Which tire is close to a 35?

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by AntAZBlaz, Apr 2, 2002.

1. AntAZBlaz1/2 ton status

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I was wondering which tire is close to a 35 when they use 285/75r16 type of codes? I would like to pick out a 35/12.5/17 or 16. but they are all measured with the other sysem.

2. chaka4541/2 ton status

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I believe it's the 315/85/16 the ones I got are 35s and they are 315s but if I'm wrong somebody please feel free to step in.

3. Triaged1/2 ton status

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4. AntAZBlaz1/2 ton status

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I was looking to buy some MTR's some day and the larger rims are all measured in the other system.

5. jeffer1/2 ton status

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Here's how to figure that. With the 285/75r16 system.
285=Section Width (mm),
75 = Aspect Ratio (%),
16 = Rim Diameter (inch).
How to figure real tire height: H=2*(Section Width)*(Aspect Ratio)/100/25.4(mm/inch) + Rim Diameter

So, if you want 12.5 inch wide = 12.5inch*25.4mm/inch = 317.5mm --&gt; go with a 315 tire.

For 17inch rims, a 315/75R17 tire will be 35.6/12.4/17 or a 315/70R17 tire will be 34.4/12.4/17
For 16inch rims, a 315/75R16 tire will be 34.6/12.4/16 or a 315/80R16 tire will be 35.8/12.4/16

The 315/85R16's would actually be 37.1/12.4/16. But, there are only so many combos available so take what you can get.

I've seen websites before with all possible combinations and their 'real' dimensions, just can't remember where. Hope that helps.

Jeff.