315/70R17 Tire Size Guide

The 315/70R17 size code identifies a metric radial tire with a 315-millimeter section width, a sidewall height equal to 70 percent of that width, radial construction, and a 17-inch wheel diameter. In this size, the calculated sidewall height is 220.5 millimeters, or 8.68 inches, and the overall diameter works out to about 34.36 inches.

Unlike older numeric or alphanumeric sizes, 315/70R17 spells out width, profile, construction, and rim diameter in one line. What it does not tell you by itself is wheel width range, load capacity, tread type, or whether a particular tire is meant more for highway, all-terrain, or specialty use. Buyers should read the full sidewall and compare overall diameter and section width before substituting from another size.

The 315/70R17 fits a 17.0-inch wheel, which equals 431.8 millimeters at the bead seat. The 17 in the size code is the wheel diameter and must match exactly for the tire to mount properly.

Wheel diameter is only one part of the fitment picture. A tire can have the correct 17-inch diameter and still be wrong for the wheel if the rim is too narrow or too wide for the tire's intended profile. Buyers should also confirm actual wheel width, bead-seat design, and clearance at suspension and body points before installation, especially on trucks and SUVs where offsets and steering travel can vary widely.

The 315/70R17 has a section width of 315 millimeters, which is about 12.40 inches. Section width measures the tire at its widest point from sidewall to sidewall when inflated, not the tread face that actually contacts the road.

Clearance questions usually start with section width because sidewall bulge is what approaches fenders, frame rails, suspension links, and inner liners first. Tread width is usually narrower, so relying on tread measurements alone can lead to surprises. On a large size like 315/70R17, buyers should check turning clearance, vertical suspension travel, and wheel offset along with width to understand how the tire will sit in the vehicle.

The 315/70R17 has a calculated overall diameter of 34.36 inches, or about 872.7 millimeters. That is the full height of the mounted, inflated tire from the ground to the top of the tread when measured through the center.

Overall diameter matters because it affects ride height, wheel-opening fill, gearing feel, and speedometer behavior. A change in diameter can also influence how a truck or SUV looks and how closely the tire approaches fender edges at full compression. When comparing the 315/70R17 to another size, diameter is one of the first measurements to line up, especially if you want to preserve current stance and avoid unexpected clearance issues.

The 315/70R17 has a calculated sidewall height of 8.68 inches, which is 220.5 millimeters. That measurement runs from the wheel's bead seat to the outer edge of the tread on one side of the tire.

Sidewall height influences ride compliance, visual proportion, and how much the tire fills the space between the wheel and the road. A 70-series sidewall is substantial enough to give the tire a taller profile than lower-series truck sizes on the same wheel diameter. For buyers comparing alternatives, sidewall height helps explain why two 17-inch tires can look and feel very different even when they mount on the same wheel.

The 315/70R17 turns about 586.9 revolutions per mile. That figure comes from the tire's circumference, which is approximately 107.95 inches, and it describes how many complete rotations the tire makes over one mile of travel.

Revolutions per mile are useful when comparing substitute sizes because they relate directly to speedometer and odometer behavior. A tire with a meaningfully different revs-per-mile figure will cover more or less distance per rotation, which changes how the vehicle interprets road speed. For buyers moving between nearby truck sizes, this number helps show whether the change is minor or large enough to affect everyday driving and stance.

The 315/70R17 is commonly associated with light truck and SUV applications, especially larger or off-road-oriented vehicles that use a 17-inch wheel and need a tall, wide tire. Vehicle examples in this size range from 2003 through 2026 and include truck and utility platforms rather than passenger-car fitments.

Fitment still depends on more than the size code alone. Wheel width, offset, suspension setup, brake clearance, and body clearance all affect whether the 315/70R17 works cleanly on a specific vehicle. Even when a truck or SUV appears in a vehicle list, buyers should compare the full tire specification and physical clearances instead of assuming every version of that platform uses the same wheel-and-tire package.

The 315/70R17 can sometimes serve as a replacement candidate for another 17-inch truck size, but matching rim diameter alone is not enough. Its 12.40-inch section width and 34.36-inch overall diameter can change clearance, steering sweep, wheel-opening fill, and speedometer behavior compared with narrower or shorter alternatives.

Substitution decisions should start with the vehicle's current tire dimensions, wheel specifications, and intended use. Buyers who want to preserve stance and road manners usually compare overall diameter first, then section width and load requirements. If the goal is a wider look or more sidewall, the 315/70R17 may be attractive, but it still needs enough room at the fenders, suspension, and full lock in both directions.

Yes, wheel setup matters a great deal with the 315/70R17 because this is a wide, tall radial size intended for a 17-inch rim. Diameter must match exactly, and wheel width and offset influence how the tire's sidewalls sit and how close the tire runs to control arms, liners, and outer body edges.

Offset and backspacing can change real-world fit just as much as the size code does. On trucks and SUVs, a wheel that pushes the tire outward may improve inner clearance while creating fender rub, and a wheel that tucks inward can do the opposite. Buyers should measure the current setup and check clearance through full steering and suspension travel before committing to the 315/70R17.

The 315/70R17 combines radial construction with a relatively tall 70-series sidewall, so it tends to emphasize a fuller, more cushioned profile than a lower-series truck tire on the same wheel diameter. Its 8.68-inch sidewall gives the tire more visual depth and more sidewall to absorb irregularities than a shorter-profile alternative.

Ride feel still depends on the vehicle, suspension condition, inflation, load, and the specific tire design chosen in this size. A truck with firm springs and aggressive wheel offset can behave very differently from a stock SUV on the same size. Buyers usually choose 315/70R17 when they want substantial sidewall presence without stepping away from a modern radial driving character.

On the 315/70R17, radial construction means the carcass cords run perpendicular to the direction of travel rather than crossing at angles as they do in a bias ply tire. That construction type is standard in modern truck and SUV fitments and is generally chosen for the more familiar road manners expected in regular use.

Driving behavior is still shaped by alignment, tire age, tread design, wheel setup, and load carried. A fresh radial in the correct size will not compensate for worn steering parts or marginal clearance. For buyers using a truck or SUV routinely, the 315/70R17 fits squarely into a modern driving context, but the complete wheel-and-tire system still needs to be matched carefully.

Because the 315/70R17 stands about 34.36 inches tall and turns roughly 586.9 revolutions per mile, it can noticeably change both stance and indicated speed when compared with a shorter or taller replacement size. Its wide 12.40-inch section width also affects how planted and substantial the vehicle looks in the wheel opening.

A taller substitute generally fills the wheel opening more and reduces revolutions per mile, while a shorter one does the opposite. Width changes matter too, since a wider sidewall footprint can alter clearance at steering lock and suspension compression. Buyers comparing alternatives should look at diameter, revs per mile, and section width together rather than treating the rim diameter as the whole story.

A good 315/70R17 should match the vehicle's actual use, wheel setup, and load needs before anything else. In a size this large, quality is not only about brand reputation but also about choosing the right construction type, accurate sizing, and a tire specification that suits the truck or SUV's weight, clearance, and driving pattern.

Consistency matters across the full set. Buyers should compare the full sidewall description, confirm the exact size code, and make sure all four tires share the same construction and intended use. With a 315/70R17, small differences in actual mounted dimensions can affect steering clearance and stance more than they would in a narrower size, so careful matching is worthwhile.

The 315/70R17 usually appeals to buyers who want both. Its radial construction supports modern everyday use, while its 70-series profile and substantial width create the tall, full look many truck and SUV owners prefer. The size carries a strong visual presence without abandoning the familiar dimensions of a 17-inch wheel package.

Buyers with authenticity goals should also think about the vehicle's era and original equipment intent. A radial can improve day-to-day usability, but a judged restoration may call for closer attention to what the vehicle originally wore. For most regular-use trucks and SUVs, the real decision is less about show-field authenticity and more about balancing stance, clearance, and practical road use.

Full-set consistency matters with the 315/70R17 because width, overall diameter, and construction all influence how the vehicle sits and drives. Mixing different constructions or noticeably different actual dimensions in a large truck size can create uneven appearance, inconsistent handling feel, and avoidable fitment headaches.

Matching all four tires helps preserve predictable behavior and a balanced stance. On vehicles that see regular road use, it also makes rotation and wear monitoring simpler. Even when two tires share the same 315/70R17 code, buyers should still confirm that the set is uniform in specification and intended use so the vehicle behaves consistently from corner to corner.

The 315/70R17 should be inspected regularly for cuts, cracking, bulges, punctures, uneven wear, and signs of air loss, especially on vehicles that see highway speeds, towing duty, or rough-surface use. A large truck tire can look serviceable at a glance while still developing wear patterns that point to alignment, inflation, or suspension issues.

Routine checks are especially important because this size is often used on heavier trucks and SUVs where loads and steering angles can stress the tire differently than on a passenger car. Buyers should inspect the full tread and both sidewalls, not just the outer face, and review the condition before long trips or demanding use where heat and load can expose underlying problems.

The 315/70R17 is normally a tubeless fitment. Even so, tube use is a wheel-and-tire-system question rather than a size question, so the final answer should always be confirmed against the actual wheel and the specific tire being used.

Wheel condition, rim design, and the tire's own sidewall markings are what settle the question in practice. If a truck or SUV has aftermarket wheels, older specialty wheels, or any unusual bead-seat arrangement, it is smart to verify tube guidance before mounting. Buyers should rely on the actual wheel and tire combination rather than assuming the size code alone makes the decision.

A seasonally used vehicle on 315/70R17 tires still needs regular pressure checks and visual inspection even when mileage stays low. Time, heat, sunlight, ozone exposure, and long stationary periods can age tires whether or not the tread is heavily worn.

During storage, keep the vehicle away from direct sunlight, moisture, and ozone sources such as electric motors or welders. If the truck or SUV sits for extended periods, moving it occasionally can help reduce flat spotting. Before putting it back into regular service, inspect the tires closely for cracking, weathering, impact damage, and any irregular wear that may have gone unnoticed during storage.

The 315/70R17 should be replaced when age or condition raises concern, not just when tread depth is low. Cracking, bulges, repeated air loss, impact damage, uneven wear, or vibration can all be signs that the tire needs closer evaluation even if the tread face still appears usable.

Time matters as much as mileage, especially on vehicles that alternate between daily use and long idle periods. Buyers should check the tire's current sidewall markings, inspect the casing before road trips, and have questionable tires evaluated by a qualified tire professional. On a large truck or SUV size, delaying replacement after visible deterioration can turn a manageable issue into a roadside problem.

No, the 315/70R17 is not automatically suitable for every 17-inch wheel just because the diameter matches. Wheel width, offset, bead-seat design, vehicle clearance, and the tire's own load requirements all need to line up with the actual application.

A diameter match only confirms that the tire can seat on that wheel size in principle. Real-world safety depends on using a compatible wheel and maintaining enough space at suspension, steering, and body contact points through full travel. Buyers should confirm the wheel specification and inspect for interference rather than assuming any 17-inch rim is an acceptable match for the 315/70R17.

Before using the 315/70R17 on modern roads, buyers should verify tire condition, wheel compatibility, vehicle clearance, and the load requirements of the vehicle. They should also review the current sidewall markings on the actual tire and confirm that the full wheel-and-tire package matches the intended use.

Modern road use places steady demands on a truck tire through speed, heat, braking, and sustained load. A tire in the right size can still be the wrong choice if it is aged, damaged, improperly mounted, or paired with an unsuitable wheel. Careful inspection before long trips and a realistic check of how the vehicle is driven go a long way toward making the 315/70R17 a sound fitment decision.