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Non-Low Profile Tires on 3IS

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Old 08-20-18, 09:16 PM
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ounagi
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Default Non-Low Profile Tires on 3IS

Greetings,

Has anyone equipped non-low profile tires on their 3IS?

I just had my fourth flat tire this year, with one cracked wheel commuting/traveling to work in the Bay Area. I have a 2014 Lexus 3IS AWD F-sport with stock wheels.

Thanks in advance.
Old 08-21-18, 08:54 AM
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Gsr3is
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Originally Posted by ounagi
Greetings,

Has anyone equipped non-low profile tires on their 3IS?

I just had my fourth flat tire this year, with one cracked wheel commuting/traveling to work in the Bay Area. I have a 2014 Lexus 3IS AWD F-sport with stock wheels.

Thanks in advance.
If you put any tires with larger depth, it will change the diameter of the tire and hence the speedo will be inaccurate. Have you thought about installing run-flats instead? Atleast that will keep your wheels "relatively" safer for normal puncture scenarios.
Old 08-21-18, 12:35 PM
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MorrisGray
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You could buy a wheel and tire package to equal the overall diameter, like a 17-inch wheel and tires to equal 18-inch low profile overall diameter.
Old 08-21-18, 08:07 PM
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ounagi
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Originally Posted by Gsr3is
If you put any tires with larger depth, it will change the diameter of the tire and hence the speedo will be inaccurate. Have you thought about installing run-flats instead? Atleast that will keep your wheels "relatively" safer for normal puncture scenarios.
Thank you for the information and suggestion.

I'd prefer to stay away from run-flats. My former car had run-flats, and it was not ideal given my occasional longer drives. Although, per yours, it would be safer depending on the type of puncture.
Old 08-21-18, 08:10 PM
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ounagi
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Originally Posted by MorrisGray
You could buy a wheel and tire package to equal the overall diameter, like a 17-inch wheel and tires to equal 18-inch low profile overall diameter.
Thank you. I like the stock F-sport wheels, but may consider this to resolve my tire issues.

Last edited by ounagi; 08-21-18 at 08:34 PM. Reason: typographical error
Old 08-23-18, 08:06 AM
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MorrisGray
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If you keep your stock wheels it is not possible unless you have someone recalibrate your speedometer or you just learn to compensate for the difference in speed. But if you don't have the speedometer recalibrated then the mileage odometer will not be true either.
Old 08-23-18, 01:27 PM
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E46CT
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Try going up one size in tire, in terms of sidewall. I'd try that before downsizing your wheels, which is very costly.
Old 08-24-18, 10:28 AM
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Originally Posted by E46CT
Try going up one size in tire, in terms of sidewall. I'd try that before downsizing your wheels, which is very costly.
Yeah I think there's just some risk involved. If OP is okay with the potential of things getting affected by this, then sure. I mean we are talking about the following areas being adversely affected by this change:
* suspension travel
* acceleration
* braking
* gas mileage
* electronic aids

It's really more of a safety and long-term wear issue.
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Old 08-26-18, 05:50 PM
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Jlerwin911
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I am currently looking at moving to 245/45/18 and 275/40/18 on stock F Sport 18x8s and 18x8.5s. It will gain a little over an inch in diameter overall and an inch in the sidewall over the stock tire sizes. Should only throw speedometer of by 1 to 1 1/2 mph. Just not sure if they will run or not.
Old 08-27-18, 12:51 AM
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Originally Posted by ounagi
Greetings,

Has anyone equipped non-low profile tires on their 3IS?

I just had my fourth flat tire this year, with one cracked wheel commuting/traveling to work in the Bay Area. I have a 2014 Lexus 3IS AWD F-sport with stock wheels.

Thanks in advance.

You may go 17 inch wheels for taller sidewalls. That is the best option.

The alternative is to go 225/45/18 and 245/40/18 on stock wheels.
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Old 08-27-18, 03:33 AM
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ShrinkDoc
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Originally Posted by ounagi
Greetings,

Has anyone equipped non-low profile tires on their 3IS?

I just had my fourth flat tire this year, with one cracked wheel commuting/traveling to work in the Bay Area. I have a 2014 Lexus 3IS AWD F-sport with stock wheels.

Thanks in advance.
Originally Posted by Gsr3is
If you put any tires with larger depth, it will change the diameter of the tire and hence the speedo will be inaccurate. Have you thought about installing run-flats instead? Atleast that will keep your wheels "relatively" safer for normal puncture scenarios.
I run 255/45/18's in the rear, and 225/50/18's on the front (AWD). Tires are much taller (by-1.5-2"), but have same width for the most part. No rubbing, even with 4 adults. Car runs much smoother and quieter. Tires that are too wide can begin to look like one of the trucks with oversized tires we see on the road.

The tires fill almost the entire wheel well, and make the most sense for living in the snow and on city streets with huge potholes. Also, your speedo will be off by +3mph @ 60mph, but this is an easy head calculation when driving.

By the way, despite the huge potholes, road debris and other issues, I've yet to have any issue (>15 years) with this setup on my G35 and the IS350 AWD.


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Old 08-31-18, 10:38 PM
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ounagi
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Originally Posted by ShrinkDoc
I run 255/45/18's in the rear, and 225/50/18's on the front (AWD). Tires are much taller (by-1.5-2"), but have same width for the most part. No rubbing, even with 4 adults. Car runs much smoother and quieter. Tires that are too wide can begin to look like one of the trucks with oversized tires we see on the road.

The tires fill almost the entire wheel well, and make the most sense for living in the snow and on city streets with huge potholes. Also, your speedo will be off by +3mph @ 60mph, but this is an easy head calculation when driving.

By the way, despite the huge potholes, road debris and other issues, I've yet to have any issue (>15 years) with this setup on my G35 and the IS350 AWD.
This looks great. I'm leaning toward doing this, but am also considering jennypenny's suggestion above re: 225/45/18 in the front and 245/40/18 in the rear.
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Old 09-01-18, 07:39 AM
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Shouldn't the speedometer error be minus some percent? Larger tire rolls fewer times per mile would register lower speed and odometer reading, right?
Old 09-02-18, 03:27 AM
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MorrisGray
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Yes, the speed indicated will be slower than actual travel speed. You need to know the difference in circumference of the tire to adjust your speed accordingly so you don't get a ticket.
Figure the percentage of difference and add that to indicated speed for your actual travel speed.
Old 09-02-18, 10:22 PM
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Originally Posted by ShrinkDoc
I run 255/45/18's in the rear, and 225/50/18's on the front (AWD). Tires are much taller (by-1.5-2"), but have same width for the most part. No rubbing, even with 4 adults. Car runs much smoother and quieter. Tires that are too wide can begin to look like one of the trucks with oversized tires we see on the road.

The tires fill almost the entire wheel well, and make the most sense for living in the snow and on city streets with huge potholes. Also, your speedo will be off by +3mph @ 60mph, but this is an easy head calculation when driving.

By the way, despite the huge potholes, road debris and other issues, I've yet to have any issue (>15 years) with this setup on my G35 and the IS350 AWD.



Any rubbing on full lock for the front tyres? Wheel well looks fully filled


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