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Old 04-10-2001, 08:03 AM   #1
Neil Wallerstein
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Question 225/40-18s on Snow

Are there any 225/40-18 tires that would be safe to run on snow. I am getting 18" wheels when my WRX comes in and I really don't want 2 sets of tires. I only run on the street no racing..
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Old 04-10-2001, 08:07 AM   #2
DLC
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Get the newest C&D and read Patrick Bedard's article on snow tires.

Summary: No.

18s are OK, but you're going to need a full set of winter wheels/tires for it, as your 18s wouldn't do very well with a skinnier tire i'm betting. Wide = bad in snow.
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Old 04-10-2001, 08:09 AM   #3
rkkwan
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The only M+S tires in this range is the Pirelli P7000 SuperSport. I have the 225/50R16 on my Supra. It's okay in the light stuff, and is a quiet and comfortable tire. However, it's better to pull off the road when it's snowing hard. Of course the Supra being RWD doesn't help things either.
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Old 04-10-2001, 08:20 AM   #4
Thug
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I wouldnt go out even in a light dusting of snow with P7000's. Definitely get some smaller wheels/tires for winter.
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Old 04-10-2001, 08:21 AM   #5
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hmm

18"->High performance tire->not designed for snow->low traction->slide into curb distroy 18" rim

sooo no bad idea
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Old 04-10-2001, 08:33 AM   #6
ColinL
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Neil, it's not going to be remotely driveable. If you buy 18" wheels, you should have summer tires on them. You'll need to go back down to at least a 16" to get even performance winter tires, say like a Blizzak LM22.

If you insist on having only one set of tires, better have another car to drive when ice or snow is on the ground and watch those summer tires when the ground is dry but COLD... they turn into rocks at low temps.
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Old 04-10-2001, 11:08 AM   #7
tomas
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The main reason why it won't work very is due to the tire width. Your 225mm tire is 225mm wide and 90mm tall (40% of 225). Let me cover the width first and I'll come back to the height issue.

Well the weight of the car is distributed somewhat equally between all four tires. So lets assume your impreza is 2600lbs (don't flame me for not having the weight just right. it is an example). So, you are carrying about 650lbs/tire ignoring weight of driver and passengers.

Well depending on weather conditions you want your tire to do different things. In mud you want your car to float. Well, ok, at least not sink anyway. So, you do this by putting on a wider tire so that the 650lbs/tire is spread out over a larger contact patch. In snow however, you want to cut through the snow to the pavement. This is achieved by putting on a really narrow tire so you have that same 650lbs coming down on a smaller patch of tire. Does that make sense?

Now for tire height. You are going to want a relatively tall tire for snow. I use a 195/65R15 for my snow tire. That puts my tire height at 126.76mm. This is a good 30% taller than your tire. That extra height will add flex so when I hit potholes, curbs, and other snow related problems I won't ruin my wheels.

My setup is 225/35R18 Yoko Paradas for summer, 195/65R15 Blizzaks for winter, and 205/50R16 for track. This is a pretty good plan if you ask me. Not to mention, if you can afford 18"ers you can probably spend the $600 on winter wheels and tires
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Old 04-10-2001, 01:10 PM   #8
rkkwan
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Neil, the Pirelli P7000 SuperSport is "drivable", at least in 225/50R16, in light snow. However, I'd agree with others that it's really not a good idea. I find that it's just too much a compromise. I'm looking for more grip in the dry, and in the snow I'm hiding in the slow lane.

That's why with the WRX, I'm putting summer Parada on my 18" wheels, and keep the original for the winter. [It doesn't snow enough here in RI to get winter tires.]
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Old 04-10-2001, 08:02 PM   #9
Neil Wallerstein
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Question

How do people with new Corvettes and Camaros do it? There tires are huge...
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Old 04-10-2001, 08:07 PM   #10
RidinLow
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They don't.
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Old 04-10-2001, 08:33 PM   #11
ColinL
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They work fairly well with winter tires too, but Garrick is right-- never seen a Vette out in the nasty winter stuff. Anyone that does overextended themselves getting the Vette.
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