Widest 19" you can put on a coupe X squared?
 

Have a Journey 11' with 18X8" wheels and 15mm spacers due to Akebono brakes. Going to 19" and NO spacers. What's the widest combo of wheel and tire squared one can use? Hoping to go 19X9.5" and 255 or 265 width.

Thanks!!:)

9.5 will fit just depends on offset
+35 to be safe or +22 if you want some camber too but may need to run 255s

I have 18x9.5 275 all around, so I would assume the 19's would be similar. Dropped on Eibach springs.

What offset are you running Mike, wasn't it like a +30??

First thanks for moving this post! Thought I could do 19x9.5 based on other posts I've read. Hoping to get the Enkei TY-5 19x9.5 comes in 15 or 35 offset. Think 35 would be safest to clear the Akebono's? Didn't think 275 would be possible but if Lt8Che is running 275 no issue then should be fine.

Does anyone know if I'll need a camber kit? My adjustment is maxed out according to Firestone.

I'm currently running 18x9.5 +30 with 265s all around as well. No additional camber equipment either, but I'm really not that low. It's not an X, but I don't think the track widths up front are different.

I've got a 2012 G37xS which had 225/50/R18. I just upgraded to 19x8.5 with Mich Pilot Sport A/S 3+ (255/40). I've not had any issues with rubbing. But I have noticed the sidewall doing something funky. I can be driving in a straight line or turning. I notice the car bite quicker but also it seems to float on me. I'm not sure what is causing this. Anyone have any suggestions? Tire place swears this was the right setup and I talked to the dealership and they confirmed that the car came stock with 17/18/19 as options. I was pretty sure this was the case. I believe the tire is too fat for the wheel but I've not read of others having this issue.
Thanks.

255 is a standard mount on a 8.5", might up your tire pressure a bit and see if that helps.

I'll give that a try. They had 37 psi at the beginning and the front wheels out of balance the first 2 days. They fixed the alignment by adding weights to the front tires and taking air out of the tires. The new psi is around 34 which seems more correct. Mich recommends 35 psi.

There's also a couple other things to consider. Since these tires are new to you (I assume you weren't running the Michelin A/S 3 previously) they will have different handling characteristics. Also if your new wheels are further in or further out from your previous wheels this will change your scrub radius which can lead to more or less steering feedback and response.
The combination of new wheel & tire sizing combined w/ a new tire to you, will result in some adjustment on your part to get used to all that.

I was on Nexen cp672, 225/50/r18 previously. Agreed, they are different and I will just have to get used to them at this point. Thanks for all the info.