19x11" rear rim offset?

[RunninHorse]

Wanting to run a set of MT 305/35-19 ET Streets. An 11" rim would be ideal. Currently on a 9.5", and they're bulging over the beads and wearing unevenly.

Anyone know what offset works for 19X11" rear rims on a S197 (2013)? Trying to tuck the tire in just a hair.

I've been searching and haven't been able to find a good answer. I think it'd be around 54-58mm, but I don't want to guess wrong with a $500+ set of rims.

 

[biminiLX]

Check the specs on 18x10.5” Darkstars and adjust accordingly (either .25” more backspace or .375” if you want a slight tuck).
The Darkstar data is published and they fit perfect for me.
-J

 

[RunninHorse]

Check the specs on 18x10.5” Darkstars and adjust accordingly (either .25” more backspace or .375” if you want a slight tuck).
The Darkstar data is published and they fit perfect for me.
-J

Good idea, thanks. I can do that and also try to adjust for tire size differences. What tire are you running?

 

[RunninHorse]

Looks like to make the most room for a rear tire I can remove the factory tie downs, relocate bumpstops, remove the plastic shrouds from the shocks, and modify the lower shock mounts.

Probably overkill for a 19x11", but it'd be nice to have the extra room for a bigger track tire.

Leaning towards a 59mm offset.

 

[Coz]

Apex EC-7's are ET52
19x11

American Muscle AMR 19x11 are 56
Mustang AMR Black Wheel - 19x11 - Rear Only (10-14 All)

 

[RunninHorse]

Yeah, all of AM’s 19x11s are 56mm offset. I’m worried that won’t tuck it as much as I want. Hard to tell from their pictures.


Sent from my iPhone using svtperformance.com

 

[basspro302]

You are kinda stuck with that offset mine are 20x11 and they would rub the inside fender but the tucked perfect

 

[Coz]

I thought the larger the positve (EDIT - correction from "negative") they would tuck in more. In any case the difference is barely more than an 1/8th of an inch.

 

[basspro302]

Mine where +50

 

[RunninHorse]

You are kinda stuck with that offset mine are 20x11 and they would rub the inside fender but the tucked perfect

@basspro302 Stuck how, as in limited by what's for sale? The brand/style that matches my fronts can be ordered with custom offsets.

I'm planning to bolt the old 305s back on and take some measurements first.

I thought the larger the positve (EDIT - correction from "negative") they would tuck in more. In any case the difference is barely more than an 1/8th of an inch.

Right.

 

[Coz]

My point is that there are plenty of people running the 19x11 Apex wheels with +52 and 305s with no problem. Some even have 315s.

So if they are ok with +52 then +56 will tuck in even more. But then, if you run coilovers in the back, without divorced springs, may have a problem with inboard clearance.

You may even have to modify the rear bump stop mount. That is mainly an issue when you're changing a tire and your axle is hanging.

See this page for fitment issues overall for the S197. Info on bump stops is all the way at the end.

S197 Mustang Wheel & Tire Fitment Guide

 

[RunninHorse]

My point is that there are plenty of people running the 19x11 Apex wheels with +52 and 305s with no problem. Some even have 315s.

So if they are ok with +52 then +56 will tuck in even more. But then, if you run coilovers in the back, without divorced springs, may have a problem with inboard clearance.

You may even have to modify the rear bump stop mount. That is mainly an issue when you're changing a tire and your axle is hanging.

See this page for fitment issues overall for the S197. Info on bump stops is all the way at the end.

S197 Mustang Wheel & Tire Fitment Guide

That link has a lot of helpful information, thanks. I've looked at a ton of 19x11s and most are 52/56mm offset like you said.

I only found one example of 59mm offset and that's a 20x11.

56mm looks like a safe bet. Plus I can still move the shock, remove the factory tie down, etc.. if I need a little more clearance.