285/70r17
04-29-2016, 07:28 PM
#1
285/70r17
I'm sure this question has been tossed around frequently but I could never really get an answer after searching the web. So here it is.. 285/70r17... Is it a true 33? Or is it a 32? Thanks in advance
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PawPaw (05-05-2016)
05-02-2016, 07:47 AM
#7
Senior Member
My 285/70-17s are also stamped 33x11.50 on the same tire.
There is a lot of confusion on the Web about tires and "running true to size". A tire manufacturer measures tires including the bulge of the sidewalls and while mounted to a specific width rim at a particular air pressure. That's where they get the measurements listed on their info sheets.
If you measure from the ground up without including the sidewall bulge, or if you use a different width wheel, or different air pressure, or with the weight of the truck on the tire, etc....you will get a different measurement.
So it's NOT that the measurements listed are wrong. It's just that everybody measures differently.
If you put a 285/70-17 next to a 33x12.50-17 you'll find that they are virtually identical depending on brand.
There is a lot of confusion on the Web about tires and "running true to size". A tire manufacturer measures tires including the bulge of the sidewalls and while mounted to a specific width rim at a particular air pressure. That's where they get the measurements listed on their info sheets.
If you measure from the ground up without including the sidewall bulge, or if you use a different width wheel, or different air pressure, or with the weight of the truck on the tire, etc....you will get a different measurement.
So it's NOT that the measurements listed are wrong. It's just that everybody measures differently.
If you put a 285/70-17 next to a 33x12.50-17 you'll find that they are virtually identical depending on brand.
The following users liked this post:
HunterC96 (05-02-2016)
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05-02-2016, 12:54 PM
#8
My 285/70-17s are also stamped 33x11.50 on the same tire. There is a lot of confusion on the Web about tires and "running true to size". A tire manufacturer measures tires including the bulge of the sidewalls and while mounted to a specific width rim at a particular air pressure. That's where they get the measurements listed on their info sheets. If you measure from the ground up without including the sidewall bulge, or if you use a different width wheel, or different air pressure, or with the weight of the truck on the tire, etc....you will get a different measurement. So it's NOT that the measurements listed are wrong. It's just that everybody measures differently. If you put a 285/70-17 next to a 33x12.50-17 you'll find that they are virtually identical depending on brand.
05-04-2016, 06:42 AM
#10