A WheelCovers.Com Field Guide

Hubcaps. Wheel Covers.
Wheels. Rims. Tires.

Five words, constantly confused — by shoppers, by mechanics, even in car ads. Here's the complete, plain-English breakdown of every part of your wheel assembly, and exactly how to identify each one on sight.

12 min read Buying Guides Premier Supplier Since 1979
Scroll to explore
Why It Matters

One wrong word, one wrong part.

"Hubcap," "wheel cover," "rim," and "wheel" get used interchangeably every single day. WheelCovers.Com's own buying guides exist precisely because that confusion leads shoppers to order the wrong part, the wrong size, or the wrong fit. This guide untangles all five terms for good.

5
distinct parts most people lump into just two words
1979
the year WheelCovers.Com started untangling this for buyers
60 sec
how long it takes to identify any of them with this guide
The Big Picture

The anatomy of a wheel assembly

Every wheel is built in layers — from the road-contact rubber on the outside, down to the decorative cap in the center. Identification starts with knowing which layer you're actually looking at.

Tire Wheel Rim Wheel Cover Hubcap

Tire

Rubber, air-filled, the only part touching the road.

Wheel

The full metal assembly, bolted to the vehicle's hub.

Rim

The wheel's outer lip, where the tire bead seats and seals.

Wheel Cover

A plastic cap that spans the wheel's entire face.

Hubcap

A small cap over only the center hub.

Part by Part

The 5 parts, up close

Swipe through — each card tells you what it is, how to spot it, and what it's most often mistaken for.

Scroll horizontally to see all five

Wheel

The complete circular metal assembly that mounts to the hub and carries the tire — spokes, disc face, bolt pattern and all.

  • Bolted directly to the hub via lug nuts
  • Visible bolt pattern in the center
  • Stamped steel or cast aluminum alloy
  • Sized by diameter & width in inches (17"×7.5")
Often mistaken for: "rim"

Rim

Technically just the outer metal edge of the wheel — the hoop where the tire's bead actually seats and seals. Not sold separately.

  • The outermost circular edge of the wheel
  • Tire bead sits and seals directly against it
  • Diameter here matches your tire size code
  • Curb rash shows up on this edge first
Often mistaken for: the whole "wheel"

Tire

The rubber, air-filled ring mounted onto the rim — the only part of the assembly that actually touches the road.

  • Black rubber with visible tread grooves
  • Sidewall stamped with a size code (P215/65R16)
  • Fully removable, replaced independently
  • Wears out; the wheel underneath usually doesn't
Rarely confused with anything else

Hubcap

A small, round cover that snaps or clips over only the center hub — protecting wheel bearings and lug nuts, WheelCovers.Com-style.

  • Covers only the center — bare wheel visible around it
  • Small diameter relative to the whole wheel
  • Clips, screws, or a center push-fit
  • Common on steel wheels to dress up a plain center
Often mistaken for: a wheel cover

Wheel Cover

A larger plastic disc that snaps over the entire wheel face, hub to rim edge — built to mimic a premium alloy wheel.

  • Covers the full wheel face, edge to edge
  • Diameter matches the full wheel size
  • Often molded with fake spokes or vents
  • Snap-on, tool-free installation
Often mistaken for: a hubcap
Side-by-Side

All five, compared

The fastest way to settle any argument about what's actually on your car.

PartCoversStructural?Typical materialCost tier
WheelN/A — it is the structureYes — load-bearingSteel or cast aluminum alloy$$$
RimN/A — outer edge of the wheelYes — seals the tireSame as the wheel (steel/alloy)Part of wheel
TireN/A — mounts onto the rimLoad + traction, not rigidRubber, steel belts, fabric cord$$
HubcapCenter hub onlyNo — cosmetic/protectivePlastic (ABS) or chrome metal$
Wheel CoverEntire wheel faceNo — cosmetic/protectiveDurable ABS plastic$$
Bonus Category

Wheel skins & wheel simulators

Two more terms from WheelCovers.Com's own catalog that shoppers frequently mix up with hubcaps and wheel covers.

Wheel Skins

A close cousin of the wheel cover: a snap-on ABS plastic shell that fits directly over an existing wheel to refresh its look. Sized precisely to the wheel diameter, installed by hand in minutes, no tools required.

Identify it: fits the whole wheel face like a wheel cover, but marketed as a style refresh rather than a factory-look replacement.

Wheel Simulators

Built mainly for trucks, vans, and dual-wheel setups — a full-face cover that simulates expensive stainless steel or chrome wheels over plain steel ones, often secured with a heavy-duty stainless retention band.

Identify it: larger, heavier-duty covers on commercial/utility vehicles, held on with a metal band rather than plastic clips alone.
Straight From Our FAQ

5 common misconceptions, debunked

Pulled directly from the questions WheelCovers.Com customers ask most.

Myth

"Hubcaps are just decoration."

Fact

They also shield wheel bearings and lug nuts from dirt and moisture, and can modestly improve aerodynamics.

Myth

"Hubcaps and wheel covers are the same thing."

Fact

Hubcaps cover only the hub; wheel covers span the entire wheel face, edge to edge.

Myth

"Only old cars wear hubcaps."

Fact

Manufacturers still produce stylish hubcap designs for current-model vehicles.

Myth

"Hubcaps offer no real protection."

Fact

They absorb minor curb and debris impacts that would otherwise scratch or dent the wheel.

Myth

"Once installed, covers never come loose."

Fact

Clips can loosen from bumps or temperature swings — a periodic check keeps them seated.

Field Guide

The 60-second identification checklist

Ask yourself these five questions, in order.

Is it black rubber with tread grooves?
Tire
Is it the full metal structure bolted to the hub?
Wheel
Is it just the outer lip where the tire bead seats?
Rim
Does the cover span the entire wheel face, edge to edge?
Wheel Cover
Does the cover only span the center hub, leaving the rest exposed?
Hubcap
FAQ

Frequently asked questions

Are hubcaps and wheel covers the same thing?

No. Hubcaps only cover the center hub of the wheel where the lug nuts are, leaving the rest of the wheel visible. Wheel covers span the entire face of the wheel, edge to edge, and often mimic the look of an alloy wheel.

Is a rim the same as a wheel?

Not technically. The wheel is the entire circular metal assembly bolted to the hub. The rim is specifically the outer lip of that assembly where the tire's bead seats and seals. In everyday slang the two words are used interchangeably, but the rim is only one part of the wheel.

What is the difference between a wheel skin and a wheel cover?

They're close cousins. Both are snap-on ABS plastic shells sized to fit over an existing wheel's full face. Wheel skins are typically marketed as a style refresh for a wheel you already like, while wheel covers are usually marketed to fully disguise a plain steel wheel as a higher-end alloy design.

Do hubcaps actually protect anything, or are they just decorative?

Hubcaps do more than decorate. They shield wheel bearings and lug nuts from dirt, moisture, and road debris, help prevent minor curb-related scratches and dents, and on some designs can modestly improve aerodynamics.

How can I tell a tire from a wheel or rim at a glance?

The tire is the only black rubber component with visible tread grooves; it is fully removable from the wheel and wears out over time. The wheel and rim are the rigid metal structure underneath it, made of steel or cast aluminum alloy, and typically last far longer than the tires mounted to them.

Now You Know

Ready to see the difference for yourself?

Browse hubcaps, wheel covers, wheel skins, and wheel simulators from the premier supplier since 1979 — sized and styled for your exact wheel.

Shop WheelCovers.Com Re-read the guide ↑