How Tall Are 245 70R17 Tires? | Exact Height And Fit

A 245/70R17 tire stands about 30.5 inches tall, measures about 9.6 inches wide, and turns roughly 661 times per mile.

That size shows up on many trucks and SUVs, and the number most drivers want is the full height. For a 245/70R17, that comes out to about 30.5 inches, or 774 mm. If you’re checking clearance in the wheel well, ride height, speedometer change, or garage fit, that’s the figure that matters.

There’s a bit more packed into that code than just height. Once you know what each part means, you can tell how tall the tire is, how much sidewall it has, and how it stacks up against nearby sizes without guessing.

How Tall Are 245 70R17 Tires? With The Full Math

The math is clean once you split the size into pieces:

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

Start with the sidewall. A 245 mm tire with a 70 aspect ratio has a sidewall height of 171.5 mm. Convert that to inches and you get about 6.75 inches.

Now add the wheel. Since the tire has sidewall above and below the wheel, the total diameter is 17 + 6.75 + 6.75. That lands at 30.5 inches.

What Those Numbers Mean In Daily Use

A 30.5-inch tire has a radius of about 15.25 inches, so half the tire sits below the axle centerline and half sits above it. That matters when you’re checking ground clearance, step-in height, and how much room you have near the fender liner at full lock.

The same size also has a circumference of about 95.8 inches. That works out to roughly 661 revolutions per mile. In plain terms, your vehicle’s gearing, speedometer, and odometer are all built around that rolling size when 245/70R17 is the stock fitment.

Why Tire Height Is Only One Part Of The Story

Two tires can share the same printed size and still not measure like twins on a spec sheet. Tread depth, casing shape, measured rim width, and load range can nudge the listed diameter a bit. So the math gives you the nominal size, while the brand’s catalog gives you the final product spec.

If you ever need a plain breakdown of sidewall markings, Goodyear’s tire size breakdown spells out width, aspect ratio, construction, and rim diameter in clear terms.

That said, the simple calculation is still the best first check. It tells you the general height, and it tells you fast. For 245/70R17, you can safely think “right around thirty and a half inches tall.”

245 70R17 Tire Height Compared With Nearby Sizes

A size on its own doesn’t tell you much until you stack it next to the common alternatives. That’s where the number gets more useful. You can spot which sizes sit lower, which ones add sidewall, and which ones are close enough to keep speedometer change small.

Tire Size	Overall Diameter	Difference Vs 245/70R17
225/75R17	30.29 in	-0.21 in
235/75R17	30.88 in	+0.38 in
245/65R17	29.54 in	-0.96 in
245/70R17	30.50 in	Baseline
245/75R17	31.47 in	+0.97 in
255/65R17	30.05 in	-0.45 in
255/70R17	31.06 in	+0.56 in
265/65R17	30.56 in	+0.06 in
265/70R17	31.61 in	+1.11 in

The close neighbors tell a useful story. A 265/65R17 is nearly the same height, so it changes the look more than the stance. A 245/75R17 adds almost an inch of total diameter, which means about half an inch of added ride height. A 245/65R17 drops nearly an inch, so the truck or SUV will sit lower and the wheel gap will look larger.

That’s why the printed size matters in two directions. Width changes how broad the tire is. Aspect ratio changes sidewall height. Wheel diameter anchors the whole package. Change one of those and the full tire height moves with it.

What 30.5 Inches Means On The Road

A 245/70R17 is tall enough to give a truck or SUV a solid sidewall without jumping into oversized territory. It usually strikes a nice middle ground between daily driving comfort and light trail use.

• Ride feel: The 70-series sidewall gives more cushion than a lower-profile 17-inch tire.
• Ground clearance: Tire diameter affects axle height by half the diameter change.
• Wheel-well fill: A 30.5-inch tire looks fuller than a shorter highway size.
• Speedometer accuracy: Staying with the stock diameter keeps the reading closest to factory calibration.
• Gearing feel: Taller tires can soften off-the-line response on some vehicles.

If your vehicle came with this size from the factory, you don’t need to sweat the math much after you’ve confirmed the number once. If you’re moving to or from this size, the math gets more useful because even a half-inch shift in tire height can change fitment more than most drivers expect.

Measure	245/70R17 Value	Why It Matters
Section Width	245 mm / 9.65 in	Sets the tire’s nominal width
Aspect Ratio	70	Sets sidewall height as a share of width
Sidewall Height	171.5 mm / 6.75 in	Affects ride feel and total diameter
Wheel Diameter	17 in	Must match the wheel exactly
Overall Diameter	30.50 in / 774 mm	Drives fitment and stance
Circumference	95.83 in	Ties into speedometer and odometer readings
Revolutions Per Mile	About 661	Shows how often the tire turns in one mile

Before You Buy Or Swap

Height alone isn’t enough when you’re picking a replacement. The code after the size matters too. A P245/70R17 and an LT245/70R17 can be close in height, yet they can differ in load capacity, pressure, casing stiffness, and ride feel.

The USTMA replacement tire guidance says your replacement tire should match the vehicle maker’s size, load index, and speed rating unless you’ve confirmed a safe fit with the right data.

Run Through These Checks Before Ordering

• Read the driver-door placard and owner’s manual
• Match the 17-inch rim diameter exactly
• Check load index and speed rating, not just the size
• Confirm wheel width works with the tire you want
• Check for strut, liner, and mud flap clearance
• Watch front clearance at full steering lock
• On AWD and 4WD setups, keep tire diameters closely matched across all corners

That last point saves a lot of grief. A size that looks close by eye can still be off enough to cause rubbing or calibration quirks. Tires live in tight spaces, so a small paper difference can turn into a real fitment issue once the suspension compresses.

The Number To Save

If all you needed was the height, here it is again: a 245/70R17 tire is about 30.5 inches tall. The sidewall is about 6.75 inches, the width is about 9.65 inches, and the tire rolls about 661 times per mile.

That makes it a useful reference size. It’s tall enough to suit many trucks and SUVs, easy to compare against nearby sizes, and simple to work out with a bit of sidewall math. Once you know the 30.5-inch figure, the rest of the fitment picture gets a lot easier to read.