ESP Blinking after changing the tires

[Testing1209]

Hi,
Ive just changed my Model S tires from 19 to 21 inch. And Ive out lowering links and put a 295/35/21 in the rear and 245/35/21 in the front. And now when I drive over 40-50kmh the ESP starts Blinking. Ive changed the wheel config to twin turbine staggered and arachnid staggered with no success. Those who run wider aftermarket tires, have you experienced the same issues and what did you do to solve it?

 

[Usher]

I'm sure you've exceeded the difference in tire diameter it's expecting with your rear tires so much larger diameter than the fronts. I run stock sizes so I haven't run into this, but the solution is probably either taller front tires or shorter rear tires.

 

[Testing1209]

I'm sure you've exceeded the difference in tire diameter it's expecting with your rear tires so much larger diameter than the fronts.

Thats why I put arachnid wheel config because it has similar rear tires: 295. But the arachnid front tires are 265 and mine 245. How does those with aftermarket tires fix this?

 

[Usher]

Thats why I put arachnid wheel config because it has similar rear tires: 295. But the arachnid front tires are 265 and mine 245. How does those with aftermarket tires fix this?

295 is the width in mm. The diameter is calculated from all the numbers. 295mm * 0.35 (aspect ratio) * 2 / 25.4 + 21" = 29.13" in the rear. Your fronts are about 27.75"
The stock sizes are around 28" front and rear.

 

[Testing1209]

295 is the width. The diameter is calculated from all the numbers. 295mm * 0.35 * 2 / 25.4 + 21 = 29.13" in the rear. Your fronts are about 27.75"
The stock sizes are around 28" front and rear.

What should I do?

 

[Usher]

If it was me, I'd get a new pair of rear tires that are a 295/30-21. If the ones on the car are outside the return period, I'd either sell them or keep them and then next time I'm due for tires, buy a pair of taller tires for the front to match them (assuming there aren't clearance / rubbing issues).

 

[GHammer]

What should I do?

Replace the rear tires with 295/30 which is stock. The 35 aspect ratio makes your sidewall too tall which increases the total diameter beyond what the car will tolerate.

 

[Testing1209]

If it was me, I'd get a new pair of rear tires that are a 295/30-21. If the ones on the car are outside the return period, I'd either sell them or keep them and then next time I'm due for tires, buy a pair of taller tires for the front to match them (assuming there aren't clearance / rubbing issues).

I found the problem and fixed it, the difference between the rear tire pressure was 0.6 bar. Filled the rear to 2.8 and front 3.3 and no problems.