235/85R16 Tire Size Explained: Specs, Height, and Rim Width

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A 235/85R16 tire is about 31.7 inches tall, 9.3 inches wide, and mounts on a 16-inch wheel with a 6.0–7.5 inch rim width.

That single quirk explains why the 235/85R16 sits in a class of its own among light-truck tires. Below is the full decoding, the real-world dimensions, the load numbers you’ll actually see at the dealer, and the mistakes that catch people out.

What Each Number In 235/85R16 Means

The string breaks into four parts: 235 is the section width in millimeters, 85 is the sidewall height as a percentage of that width, R signals radial construction, and 16 is the rim diameter in inches.

So the sidewall height isn’t given to you directly — you calculate it. Multiply 235 by 0.85, and you get about 199.8 mm, or roughly 7.9 inches of sidewall per side.

  • 235 — section width, about 9.3 inches at the tread bulge
  • 85 — aspect ratio; sidewall is 85% of the width
  • R — radial ply construction
  • 16 — fits a 16-inch wheel, nothing else

One thing trips up almost every first-timer: the 235 mm figure is section width, measured sidewall-to-sidewall. It is not tread width, so the actual contact patch can run narrower.

How Tall Is A 235/85R16 Tire, And What Rim Fits It?

Overall diameter works out to about 31.7 inches (805 mm), making the 235/85R16 a distinctly tall, narrow tire — closer to a 32-inch class than a 30. Rim width is commonly listed between 6.0 and 7.5 inches, with 6.5 inches serving as the measuring rim on some sources.

Spec Metric Inches
Section width 235 mm 9.3 in
Sidewall height 199.8 mm 7.9 in
Overall diameter 805 mm 31.7 in
Rim diameter — 16 in
Rim width range 152–190 mm 6.0–7.5 in

That rim range is a compatibility gate, not a suggestion. A 235/85R16 will not mount on a 15-inch or 17-inch wheel, and the width range shifts slightly by tire model — check the specific sidewall or spec sheet before buying wheels.

Load Indexes, Ratings, And Why They Differ By Tire

Every 235/85R16 tire does not carry the same load, speed, or tread figures — those are set by the individual model, not the size. Snowflake ratings and ply ratings vary the same way.

Common load indexes on light-truck versions include 120/116, 120Q, and 120S. On a dual-index LT tire like 120/116, the first number applies to single-wheel mounting and the second to dual-wheel setups. Real max-load examples: a listed 120/116 tire carries 3,086/2,756 lb, a Michelin XPS Rib listing shows 3,085/2,756 lb, and a Cooper Discoverer AT3 listing shows 3,042 lb.

If you’re weighing specific models against each other, our tested roundup of 235 85r16 tires breaks down where each one lands on load and tread.

Inflation pressure is the other moving target. Max load figures assume the tire is inflated to the pressure the manufacturer specifies for that load — so never run a 235/85R16 at a pressure borrowed from a different tire, even one the same size.

Common Mistakes To Avoid

The biggest error is treating 235/85R16 as a wheel size rather than a tire size. It describes the rubber, not the rim — the rim here is simply 16 inches.

  • Confusing the 235 mm section width with tread width
  • Assuming all 235/85R16 tires share a load index or speed rating
  • Overlooking that single and dual listings mean different limits
  • Buying a tire before checking your rim’s approved width range

FAQs

Is 235/85R16 the same as a 32-inch tire?

Close, but not exact. The calculated overall diameter is about 31.7 inches, which most people round to a 32-inch tire. Actual mounted height depends on tread depth, inflation, and load, so expect a small variance between models.

Can I put a 235/85R16 on a 7.5-inch rim?

Yes, in most cases. The commonly listed rim width range for this size is 6.0 to 7.5 inches, so a 7.5-inch rim sits at the outer edge of that range. Confirm against the specific tire model’s approved rim width before mounting.

What does the 85 mean in 235/85R16?

It’s the aspect ratio — the sidewall height expressed as a percentage of the section width. Multiply 235 mm by 0.85, and the sidewall comes out to about 199.8 mm, or roughly 7.9 inches. Higher numbers mean taller sidewalls on the same width.

References & Sources

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