BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      10-19-2010, 08:37 AM   #1
sacha101
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205 or 225 for winter tires ???

Hi,
I live in Montreal and we can get alot of snow down here !
Should i go with 17 inch wheels and 205 tires OR 18 ich wheels with 225 tires ...???
I'm really confused... It's my first winter with my new baby !

Tks !
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      10-19-2010, 06:45 PM   #2
bimmer74
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For best results in deep snow, the narrower the better, especially when combined with more aggressive winter tires (such as Bridgestone Blizzak WS-60, WS-70 or Michelin X-ice). Narrower tires cut through snow easier. 205/50R17 is a popular size used in harsh winter climates on the 1-series. On the flipside, the narrower tires will give you less traction in the dry due to the smaller footprint.
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      10-19-2010, 06:53 PM   #3
greg k.
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205 for optimal winter performance.
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      10-19-2010, 06:56 PM   #4
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I went for 225's on 17" rims. The look is really good and I am very happy with the handling. I have had my car in some serious snow with no problems. I think the 205 would look a little small in the back.
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      10-19-2010, 07:40 PM   #5
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You can go with a 205/50/17 or a 225/40/18 if you would like. Both would work without a problem.

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      10-19-2010, 08:59 PM   #6
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The 205 is the optimal choice for winter, and also less expensive.
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      10-19-2010, 10:40 PM   #7
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205/50/17 the thinner the tire width with the largest sidewall is ideal. There's more pressure per square inch of tire the thinner the width and thus more traction. I got them with Blizzak LM-25 run flats.
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      10-20-2010, 06:22 AM   #8
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Quote:
Originally Posted by Mikeshot1 View Post
205/50/17 the thinner the tire width with the largest sidewall is ideal. There's more pressure per square inch of tire the thinner the width and thus more traction. I got them with Blizzak LM-25 run flats.
Bzzzt...WRONG.

There's absolutely no more pressure per square inch on the ground, as the weight of the car hasn't changed. The area of the contact patch is calculated by the weight of the car (at each corner) divided by the psi of the tire.

What does change in the shape of the contact patch...which, dependant upon the surface, is important. The narrower tire provides a long rectangle vs. a wider tire which is more square. A rectangle is better in slippery / snow-covered surfaces than a square as it allows for more "bite" in the direction of travel vs. more float for a wider tire.
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      10-20-2010, 06:28 AM   #9
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For snows you want to get 205's and nothing wider. Use 7j x 17 wheels.
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