[1ssa_camaro]

Hey guys I just got some new wheels and tires. They’re 20x10.5 with 305/35/20 Nitto nt555R in the rear and 20x9.5 nitto nt555 g2 275/35/20 in the front.

Before installing them I rerouted the wiring harness how everyone recommends to do. After the first drive the traction control light keeps coming on. Is there a way to remove this. Took it out for a spin about an hour later to see if the issues resolves but still there.

I’ve seen some people run this setup perfectly fine. They just moved the wiring harness and drove fine.

I’ve seen that some people say that it removes in a day or two or others unplug their battery for 5-20 mins. New wheels and tires do have tmps sensors as that light has not come on.

Any recommendations. Moving down tire sizes to a 305/30 is not an option as of now. Thank you.

[arpad_m]

This was discussed several times, your combination of 275/35/20 fronts with 305/35/20 rears introduced a new ~3.3% front/rear bias and even inverted the rake.

I don't know the exact tolerance thresholds for the ABS and Stabilitrak, but it's somewhere around 3%, which means you are very close, and depending on tire pressure and the exact height of your Nittos, the bias may only trigger these errors occasionally. Maybe others are straddling the threshold with a bit more luck, adding extra pressure up front and letting air out in the rear, or running different tires that have a slightly different outer diameter.

Since you ruled out the proper fix from the get-go, what you can do is up your front size to 285/35/20 and add 3-5mm spacers to clear the strut perches. Although not ideal for a 9.5" wheel, this will bring the bias down to 2.2% and you will be fine.

[DorsoDuroJohn]

so 285/35/20 and a 305/35/20 would have worked for the OP?

Likewise 285/30/20 and 305/30/20 would be under the threshold?

[s346k]

285/30/20 & 305/30/20 are the factory ss 1LE sizes. i think most cars will only tolerate <.75" difference. mine went along with a 1" difference for a couple hundred miles then it had enough and started the stabilitrak song.

[ctrlz]

arpad_m gave a killer answer.

I will add that, in certain situations, differences in warming rates between the front and rear tires can also cause the error to pop up, particularly when you are already "on the edge" like arpad said.

[chaospiece]

Originally Posted by 1ssa_camaro

Hey guys I just got some new wheels and tires. They’re 20x10.5 with 305/35/20 Nitto nt555R in the rear and 20x9.5 nitto nt555 g2 275/35/20 in the front.

Before installing them I rerouted the wiring harness how everyone recommends to do. After the first drive the traction control light keeps coming on. Is there a way to remove this. Took it out for a spin about an hour later to see if the issues resolves but still there.

I’ve seen some people run this setup perfectly fine. They just moved the wiring harness and drove fine.

I’ve seen that some people say that it removes in a day or two or others unplug their battery for 5-20 mins. New wheels and tires do have tmps sensors as that light has not come on.

Any recommendations. Moving down tire sizes to a 305/30 is not an option as of now. Thank you.

Yeah you should not have gone 275 35 in front with a 305 35 in rear, I haven't seen anyone get away with that. Even if stabilitrack doesn't come on, the car is still fighting and applying the brakes to keep the rotation the same, people don't realize that and then have warping rotors and alignment issues constantly braking different wheels on roads. And then there's the scrub radius shift which alters the suspension geometry affecting the whole car

You have to either switch the rear to 305 30 or the front to 285 35.

I run 275 35 with 305 30 on one set of tims, and 285 30 with 305 30 on another.
My friend runs 285 35 with 305 35.
You have to be below 3% there is no way around it.

[Msquared]

All of you seem to be implying that a 275/35/20 is taller than 305/35/20. Are you sure you mean that? Because that's not true at all. A 275/35/20 is 27.6" tall, and a 305/35/20 is 28.4" tall. That means the rears are 2.9% taller than the fronts, and the rake is not reversed. That still may be too big a difference in diameter, though. The SS 1LE fitment is 26.7 and 27.2, for a 1.9% difference in height. I am getting away with a 2.7% difference in tire heights for autocross use (although the tires are shorter overall at 275/30/19 and 305/30/19).

As a general commentary, I will never understand why people insist on putting taller tires on performance cars. It's generally not good for handling or acceleration, and it can cause tire rub. Note that for the top-performing Camaro, the ZL1 1E, Chevy uses 19" wheels with significantly shorter tires than the SS 1LE.

[arpad_m]

Originally Posted by Msquared

All of you seem to be implying that a 275/35/20 is taller than 305/35/20. Are you sure you mean that? Because that's not true at all. A 275/35/20 is 27.6" tall, and a 305/35/20 is 28.4" tall. That means the rears are 2.9% taller than the fronts, and the rake is not reversed. That still may be too big a difference in diameter, though. The SS 1LE fitment is 26.7 and 27.2, for a 1.9% difference in height. I am getting away with a 2.7% difference in tire heights for autocross use (although the tires are shorter overall at 275/30/19 and 305/30/19).

As a general commentary, I will never understand why people insist on putting taller tires on performance cars. It's generally not good for handling or acceleration, and it can cause tire rub. Note that for the top-performing Camaro, the ZL1 1E, Chevy uses 19" wheels with significantly shorter tires than the SS 1LE.

I definitely agree with your general comment.

As to the first point, that is not what we, or at least not I, are implying, but rather this. You may have forgotten that we aren't talking about a 1LE here, just a regular SS, so OP's setup does invert the rake.

         SS      OP     Me
front:  27.7"   27.6"  27.6"
 rear:  27.6"   28.4"  27.4"
 
 diff:  +0.1"   -0.8"  +0.2"

(included my setup as illustration, needless to say, I don't have any problems with it)

[grampa_ss]

what Matt said. I've been running rears 305/35/20 (28.4) with stock fronts 245/40/20 (27.7) since 2017. Never had an issue.

[arpad_m]

Originally Posted by grampa_ss

what Matt said. I've been running rears 305/35/20 (28.4) with stock fronts 245/40/20 (27.7) since 2017. Never had an issue.

Because you're right at 2.9%, not having changed the fronts. Go to 275/35/20 and you'll probably see the same problem as OP.

Anyway, this is now , so I'll just shut up, especially since I'm not an expert at all, and some of this is just guesswork on my part.

[Puddin]

Originally Posted by 1ssa_camaro

Hey guys I just got some new wheels and tires. They’re 20x10.5 with 305/35/20 Nitto nt555R in the rear and 20x9.5 nitto nt555 g2 275/35/20 in the front.

Before installing them I rerouted the wiring harness how everyone recommends to do. After the first drive the traction control light keeps coming on. Is there a way to remove this. Took it out for a spin about an hour later to see if the issues resolves but still there.

I’ve seen some people run this setup perfectly fine. They just moved the wiring harness and drove fine.

I’ve seen that some people say that it removes in a day or two or others unplug their battery for 5-20 mins. New wheels and tires do have tmps sensors as that light has not come on.

Any recommendations. Moving down tire sizes to a 305/30 is not an option as of now. Thank you.

I'm one of those who've been running this setup for over a year and a half without problems. The only differences are I run a 10 in the front and a 11 in the rear also mine are Continental Extreme Contacts Sports all the way around. I did have to move my harness but other than that no issues and my rotors are fine because I've checked them when I switched to the Z26 brake pads.

[Puddin]

I believe you're allowed 1" between the front and back before stabilitrack starts going off.

[Msquared]

Originally Posted by arpad_m

You may have forgotten that we aren't talking about a 1LE here, just a regular SS, so OP's setup does invert the rake.
[CODE] SS OP Me
front: 27.7" 27.6" 27.6"
rear: 27.6" 28.4" 27.4"

diff: +0.1" -0.8" +0.2"

Oh, gotcha. Honestly, I never calculated the diameters for the SS tires, so I never realized there was a "reverse rake." However, the 0.1" difference is so minimal as to effectively be zero difference. There would be bigger differences between same-size tires with different amounts of wear (3/32" is about the same 0.1", and almost all street tires have at least 7/32" tread when new).

One other thing I just noticed is that the OP is running two different models of tires front and rear (although both in the Nitto 555 family). Looking up the specs on Nitto's own site, his NT555 G2 front tires are 27.56" tall but the NT555R rear tires are actually 28.58" tall (about 0.2" taller than the nominal spec calls for). Therefore he's actually seeing 3.7% difference in tire height because Nitto made the rears taller than spec. That's probably the issue: it's just too big a difference in tire height.

[grampa_ss]

Try this one on. I also run my 26" rear drag radials. Again, stock front is 245/40/20 rear are 305/35/18 - 26.4 which is over 1 inch shorter. Still don't have issues. Go figure.