Can I put 18x9.5 +30 wheels on an all stock 2021 civic sport sedan without complications?

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OP, how about 18x8.5 +30 instead?

I just think there's too many potential issues going 235/40 on 9.5 +30.

Here's the look:

1607932-4-2019-civic-honda-si-skunk2-lowering-springs-esr-cs1-bronze-01.jpeg
Thank you, that looks nice. What issues could I run into with 18x9.5 +30? The smallest wheel they have for what I’m trying to get is 18x9.5 +15





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Thank you, that looks nice. What issues could I run into with 18x9.5 +30? The smallest wheel they have for what I’m trying to get is 18x9.5 +15
A multitude (18x9.5 +30). You couldn't lower it without the likelihood of it rubbing the fenders. Your 235/40 tires would be mildly stretched. Your suspension geometry/scrub radius would be off quite a bit. Unless you buy expensive flow formed wheels, they'd be heavy.

Now if you're not worried about any of the above, and are going strictly for looks, go for it. Personally, I think it's not a smart move.

And finally, and this is just my take... I think 18x9.5 +30 on stock suspension would look like utter crap. Your wheels would stick out more than an inch and a half beyond stock. Lowered that might look cool. But at stock height, not so much. Then again, I guess you could roll your fenders.

And you mention 18x9.5 +15? Yikes!!!!!!!!! Are you sure you know how offset works?
 
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Damn, well that sucks. Unfortunately that specific wheel doesn’t go lower than 9.5, but I appreciate the heads up on the potential issues. So 8.5’s would be the sweet spot without worrying about running into any of those issues? I may just keep the wheels stock now cause I was pretty set on those but I might look around some more.
 

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What wheel?
 
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What wheel?
I don’t know how offset works 😂 I’m learning though. This is all pretty foreign to me as I’ve never done anything like this before. The wheel would be what you recommended, unless you have another recommendation that’d be better considering everything would be stock. I’m seeing some 18x8.5 +35 wheels that look decent, but should I just stick to 18x8.5 +30’s?
 
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So here's a quick guide to picking wheel/tires since many people ask "will this specific brand/tire combo fit" but it's a lot simpler than that.

============================================

Offset is measured in mm

Stock sport wheel = 18x8 +50.
If you got a wheel that is 18x8 +30, the wheel would be shifted 20mm further out compared to stock.
Stock sport wheel + 20mm spacer would achieve the same effect of 18x8 +30.

20mm spacers on sport wheels is flush with fenders and can be lowered.

Now you have a reference point: you have roughly 20mm clearance on stock wheel/tire.


Go through the list of wheels you like and the specs they come in.

Input each here in the second column (first column is stock)
https://www.wheel-size.com/calc/?wh...-18X9.5ET45&fcl=50mm&scl=19mm&wcl=30mm&sr=0mm

For now, you can put the stock 235/40/18 tires on the second column as well.

At this point you've input your desired wheel spec with stock tires.
Look at the fender clearance on the second column.

General guidelines:

If wheel poke from stock = 20mm, you can choose to run wider tires that net ~20mm poke as well.
If wheel poke from stock < 20mm, you can choose to run even wider tires.
If wheel poke from stock > 20mm, you might consider stretched tires (aka stock spec or narrower).

You can choose to stretch tires even if you have the clearance.
You can choose to run wider tires if you're gonna increase camber.
Whether your choice is based on "function or form" it's your decision, but keep in mind this guideline is meant to avoid excessive stretching or camber while avoiding rubbing which is the criteria I personally used to decide my setup.

And of course the new tire spec should be roughly same overall diameter as the stock setup unless you want to purposely alter the final drive ratio through the rolling diameter.

The only precaution I would take is when picking high offset wheels, try to get a test fit first. The spokes on my 18x9.5 +45 wheels are very close to the brake caliper and it's not something I even thought to consider until I put them on my car.

I don't think most people will have issues rubbing the suspension, but maybe on 10" width wheels?

Hope this helps
 
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gtman

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The wheel would be what you recommended, unless you have another recommendation that’d be better considering everything would be stock. I’m seeing some 18x8.5 +35 wheels that look decent, but should I just stick to 18x8.5 +30’s?
Oh man. Let me try this again. You said the wheel you were looking at only came in two offsets (+30, +15).

I asked "what wheel"? Meaning what brand and model sere you looking at.

And yes 18x8.5 +35 is a perfectly fine fitment.
 
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JVel

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And yes 18x8.5 +35 is a perfectly fine fitment.
Would this work on a EXT sedan? I was thinking of putting some RPF1s with either D2/Eibach springs. Still doing all my research. New to all this.
 

gtman

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Yes.

Here's 18x8.5 +35 lowered.

654932-16-2017-civic-honda-lx-hr-lowering-springs-avid1-av32-matte-black-01.jpeg


654932-11-2017-civic-honda-lx-hr-lowering-springs-avid1-av32-matte-black-01.jpeg
 
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OP, offset is the distance between the middle of the wheel and the hub mounting surface.

The more negative the offset, the more the wheel will "poke" out towards the fender.

If your OEM wheel is 18x8 +50, that means 18" diameter, 8" width and +50mm offset.

The wheels you are looking at are 18x9.5 +30. So in relation to your current wheels, the edge of the new wheel will poke out ((9.5"-8")/2) +(50mm-30mm) = 39.05mm.

If you're going 9.5" wide, you're better off looking for an offset between +38 to +45.
 

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