Drag Radial Wheel Width vs Slick Rim Width: Chart for 15, 17 and 18-Inch Tires

Drag radial wheel width and slick rim width are not the same number. A Mickey Thompson ET Street R 275/60R15 drag radial is measured on an 8.0-inch rim and approved for 7.5 to 9.5 inches, while an ET Drag 28x10.5-15 bias-ply slick is measured on a 10-inch rim. That is why a 15x10 is the classic slick wheel, but a 15x8 or 15x9 is where most 275-width drag radials sit inside their published range.

This guide puts the tire makers' measuring-rim figures for drag radial wheel width and slick rim width into one chart, explains why radials and slicks want different widths, and shows how that choice changes backspacing on a Mustang, Camaro or Corvette.

Key facts

• The Mickey Thompson ET Street R 275/60R15 is measured on an 8.0-inch rim with an approved range of 7.5 to 9.5 inches (tiresize.com spec table, matching the maker's chart reproduced by Steeda).
• The ET Street R 305/45R17 is measured on a 10.0-inch rim (range 9.5 to 11.5 inches), which is why the 17x10 is the standard rear for S550 and S650 Mustang drag builds.
• The Mickey Thompson ET Drag 28x10.5-15 slick is measured on a 10-inch rim, so a 15x10 is the size the tire was designed around.

What does "measured rim width" mean?

Measured rim width is the wheel width a tire maker uses when it publishes the tire's overall diameter and section width. The approved range is the narrowest and widest wheel the tire may be mounted on. Inside that range the tire works as designed; outside it, the sidewall is either pinched or stretched.

Wheel width here is the bead-seat width, the number in "15x10". It is not the overall lip-to-lip width, which is about one inch wider and is the figure used for backspacing. Our drag wheel backspacing guide explains that difference with worked examples.

Drag radial wheel width vs slick rim width chart

Every size in this table appears with the same diameter, measuring rim and range in two independent listings: the tiresize.com specification table and the Mickey Thompson chart reproduced on Steeda's product page. Check your exact tire's current spec sheet before ordering, because compounds and constructions change.

Two patterns stand out. A 275/60R15 radial on a 15x10 is half an inch past its published maximum, and a 315/35R17 is half an inch short of its minimum on a 17x10. Both combinations are common at the track, but they sit outside the maker's range, so treat them as a decision you make knowingly rather than a default.

Why drag radial wheel width differs from a slick

A drag radial launches on a short, stiff sidewall, so its grip depends on the tire keeping the shape it was designed with. A bias-ply slick launches by wrinkling a tall, soft sidewall, and its measuring rim is the width at which that sidewall was designed to twist and recover.

That difference drives three practical rules:

1. Match the radial to its range first. Pick the drag radial wheel width from the chart, then pick offset. A radial mounted on a rim wider than its range has its sidewall pulled straighter, which changes how it absorbs the launch.
2. Run the slick on its measuring rim. For a 28x10.5-15 that is a 15x10; going narrower bunches the sidewall and changes how the tire wrinkles.
3. Use a beadlock whenever pressure drops low. Both tire types are run at low pressure for traction, and a beadlock ring clamps the outer bead so the tire cannot spin on the wheel. Our beadlock drag wheels guide covers single and double beadlock options.

How rim width changes backspacing on Mustang, Camaro and Corvette builds

Going one inch wider at the same offset moves the inner rim edge about half an inch closer to the strut, spring or frame rail. On a narrow-body car, that inch usually has to go inward, so the drag radial wheel width you choose from the chart sets the backspacing you need.

Start from the car's hub and rear clearance:

• Ford Mustang S550 and S650: 5x114.3 with a 70.5 mm center bore. The common drag setup is a 17x10 rear on a 305/45R17 radial; our S550 and S650 Mustang drag wheel sizes article lists fronts, rears and brake clearance. All Mustang generations are on the Ford Mustang bolt pattern page.
• Chevrolet Camaro: check the generation on the Chevrolet Camaro bolt pattern page before choosing a 15-inch slick wheel, because the brake package decides whether a 15 clears.
• Chevrolet Corvette C8: 5x120, listed on the Corvette C8 Stingray fitment guide. Measure caliper clearance before choosing a 15-inch wheel, and use a 17- or 18-inch radial from the chart if a 15 does not clear.

To convert any width and backspacing into offset, use the offset and backspacing calculator. For every car that shares a bolt pattern, see the 5x114.3 wheel size page or the 5x120 wheel size page.

Front runner width: keep it narrow

Drag radial wheel width rules apply to the rear only. Front runner tires are narrow bias-ply tires that only need to steer and roll with as little weight as possible. They are published with their own measuring rim, which is far narrower than any rear, so the front wheel is chosen from the front tire's spec sheet rather than the rear chart.

The 15x3.5 front in our backspacing guide and the 18x5 front from the Mustang guide are the two most common patterns. Check that the front wheel's barrel clears the factory brake caliper before you order, because a narrow 15-inch front often does not.

Forged drag wheels for radials and slicks

For a 17x10 rear on a 305/45R17 radial, a black machined 5-spoke beadlock drag wheel with a polished wavy ring gives you the clamping ring and a light five-spoke center. If you run a slick on a 15x10, the satin black mesh beadlock drag wheel is cut to the same bolt pattern and offset you specify.

Weld Racing-style and Belak-style designs in our catalogue are made in our own forging plant; they are styling references, not licensed products. Every wheel is drilled 5-lug to your car's pattern, and the beadlock versions take a bolt-on outer ring.

Related forged drag wheels