225/45/18 on 18x8.5 Wheels - *Who is doing this winter setup?
#19
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Narrower tires cut through the ice and snow better than a wider tire. With wider tread, you're more likely to start snow plowing or floating on top of the surface instead of pushing down and through. This floating will result in loss of traction sooner than with a thinner or narrower option. A tire's contact patch or "footprint" greatly influences its performance and is dependent on its profile. The narrower the width, the smaller the contact patch will be. This is the area that makes contact with the ground as rotation occurs. With the vehicle still weighing the same, a smaller contact patch results in more pounds per square inch. This will produce more force on the tire to help it cut into ice and snow and deliver optimum traction.
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JapaneseMuscle (Dec 28, 2021)
#20
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Dude, you are still not getting the question. I already suggested 225/45/18 as a good option. That wasn't the issue. The problem was that you suggested a smaller DIAMETER than OE and that makes no sense at all.
edit: the only way for this to make any sense is that you are arguing that a smaller diameter tire has a smaller contact patch than the same-width but larger-diameter tire. While that is a tiny bit true for tires with stiff sidewalls, it isn't true for snow tires. And given all the other disadvantages of short snow tires (e.g., too much torque, less chassis-height), that wouldn't tip the scales anyway.
edit: the only way for this to make any sense is that you are arguing that a smaller diameter tire has a smaller contact patch than the same-width but larger-diameter tire. While that is a tiny bit true for tires with stiff sidewalls, it isn't true for snow tires. And given all the other disadvantages of short snow tires (e.g., too much torque, less chassis-height), that wouldn't tip the scales anyway.
Last edited by Iowa999; Nov 26, 2012 at 10:43 AM.
#21
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OE tire size 245/40-18 25.7"
My suggestion 235/40-18 25.4"
Your suggestion 225/45-18 25.9"
Either one seems fit to do the job. We recommend the 235's for a few reasons The slightly wider footprint offers more stability for handling as most EVO guys are more aggressive drivers. They won't be as pulled on an 8.5" wheel and carry a little more load. Finally, snow tires tend to have a lot more aggressive shoulder and tread slab. The two tenths of an inch increase with a 225 may seem small, but could cause rubbing issues under suspension load or when turning. Would rather keep the diameter on the conservative side vs making it sit closer to something it could hit.
Does that help?
My suggestion 235/40-18 25.4"
Your suggestion 225/45-18 25.9"
Either one seems fit to do the job. We recommend the 235's for a few reasons The slightly wider footprint offers more stability for handling as most EVO guys are more aggressive drivers. They won't be as pulled on an 8.5" wheel and carry a little more load. Finally, snow tires tend to have a lot more aggressive shoulder and tread slab. The two tenths of an inch increase with a 225 may seem small, but could cause rubbing issues under suspension load or when turning. Would rather keep the diameter on the conservative side vs making it sit closer to something it could hit.
Does that help?
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JapaneseMuscle (Dec 28, 2021)
#22
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It helps, but I flatly disagree. And a 225/45 on an OE wheel isn't going to rub anything unless you stick in a thick spacer, which I already warned against above, so that new issue is a non-issue.
I suppose I could see suggesting 235/40s for people who will see one heavy snow-storm per year and will spend the rest of the winter running their snowtires on bare pavement.... No, that's a lie: to those people I say "get OE-size snows."
And maybe the torque issue isn't so important on an Evo X with seven layers of nannies between you and the ground, but those are the first things I turn off when there's snow.
Yeah, let's just leave it as a friendly disagreement.
I suppose I could see suggesting 235/40s for people who will see one heavy snow-storm per year and will spend the rest of the winter running their snowtires on bare pavement.... No, that's a lie: to those people I say "get OE-size snows."
And maybe the torque issue isn't so important on an Evo X with seven layers of nannies between you and the ground, but those are the first things I turn off when there's snow.
Yeah, let's just leave it as a friendly disagreement.
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JapaneseMuscle (Dec 28, 2021)
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