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Old 01-29-2014, 10:46 AM   #1
Cammie 2011
 
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2014 1LE with comes with 305s on the rear ?

Hi all! I traded my 2012 2ss in for a 2014 1LE. I bought it and by the time we got it home it was dark. So as we put the car in the garage and were covering it, I looked at the tires and they are 305s on the rear. The normal 285s up front. Did I accidently get ZL1 rims and tires from the factory? The car is brand new and had 6 miles on it when we got it. The tires look great! I will be getting 305s on my white 1LE. Anyway I was wondering if anybody else has 305s on their 1LE from the factory. I will post pics later of the car and tires.
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Old 01-29-2014, 10:49 AM   #2
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Originally Posted by Cammie 2011 View Post
Hi all! I traded my 2012 2ss in for a 2014 1LE. I bought it and by the time we got it home it was dark. So as we put the car in the garage and were covering it, I looked at the tires and they are 305s on the rear. The normal 285s up front. Did I accidently get ZL1 rims and tires from the factory? The car is brand new and had 6 miles on it when we got it. The tires look great! I will be getting 305s on my white 1LE. Anyway I was wondering if anybody else has 305s on their 1LE from the factory. I will post pics later of the car and tires.
1 member a while back had 1 305 on the rear and the rest were 285s. Factory goof for sure.
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Old 01-29-2014, 11:19 AM   #3
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mine are 285s like they are supposed to be. must be a f--- up by the factory but the rim size is the same 20x11 as the ZL1, so only the tires are the wrong size. The handling package uses the square tires for a reason so if you track with those tires you will get more understeer
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Old 01-29-2014, 11:22 AM   #4
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You mention you are going to change the tire set up on the 2013. Are you not concerned that the handling of the car will be jeopardized with the larger tire? It seems that GM made a decision on the wheel tire combo of the 1LE to maximize handling. Why would be the benefit in changing that. I would have thought you would be taking the new car back to get the tires changed.
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Old 01-29-2014, 11:25 AM   #5
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1 member a while back had 1 305 on the rear and the rest were 285s. Factory goof for sure.
I think that happened to Suxhost too.
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Old 01-29-2014, 11:39 AM   #6
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my 13 has 285's all around I sold them to a member her and replaced them with the same size but I am running the Michelian pilot A/S 3's because she is my DD and I live in ohio so the f1 super car tires wont cut it.
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Old 01-29-2014, 11:42 AM   #7
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The Dealership put one 305 series on my 2014 1LE. I liked the look better of the 305 so I had them replace the other side also.
I will never race the car so I didn't care about the square set up.
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Old 01-29-2014, 11:57 AM   #8
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I do more car shows than track events. I would also buy two new rims to keep as spares just in case I see any track duty.
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Old 01-29-2014, 12:36 PM   #9
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Does anyone know the real answer why they put the 285's instead of the 305's in the back for the 1LE?
(i thought it was because its cheaper to go with a smaller tire. is it because the ZL1 is more $$$ so they put a bigger tire?)
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Old 01-29-2014, 12:42 PM   #10
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Does anyone know the real answer why they put the 285's instead of the 305's in the back for the 1LE?
(i thought it was because its cheaper to go with a smaller tire. is it because the ZL1 is more $$$ so they put a bigger tire?)
Better track capabilities.
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Old 01-29-2014, 12:43 PM   #11
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Does anyone know the real answer why they put the 285's instead of the 305's in the back for the 1LE?
(i thought it was because its cheaper to go with a smaller tire. is it because the ZL1 is more $$$ so they put a bigger tire?)
When touring or tracking your car, they're believed to handle better if all the tires have the same track width. Hence the 285's all the way around on a 1LE. I personally have 305's on the back, because I'll probably never track my car, and I like the "meaty" look.
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Old 01-29-2014, 12:56 PM   #12
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Does anyone know the real answer why they put the 285's instead of the 305's in the back for the 1LE?
(i thought it was because its cheaper to go with a smaller tire. is it because the ZL1 is more $$$ so they put a bigger tire?)
Less tire in the rear gives a more but neutral rotation in the turns.
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Old 01-29-2014, 01:20 PM   #13
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Old 01-29-2014, 01:22 PM   #14
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Sorry about the sideways pics!
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Old 01-29-2014, 05:11 PM   #15
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But the ZL1 is a "track" car and it has 305's
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Old 01-29-2014, 05:24 PM   #16
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But the ZL1 is a "track" car and it has 305's
It also has a lot more power than the SS, so understeer is not much of a problem. I'm guessing the 305s were selected because of that. With the SS, we need a little more help bringing the back end around.
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Old 01-29-2014, 06:04 PM   #17
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But the ZL1 is a "track" car and it has 305's
The ZL1 has more power, a better differential and better suspension than the 1LE and base vs base is $20K more.

Using a smaller width, 285 vs 305 tire is part of the "total package" that includes the larger sway bar we have and the revised rear shocks that help reduce understeer on the 1LE.

For YEARS autocrossers have used different width tires front and back to help increase front grip and decrease rear to help balance the handling of cars. The square 285/285 in similar in principal

If you want 305s toss in the Z/28 Torsen diff and you should be golden (for a price $$)

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Old 01-29-2014, 06:49 PM   #18
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mine are 285s like they are supposed to be. must be a f--- up by the factory but the rim size is the same 20x11 as the ZL1, so only the tires are the wrong size. The handling package uses the square tires for a reason so if you track with those tires you will get more understeer
The purpose of the square setup and the stretched 285's in the rear is to help reduce understeer.
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Old 01-29-2014, 07:16 PM   #19
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so if you put the 305 on will we have to recalibrate the the speedometer?
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Old 01-29-2014, 07:22 PM   #20
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so if you put the 305 on will we have to recalibrate the the speedometer?
Only if the diameter of the tire changes significantly, not the width.
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Old 01-29-2014, 09:39 PM   #21
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so if you put the 305 on will we have to recalibrate the the speedometer?
The dealer that switched my tires to 305's said that I didn't so you don't.
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Old 01-29-2014, 09:44 PM   #22
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I got an extra rear 1LE with a little scuff for sale
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Old 01-29-2014, 10:34 PM   #23
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That sounds like a mistake to me or dealer installed tires. All 1LEs should come with 285s all around for the reasons mentioned already. If you are going to track at all and not do any other mods to suspension, I'd say swap those for 285s. For the street it probably matters less and depends on how heavy your foot is and also if you plan to drag race at all. :-) If I drive "normally" I usually don't get any wheel spin. But if I plant my foot, she gets all over the place (with all the computer controls on).
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Old 01-30-2014, 03:04 AM   #24
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Gotta be honest...unless you're a phenomenal driver and can really take a car to the absolute limit, don't think you're going to notice a huge difference. I bought a second set of track wheels and they came off a ZL1, 305s in the rear... Not going to sweat it one bit. Everything everyone said above is correct, I just don't think the 2 cm of rubber is going to cause most drivers fits. Congrats! You got a more expensive tire for free!
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Old 01-30-2014, 03:23 AM   #25
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not to chime in late here just was going to say this is a video from Chevrolet Camaro Chief Engineer about the 1LE package he talks about the tires in the first min. of the video.
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