Diameter of 2015+ Nismo rear sway bar
 

Does anyone know the diameter or thickness of the 2015 plus plus OEM Nismo rear sway bar? It has a different part number than both the non Nismo and the 2014 and prior.

I purchased a bar that purported to be a Nismo bar buy measure the same thickness as my stock bar and even weighed the same.

27mm

That is for the 2015+ Nismo?

Isn't that what you inquired about?

Yes. I just wanted to be certain that is what it is with personal knowledge from someone. 27mm is the size of the pre-2015 Nismo rear bar which has a different part number leading me to believe that it would be a different size.

The thickness varies slightly along the length of the bar. Even though the Sway Bar Diameters sticky in the Brakes & Suspension subforum indicates that all Nismo rear sways have a thickness of 25.4mm, I get an average measurement of approximately 26.7mm. I can only speak for 2015+ Nismo models.

I went out and checked my 2014 stock nismo rear sway bar out of curiosity since it's up on the lift anyways, not that it's exactly relevant to OP's question.

It definitely depends on where you check, in the absolute center of the sway bar where it makes the big bend around the driveshaft I was getting about 26mm but on the straight sections for example next to the endlink it was 27mm.