How Tall Is A 245 70R17 Tire? | Real Size In Inches

This tire size stands about 30.5 inches tall, or 775 mm, before small brand-to-brand differences.

If you just want the number, a 245/70R17 tire is about 30.5 inches tall. That equals about 775 mm from top to bottom when you use the standard tire-size formula. On a real tire, the catalog figure can land a hair above or below that paper number.

That matters when you’re checking garage clearance, swapping wheel and tire sizes, or trying to see whether a new set will rub at full lock. A half-inch can change how a truck or SUV sits, how the speedometer reads, and how much room you have near the fender liner.

How Tall Is A 245 70R17 Tire? The Size Math

The answer comes from the three numbers on the sidewall. Tire makers break that code into width, aspect ratio, and wheel diameter. Once you read those three parts, the height is easy to work out.

What 245/70R17 means

Here’s the breakdown:

• 245 = the tire’s section width in millimeters
• 70 = the sidewall height as 70% of the width
• R = radial construction
• 17 = the wheel diameter in inches

A lot of people trip over the middle number. The 70 is not 70% of the whole tire height. It only refers to one sidewall. That’s why you have to calculate the sidewall first, then double it, then add the 17-inch wheel.

So the sidewall height is 70% of 245 mm. That gives you 171.5 mm. Convert that to inches and you get about 6.75 inches of sidewall on one side.

Step-by-step height calculation

Use this formula:

Overall tire height = wheel diameter + 2 × sidewall height

1. Width: 245 mm
2. Sidewall height: 245 × 0.70 = 171.5 mm
3. Sidewall height in inches: 171.5 ÷ 25.4 = 6.75 inches
4. Overall height: 17 + 6.75 + 6.75 = 30.50 inches

That’s the standard math answer: 30.50 inches. In metric terms, 30.50 × 25.4 gives you 774.7 mm.

Width and height are not the same thing

The tire is 245 mm wide, but it is not 245 mm tall. Width is the section width, measured across the sidewalls. Height is the full diameter from top to bottom. Those two numbers are tied together by the aspect ratio, which is why a 245/70R17 stands taller than a 245/65R17 while both have the same width.

What that looks like on the vehicle

A 30.5-inch tire is a common light-truck and SUV size. It’s tall enough to fill out the wheel opening on many midsize trucks, body-on-frame SUVs, and older half-ton models without jumping into oversized territory.

Radius is half the diameter, so this tire’s radius is about 15.25 inches. Circumference comes out to about 95.8 inches. Those two numbers help when you’re checking ride height changes or trying to estimate speedometer error against another size.

Measurement	What It Means	Value For 245/70R17
Section width	Sidewall width at the widest point	245 mm
Section width in inches	Metric width converted to inches	9.65 in
Aspect ratio	Sidewall height as a share of width	70%
One sidewall height	245 × 0.70	171.5 mm
One sidewall in inches	171.5 ÷ 25.4	6.75 in
Wheel diameter	Wheel size the tire fits	17 in
Overall tire height	17 + 2 × 6.75	30.50 in
Overall tire height in mm	Overall diameter in metric form	774.7 mm
Radius	Half of overall height	15.25 in
Circumference	Distance around the tire	95.8 in

If you want the official breakdown of the size code itself, Bridgestone’s tire size explainer shows the same width, aspect-ratio, and rim-diameter layout used in the math above.

Why real tires don’t always measure the same

Paper math gives you the nominal size. Real tires can land a little above or below that because tread depth, casing design, and the measuring rim width all change the finished spec. That’s why two 245/70R17 tires from two brands can share the same size code and still show a small gap in listed height.

You can see that in live product data. Goodyear’s 245/70R17 spec page lists an outside diameter of 30.55 inches for one Wrangler Territory HT fitment. That’s only 0.05 inch taller than the formula result, which is close enough to confirm the math while showing why catalog specs are worth a look before you buy.

Loaded height can look shorter

Once the tire is mounted on the vehicle, the part touching the ground flattens a bit. So when you park next to a tape measure, what you see on the truck may not match the catalog diameter to the last fraction. Tire pressure, wheel width, and tread wear can nudge the visual height too.

New tread and worn tread don’t stand the same

A fresh tire has full tread depth. As that tread wears down, the overall diameter shrinks. The drop is not huge on a day-to-day basis, though it is enough to change a side-by-side measurement between a new tire and one that has seen plenty of miles.

245 70R17 Tire Height In Common Use

This size usually lands in a sweet spot for drivers who want decent sidewall without a giant jump in tire height. You get more cushion than a shorter 65-series tire, but you don’t step as far up as a 75-series size. That balance is why 245/70R17 shows up on many SUV and truck trims.

If you’re swapping from another 17-inch size, the first thing to watch is diameter change. Width matters too, though height tends to be the number that causes rubbing, changes gearing feel, and nudges the speedometer off its original reading.

How it compares with nearby sizes

Here’s where 245/70R17 sits next to a few common alternatives:

Tire Size	Overall Height	Change Vs 245/70R17
245/65R17	29.54 in	-0.96 in
245/70R17	30.50 in	Baseline
245/75R17	31.47 in	+0.97 in
255/70R17	31.06 in	+0.56 in
265/70R17	31.61 in	+1.11 in

What this height changes on your vehicle

Ground clearance

If you move from a smaller tire to 245/70R17, the axle only rises by half the diameter increase. So a one-inch jump in tire height raises clearance by about half an inch, not a full inch.

Speedometer reading

A taller tire covers more distance in one full turn. If you switch from a shorter size, the speedometer can read a bit slow. Say your stock tire is 29.5 inches tall and you step up to 30.5 inches. When the speedometer shows 60 mph, your real speed will be a touch higher.

Wheel-well room

Overall height tells you how much tire you’re trying to fit under the fender. Width tells you how much room you need side to side. When rubbing happens, it often shows up on the liner, mud flap, or rear edge of the front wheel opening during turns or suspension travel.

Ride feel and stance

A taller sidewall usually adds a little more cushion over broken pavement. It also gives the vehicle a fuller look around the wheel opening. That visual change is one reason people shop by diameter, not only by width.

Best way to check fit before you order

If you’re trying to see whether this size will fit your vehicle, don’t stop at the paper diameter. Use a simple check list:

• Read the driver-door placard for the stock tire size
• Compare the stock diameter with 30.5 inches
• Check wheel width against the tire maker’s approved range
• Look for brake-line, strut, and liner clearance at full lock
• Factor in tread style, since all-terrain patterns can run taller than highway tires in the same size code

If your truck or SUV already came with a tire close to 30.5 inches tall, a 245/70R17 swap is usually easy. If your stock tire is far shorter, check the fit with more care before you hit the buy button.

The number most readers need

A 245/70R17 tire is about 30.5 inches tall. That works out to 774.7 mm or just under 2.54 feet. For daily fitment checks, round it to 30.5 inches. For side-by-side tire shopping, use the brand’s catalog spec and approved rim-width range so you don’t get caught by a small but annoying size difference.