225/50/R17 or 235/45/R18 for Honda Accord 2009 EX-L ? - Drive Accord Honda Forums
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post #1 of 12 Old 04-13-2019, 04:19 PM Thread Starter
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225/50/R17 or 235/45/R18 for Honda Accord 2009 EX-L ?

Hey guys ,

So i have and 2009 Accord Ex-L Coupe and I was looking at buying new 18 inch tires. I was hesitating between the 225/50/R17 and the 235/45/R18 .

Could you guys help to understand what's the difference and is it major ? My old tires weren't so comfortable so i would like these to be with some good performance also.

Thanks !

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post #2 of 12 Old 04-13-2019, 10:29 PM
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First, to buy 18in tires, you'll need 18inch wheels.

Generally, the smaller the wheel size, the more comfortable it'll be. Read the TireRack reviews (or tests) for performance and comfort ratings.


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post #3 of 12 Old 04-14-2019, 07:55 AM Thread Starter
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post #4 of 12 Old 04-19-2019, 09:54 AM
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I had the stock OEM 17s wheels w std. 225 size tires on my Coupe.
(I hated those wheels - in my avatar to left).
I sold them off and put on Infiniti G35 18" stock 7 spoke wheels (the hard to find 'track edition' wheels).

I certainly noticed a ride difference. But it's not major. It's still pretty reasonable to me, and for the upgraded look - I'm all for it.

These particular wheels push the wheels offset out 1" away from center of the car compared to stock.
That, combined with the smaller 215 Pirelli P Zero Nero tires that came with the rims mounted make my steering the most noticeable difference. It's more 'darty' so to speak. But with proper sized tires that could go away.

2011 Accord Coupe LX-S AT i4 cyl.
'04 Acura TSX 2.4L 6MT
'95 Acura Integra RS 5MT (bought new, had it 19.5 years!)
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post #5 of 12 Old 04-20-2019, 11:46 AM
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just going from stock 18" (+55 offset) and stock 235/45/18, to (+45 offset) 245/45/18 the steering was NOTICEABLY stiffer. Better steering feel IMHO when the wheels go further out. I'm sure at some point it'l be detrimental but that 10mm difference offset really made the car feel better in every way.

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post #6 of 12 Old 04-20-2019, 01:17 PM
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Hmmm. I went from stock 17" offset 55mm rims to the 18" offset 30mm rims. A pretty big jump.
I feel like it's more 'darty' and 'go kart' like steering feeling. Quicker, but more twitchy feeling in a way.
If you like to zone out and loaf on the hwy one handed kind of driving this would not be as easy / pleasant in a anaesthetic / sedated kind of way. It's much more 'active' 'handful' so to speak. Feels too quick to me IMHO.

But as mentioned the 18s came with skinnier 215 tires and they are 'stretched' a bit to fit the 8" wheels.

2011 Accord Coupe LX-S AT i4 cyl.
'04 Acura TSX 2.4L 6MT
'95 Acura Integra RS 5MT (bought new, had it 19.5 years!)
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post #7 of 12 Old 04-20-2019, 03:57 PM
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If you want a decent ride you need to go to 16 not 18. I'm thinking about taking my '18 hybrid from 225/50/17 to 215/60/16. The /60 will be more forgiving and give a better ride. The 215 will give slightly better mpg due to less air and rolling resistance. The 15# or so weight reduction per corner will definitely handle better and give another bit of mpg gain.

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post #8 of 12 Old 04-21-2019, 04:41 AM
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@GreenMM, it’s interesting you mentioned the word darty. When I put 15mms spacer on the rear end of my car, the car immediately got squirrelly in corners – not good. Perhaps 15mm spacers were too much. But that slight change in suspension geometry had a very pronounced adverse effect on stability. I’m not sure why, but it seems our cars seem very sensitive to changes in offset.

@LDB415, I had OEM 215/60-16s on my car for the last 50,000 miles. I did it solely for ride quality. Ride quality improved dramatically. Handling decreased very slightly. The stealth factor increased exponentially. With such boring wheels on my V6-6MT Accord, it became almost invisible. With regard to increasing fuel economy, I’d say it added no more than 1.0 to 1.5 mpg. Part of that was less rolling resistance (215s verses 235s). Part was a more eco-designed tire tread and rubber compound (grand touring all season tires versus a high performance all season tires), and a small part was from shedding 10 pounds of spinning weight per corner.

On that subject, the 40 lbs total reduction of spinning weight could have no greater effect than reducing 70 pounds of “static weight from the frame.” At most, spinning wheel/tire weight has an effective ratio of 1.8X that of static “frame” weight. Losing 40 pounds of wheel weight is like having burned 70 pounds of gasoline, or about 2/3s of a tank. That’s certainly good for fuel economy, acceleration and braking, but not by very much.

I know you did not say this, but if you are buying new wheels solely for saving money at the pump, you’ll need to drive a long time to break even. If gas costs $3.50 per gallon and you improved your fuel economy by a whopping 3 mpg, from 40 mpg to 43 mpg, the new wheels cost $700, and X is miles driven:

• (X/40 mpg)($3.50) = (X/43 mpg)($3.50) + $700
• .0875X = .081395X + $700
• .00610X = $700
• X = $114,667 miles

If you could average 3 mpg more, you'd need to drive about 115,000 miles to break even. But perhaps more important to you, will 16’s fit over your brakes? I don’t think they will. I think the smallest you can go are 17s.

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post #9 of 12 Old 04-21-2019, 06:53 AM
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Excellent response. Yes, it would take a very long time to break even just on fuel savings. I probably won't drive that many miles in the remainder of my lifetime. There would be some additional savings from less strain to get them rolling or to stop them, but not a lot. If I did it, it wouldn't be thinking I'd make money overall but to have wheels I like better aesthetically and a smoother, quieter ride. The mpg savings would just be a bit of a bonus.
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post #10 of 12 Old 04-21-2019, 03:47 PM
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Yes, darty / squirrely feel a bit. Certainly instantly noticeable - even to the people who have cars to drive Point A to B only (non enthusiasts).
I am curious what the feel would be with 235 tires on these 18" rims.
I didn't even think of the weight savings. I did notice that the stock Honda 17" alloys w 225 tires were PORKERS. W A Y heavier in hand than the 18" Infiniti (with skinnier tires 215) and also a lot heavier than my snows which are OEM Mazda6 17s with 215 tires as well.

2011 Accord Coupe LX-S AT i4 cyl.
'04 Acura TSX 2.4L 6MT
'95 Acura Integra RS 5MT (bought new, had it 19.5 years!)
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post #11 of 12 Old Yesterday, 06:20 PM
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I made the jump from the 16" steelies that came with my LX to 18" rims and 235/45-18 tires. At least with the right rims and tires, you won't notice much (if any) degradation in ride quality. I got the Motegi MR131 Traklite rims, which with tires weigh maybe 1-2 lbs over the 16" set. Obviously, the heavier the rim, the worse the ride (and handling).

The steering definitely got heavier and more direct feeling though. It's much more reassuring. It's kind of shocking how much lighter the 16" set is when I put them on for the winter.

I have no experience with 17" rims on the Accord, but there's no reason not to go to the 18" rims besides cost.

16" rims are sketchy with the EX 11.8" brake rotors. They (barely) fit inside my 16" winter set, but it's very wheel dependent. Tire Rack is generally spot on with what rims will fit and what doesn't.
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post #12 of 12 Old Today, 04:22 AM
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I'd imagine adding the rear spacers (which I have 15mm myself) makes the car want to understeer more. Increasing the back wheel span by 1.5" will change the handling of the car because now the front to rear relationship has been changed. Our cars being FWD probably makes this more noticeable because the front is relying on the tracking of the rear to influence how the car turns and handles. The wider the rear span is, the less the car is going to want to turn.

That's my logic at least lol

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Performance : Tuned Ktuner, Fastline ss clutch line & powerlinks, Hardrace UCA/LCA/end links, P2R gaskets, Clutchmasters flywheel, XLR8 ss brake lines, Progress 22mm rsb, HSD coilovers, Blox 15mm rear spacers,
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