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Home » Comparisons & Reviews » 285/75R17 vs 285/70R17

285/75R17 vs 285/70R17

December 22, 2022 by Emrecan Gurkan Leave a Comment

Do you feel confused when you read tire sizes?

You will not after today!

I have trained lots of newbies in my previous employment experience. Let me help you!

When I have started to work on the tire manufacturer, I was completely crushed under the tons of tire sizes. I was afraid and don’t know what to do.

At that time, I have decided to use my favorite method.

Divide and conquer!

Alright, first of I would like to define our elements.  Let’s divide it to three.

  • 285
  • 75
  • R17

285: This elements defines the width of the tire. Unit : Milimeter

75: This element defines sidewall height. But, it is on ratio form. If you want to real height of sidewall, you have to multipley this ratio with tire width (285×0.75=213.75). Unit : Milimeter

R17: R means ‘Radial Construction’. So, the number come after the R is the rim size. Unit : Inch

Now, it is time to make some calculation. Continue below the see our, height calculations.

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285/75R17 vs 285/70R17

We’ve prepared the above guide for you. We think that it will help you with our calculations.

At first look, the only difference between these two sizes is the middle element. It is ’70’ and ’75’. Yet, this ratio has a direct impact on tire height. Let’s calculate it together.

Height = (Width x Ratio)x2/25.4(1inch=25.4mm) + Rim Size 

In other words,

Height = (First Element x Second Element)x2/25.4 + Third Element

‘x2’ highlighted with red caused by two sides of the rim.

285/75R17

Height calculation :

Height = (285×0.75)x2/25.4 + 17 = 33,83 inches

285/70R17

Height calculation :

Height = (275×0,70)x2/25.4 + 17 = 32.15 inches

As you see, 5 points difference in a ratio equals 1.7 inches difference in tire height.

Please note that this calculation only works for the same patterns. Different tread depths can change tire height.

 

Where to Use It?

  • If you wanna increase your vehicle elevation, you can use the tire with higher ratio size
  • If the tire is too big and you don’t want to use a lift kit, you can use lower ratio size

Conclusion

These are the basics of tire size comparison. I hope the article was helpful!

  • A side note here: If you’d like to get local advice and find the best fit for your driving habits, location, and road conditions DiscountTire – Treadwell Tire Guide can give you masterpiece recommendations.

If you have any further questions or any other information content; please leave it in to comment section. I would love to help!

Guide Me Bruh!

This section contains my research and top picks. Depending on your need, you may choose a category and easily find the best fit for yourself. Remember, nobody knows your driving conditions and requirements better than yourself. You’re in the charge out here.

Start Here:

Blue-Ribbon Tires

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Be a Professional

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All-Weather Touring

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Highway-Terrain

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High Performance

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Filed Under: Tips&Advices Tagged With: 285/70R17, 285/75R17

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