IS - 3rd Gen (2014-present) Discussion about the 2014+ model IS models

I need help with fitment

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Old Feb 1, 2021 | 12:28 AM
  #16  
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Originally Posted by Sasnuke
This is the rim specs for the vehicle in the pic: 18x9.5/10.5 +22 (EDIT: It can be found on ESR's Facebook page, unfortunately the link is not working)
I'm not sure what the tire sizes are, but something struck me as odd about the pic...the front calipers. At first glance it looks like it has the big calipers found on the IS200t/IS300/IS350...but upon a closer look the caliper doesn't look right.
I almost think this is an IS250 with some kind of caliper cover on it for appearance purposes.


It looks like an IS200t/300/350...but is it really.

If this was an IS250 then the rims would have a much easier time of fitting as the 250 front brakes have small floating calipers.

You can tell the rear tire is stretched for sure in the original pic posted above as it looks like the fender is covering/sitting on half the sidewall near the top, towards the back.

ESR does state you can contact them for fitment info...maybe give it a shot and see what they say.
Also the rear wheel looks like it's cambered a little, like it has a camber kit....trying to make the wheel tuck.

How do you know if tires are stretched? good question...for an ideal and safe fitment the rim width should be approx. 90% (+/- 5%) of the tire tread width.
Example: if you want to run a 9.5 inch (241mm) rim (the width), then the tire sizing would have a range of 245mm to 275mm tread width...the ideal fitment would be a 255mm or 265mm tire.
If someone is running a 10.5 inch (267mm) rim with a 235mm tire...without even doing the math you can see already the tire is stretched...simply the tire tread should never be narrower (smaller) than the rim width.
im thinking of going with rsr downs instead of superdowns. would changing to downs instead of superdowns change the options i have with tire size? if so then what tire size would be best for the 19x8.5/9.5?
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Old Feb 1, 2021 | 05:20 AM
  #17  
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Originally Posted by slowISyeg
im thinking of going with rsr downs instead of superdowns. would changing to downs instead of superdowns change the options i have with tire size? if so then what tire size would be best for the 19x8.5/9.5?
Not really...the issue is the rim offset is driving the tire size, not so much the lowering of the car. While lowering the car does have an impact, the rim offset is mostly the issue.
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Old Feb 1, 2021 | 06:56 PM
  #18  
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Originally Posted by Sasnuke
Not really...the issue is the rim offset is driving the tire size, not so much the lowering of the car. While lowering the car does have an impact, the rim offset is mostly the issue.
i have found and talked to 2 other people who were running the same wheels and same size (2is350, 200t) and they seem to fit aslong as you put spacers for the front. so i think i will go through as i really do love the wheels. The new thing to figure out now would be the tire size. ill most likely be on downs.
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Old Feb 1, 2021 | 08:03 PM
  #19  
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Originally Posted by slowISyeg
i have found and talked to 2 other people who were running the same wheels and same size (2is350, 200t) and they seem to fit aslong as you put spacers for the front. so i think i will go through as i really do love the wheels. The new thing to figure out now would be the tire size. ill most likely be on downs.
Find out from the 200t owner what tire size they are running and use those.
Did they mention what size spacer you need for the front?
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Old Feb 1, 2021 | 08:49 PM
  #20  
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Originally Posted by Sasnuke
Find out from the 200t owner what tire size they are running and use those.
Did they mention what size spacer you need for the front?
is200t was running stretched tires but i dont wanna do that. they said i needed a 15mm for front
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Old Feb 2, 2021 | 05:11 AM
  #21  
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Originally Posted by slowISyeg
is200t was running stretched tires but i dont wanna do that. they said i needed a 15mm for front
A 15mm spacer sounds reasonable.
You do realize they were running stretched tires because that's the only way they could get the rims to work...the issue isn't the rim rubbing on the fender, it's the tire rubbing...you can't run those rims without the stretched tires.
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Old Feb 2, 2021 | 02:25 PM
  #22  
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Originally Posted by Sasnuke
A 15mm spacer sounds reasonable.
You do realize they were running stretched tires because that's the only way they could get the rims to work...the issue isn't the rim rubbing on the fender, it's the tire rubbing...you can't run those rims without the stretched tires.
okay i see. whats the least amount of stretch possible?
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Old Feb 3, 2021 | 06:14 AM
  #23  
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Originally Posted by slowISyeg
okay i see. whats the least amount of stretch possible?
Going back to the original rim sizes you were looking at:
19x8.5 +30
19x9.5 +35

On the rear you can use a 255/30/19.
On the front, because you need to keep a relative size to the rear, you'd be looking at a 225/35/19.
However, as you will be adding a 15mm spacer to the front, effectively changing the offset from +30 to +15, then a 225/35/19 is likely going to be too big...unfortunately a 225/35/19 is the smallest 19 inch tire available.
If you drop to 18 inch rims that will open up more tire options.
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Old Feb 3, 2021 | 05:01 PM
  #24  
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Originally Posted by Sasnuke
Going back to the original rim sizes you were looking at:
19x8.5 +30
19x9.5 +35

On the rear you can use a 255/30/19.
On the front, because you need to keep a relative size to the rear, you'd be looking at a 225/35/19.
However, as you will be adding a 15mm spacer to the front, effectively changing the offset from +30 to +15, then a 225/35/19 is likely going to be too big...unfortunately a 225/35/19 is the smallest 19 inch tire available.
If you drop to 18 inch rims that will open up more tire options.
then what if i run stretched tires?
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Old Feb 3, 2021 | 05:17 PM
  #25  
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Originally Posted by slowISyeg
then what if i run stretched tires?
If you're talking about the 19's, a 225/35/19 is the smallest 19 inch tire you can buy...so you can't stretch it on a 19x8.5 because it's actually the correct size for that rim.
There is no smaller tire in existence to fit that rim.

If you're talking about 18 inch, then you need to pic a width before the tire size.
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Old Feb 3, 2021 | 08:53 PM
  #26  
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Originally Posted by Sasnuke
If you're talking about the 19's, a 225/35/19 is the smallest 19 inch tire you can buy...so you can't stretch it on a 19x8.5 because it's actually the correct size for that rim.
There is no smaller tire in existence to fit that rim.

If you're talking about 18 inch, then you need to pic a width before the tire size.
oh... what about if i change wheel to lets say the sr01, cs01? idk if they have the same fitment as the cs11
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Old Feb 4, 2021 | 05:31 AM
  #27  
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Looking at the specs for those other wheels it would appear they follow the same design format...basically they are all the same rim, just different faces for a different look.

Did you ever find out the specs the 200t owner was running? Tires and rims.
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Old Feb 7, 2021 | 11:52 AM
  #28  
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Originally Posted by Sasnuke
Looking at the specs for those other wheels it would appear they follow the same design format...basically they are all the same rim, just different faces for a different look.

Did you ever find out the specs the 200t owner was running? Tires and rims.
the 200t was running 225/35/19 all around with 19x9.5+35 all around
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Old Feb 7, 2021 | 12:13 PM
  #29  
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Originally Posted by slowISyeg
the 200t was running 225/35/19 all around with 19x9.5+35 all around
At least you know how he got it to fit...a 225/30/19 tire ideal fitment is 19x8, and a max fitment of 19x9...so it's an additional 0.5 inch stretch over the max.
With no spacer on the rear he could have run a 255/30/19 in a narrow fitting tire, which there are plenty of options, but if he is using a 15mm spacer on the front there is no way the 255 would work.
Assuming no fender work was done, outside of the coilovers was there any mention of camber arms for the rear? Or upper control arms for the front? This way the camber could be adjusted to tuck the top of the wheels in.
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