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355/30/19 fit on the rear with signature 19x12 wheels

99bluebird

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Joined
Dec 22, 2023
Messages
15
Location
NC Triangle
V-Series Cadillac(s)?
ct5v blackwing 22
Just in case anyone else is trying to fit bigger/wider tires in the back, this is about as big as you can go. I have signature 19x12 on the rear and was running 325 tires, but had more space. So now jumped up to 355 rears and they are as big as you can fit on this platform (27"x14").
On the front I have 19x10.5, but could easily fit 19x11 or less backspace, there is more room on the outside before we are flush.
Also of now (200+ miles driving) no issues with the speed sensors with the circumference differnce f/r using a 285/35/19 front.
 
ct5v bw side 2026.jpg
 
Ok, we are going to need a LOT more pictures of this fitment! Thank you for doing this. The 19x11 front is what intrigues me because I have long wondered about a 305/30/19 up front.
 
This is awesome. Is this car lowered?
 
That's a good it more width but that's a LOT taller tire in the rear too. 1.2" of diameter more than stock. 355/25/19 would have been a much closer match to stock with just the added width.
 
Sorry just checking back in on this forum. Not lowered, factory suspension. I am running the slightly longer toe links on the rear with -2.5ish camber. Not sure of the exact specs for offset, I think the signature wheels guy on the forum would have them. From what I remember we added 1" inside and 0.5" outside on the rear wheel. After running them 2000 miles I see a small spot on the front of the wheel well liners where they slightly rubbed. Looked behind and its just sheetmetal there, so no issue (no wires or lines). Must have only been under certain loads or bumps or with weight in the back. 345 would probably be a perfect width if you cared to avoid that. And yes a shorter sidewall would have been fine to, but I think the extra diameter on the back looks good and certainly helps it hook up nicely in first gear!
 

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