has an 02 GT and says he hates his 315s made the car feel like it lost 30hp it just feels slow. Hearing that makes me wanna keep my stock tires. What is the weight compared to 315 nitto nt555s and 245 nitto nt555s? (Which I have now) hoping the boys with the 315s chime in

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post #2 of 26 Old May 26th, 2013, 08:48 PM
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The difference he was talking about was probably just the added grip. Grip makes you feel slower (tires won't spin) but in reality it actually makes you faster for the same reason. My friend went through the same thing when he got DR's on his auto. Felt slower to him at first but it hooks like a mother and is fast as hell with 4.10's. He was used to being able to spin through 1 and 2. Now, if you do get 315's (I LOVE mine), don't get Sumitomo's or you will have no better traction than you do now with your stock 245's. The Sumitomo's suck, ask me how I know. The added meat in the back totally transforms the look of the car for the better though. I'm just getting ready to burn off the rest of my Sumitomo's off and put on some new Nitto's




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post #3 of 26 Old May 26th, 2013, 08:49 PM
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Well I don't know the exact weight but I can say that I felt a difference. Nothing too extreme though. The car does feel more stabile and predictable in the corners which is nice.

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post #4 of 26 Old May 26th, 2013, 08:54 PM Thread Starter
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Those 315s are so sexy. How much does it weigh compared to the 245?

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---------- Post added at 07:54 PM ---------- Previous post was at 07:49 PM ----------

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Well I don't know the exact weight but I can say that I felt a difference. Nothing too extreme though. The car does feel more stabile and predictable in the corners which is nice.

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Hm hopefully someone knows. I don't wanna add like 100 pounds with bigger tires and wheels lol

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post #5 of 26 Old May 26th, 2013, 08:58 PM
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It's barely noticeable between my front 17x8-245 and 17x10.5-315. Minimal weight difference. Definitely not something you will notice


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post #6 of 26 Old May 26th, 2013, 09:01 PM Thread Starter
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It's barely noticeable between my front 17x8-245 and 17x10.5-315. Minimal weight difference. Definitely not something you will notice


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Good deal man. With a 100 shot of zex I probably won't feel it

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post #7 of 26 Old May 26th, 2013, 09:42 PM
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Is even good to run 245's up front and 315's out back?

Might be a dumb question -_-
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post #8 of 26 Old May 26th, 2013, 09:51 PM
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i run 265's up front and 285's out back my cars feels so much better than when i had 245's all the way around,

ill probably drop to a 255 up front and keep the 285's out back maybe go to a 28" tall tire instead of the 26 but to me its the perfect set up on a stockish powerd car 240rwhp-280rwhp i have the nitto nt555s (oh and 285 or 315 what ever you choose will both hook a hell of a lot better than the 245's you have now)



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post #9 of 26 Old May 26th, 2013, 09:51 PM
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I did the weighing between a 17x8 with 245/45/17 and a 17x10.5 with 315/35/17, but can't remember the exact numbers. Think the 17x8 was around 65lbs. It definitely wasn't drastic. Wheels will usually weigh between 25-35lbs and same for tires. You do have to remember though that you are adding rotational mass. I've heard that the ratio of rotational mass to dead weight is 1:10. So 1 extra pound of rotational mass equals an additional 10lbs of dead weight.

With the above being said my car felt much slower on the street with 17x10.5 and 315/35/17 BFG drag radials vs 17x8 255/40/17 BFG KDW II street tires. At the track the 60ft improved by .2, but the car ran the same time as spinning on street tires. I got rid of them after two weeks. Picked up a set of 15x8 Weld Prostars which weigh 8lbs each with 275/50/15 BFG drag radials and the car went .36 quicker in the quarter. I do love the look of a wide wheel in the back, but I do not want the car to feel slower.


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post #10 of 26 Old May 26th, 2013, 09:53 PM
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Originally Posted by Black04Pony View Post
Is even good to run 245's up front and 315's out back?

Might be a dumb question -_-
Sure it is. I do. I hated 275's up front. They pulled and made the steering sluggish. So I switched back to 245's up front and the car feels great.

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post #11 of 26 Old May 26th, 2013, 09:56 PM
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I'm contemplating going from 245 generic tires to 255 Nitto's in the front to help with some slight understeer


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post #12 of 26 Old May 26th, 2013, 10:16 PM Thread Starter
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Damn this is a hard choice everyone saying they felt slower lol. I never hit the track due to two jobs so would 315s even be worth it for me? I'm gonna be running a 100 shot next paycheck ..

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post #13 of 26 Old May 27th, 2013, 09:29 AM
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Will 315's be alright with 17x9's for me?, Just the rear..
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post #14 of 26 Old May 27th, 2013, 10:56 AM
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315s on a 9" wheel isnt recommended just because it will be bulging. Id go no bigger than 295s if its street driven. Just realize, there are people running 9s/10s with 275s. Yes they were slicks....but wider doesnt necessarily mean more traction. Most the people here only do a staggered setup like this for the looks on this site. Even though they think it does something performance wise

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post #15 of 26 Old May 27th, 2013, 11:24 AM
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Get the 315's FTW!!!

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post #16 of 26 Old May 27th, 2013, 11:47 AM
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If your car only has minor bolt ons then it will be noticeably slower. You are adding both unsprung and rotational weight; both of which have way more effect than sprung weight.
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post #17 of 26 Old May 27th, 2013, 12:00 PM
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Quote:
Originally Posted by Froush View Post
315s on a 9" wheel isnt recommended just because it will be bulging. Id go no bigger than 295s if its street driven. Just realize, there are people running 9s/10s with 275s. Yes they were slicks....but wider doesnt necessarily mean more traction. Most the people here only do a staggered setup like this for the looks on this site. Even though they think it does something performance wise
Thanks..
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post #18 of 26 Old May 27th, 2013, 12:06 PM
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i know a guy that had a supra ran low 10s and he ran 295's on it so biggers not always better... when i go to a dr im probably gonna just keep with the 285 but with a little taller sidewall



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post #19 of 26 Old May 27th, 2013, 12:12 PM
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The taller the tire the shorter it will make your gear ratio feel. So say you habe 4.10s and use a 28" tall tire it will make it more like a 3.73 gear and slow you down. Depending on your setup, a taller tire may hurt your times

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post #20 of 26 Old May 27th, 2013, 12:17 PM Thread Starter
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Wow screw this I'm keeping the stock tires!



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