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Wheel Offset Explained: ET, Poke, Flush and Tuck (Redlined 101, Ep 01)

5 min read

Front cutaway of a lowered car’s corner showing the wheel centerline, the mounting pad and the fender, with the tire tucked under it.

Same car, same tires. One sits wide and aggressive, the other tucks under the fenders. One number decides it: offset. Here's the whole thing, from the parts involved to what the community actually respects.

Watch Redlined 101, Ep 01 on Instagram Watch on Instagram
@redlined.cc · Oct 6, 2026

Where we're looking from

Every diagram here is drawn from the front of the car, looking at the wheel on the right of the picture. The middle of the car is to the left; the street side is to the right. Then we slice that corner in half, straight through the center of the wheel.

Front corner of a car cut in half through the wheel: strut, knuckle, hub, rotor and wheel, with 'middle of car' to the left and 'street side' to the right.
The view used in every diagram: from the front, cut through the wheel.

The parts

  • The strut holds the car up.
  • The hub is what the wheel bolts to, and it never moves.
  • The wheel has an outer lip, a barrel that holds the tire, and a face with the spokes.
  • The mounting pad is the flat surface on the back of the face that bolts against the hub.

What offset is

Draw a line down the middle of the wheel's width. That's the centerline. Offset is the distance from that centerline to the mounting pad, in millimeters. It's stamped on the wheel as ET (from the German Einpresstiefe), like the ET35 in episode zero.

  • Positive offset: the pad sits street-side of the centerline. Higher numbers tuck the wheel in further.
  • Negative offset: the pad sits behind the centerline, and the wheel pushes out. That's where deep, dished lips come from.
  • Wheel cutaway at ET +58: the mounting pad sits well street-side of the centerline and the wheel tucks under the fender.
    ET +58: high positive offset tucks the wheel in.
  • Wheel cutaway at ET -15: the mounting pad sits behind the centerline, the wheel pushes out and a deep lip appears.
    ET −15: negative offset pushes it out, and the lip gets deep.
  • Wheel cutaway at ET +42 with the tire top tucked under the fender, labelled TUCK.
    Compare the tire to the fender: poke, flush or tuck.

Now compare the tire to the fender. Sticking out past it is poke. Level with it is flush. Hidden underneath is tuck.

How suspension changes the fit

Here's what most people miss: lowering usually tilts the top of the wheel inward. That's negative camber, and it pulls the top of the tire away from the fender. It's how stance builds fit such aggressive wheels.

The cost is grip, and tire wear on the inner edge, so most street builds keep it mild. Episode three covers camber, toe and caster in full.

The same corner lowered 44 mm with negative camber: the top of the wheel tilts inward and tucks under the fender.
Negative camber pulls the top of the tire in, away from the fender.

Why fender rolling matters

Every bump pushes the wheel up into the fender, and a lowered car has less room to give. Inside the fender is a folded lip of sheet metal. Hit it, and it can cut your tire or bend the fender.

Rolling the fender folds that lip flat for more clearance. Go slow, with heat, so the paint doesn't crack.

Close-up of the fender lip folded flat over the tire, with heat applied, labelled CLEARS.
A rolled lip clears the tire. Heat keeps the paint from cracking.

Respect vs. ricer

  • What gets respect: flush, or a hair of tuck, on a properly lowered car.
  • Has a purpose: a little poke on a wide track setup.
  • Its own style: big-camber stance. Love it or hate it.
  • What gets you called a ricer: stacked cheap spacers on stock suspension, wheels hanging out, tires chewing the fenders.
Four car rear views: flush and track poke ticked, stance neutral, and spacers on stock height marked ricer.
Flush and track poke get respect. Spacers on stock height don't.

Working out what a change will do

Offset changes are easy to predict once you know two rules:

  1. Every millimeter of offset moves the whole wheel one millimeter. Going from ET45 to ET35 moves both the inside and the outside of the wheel 10 mm toward the fender.
  2. Extra width splits roughly in half. One inch of extra width (25.4 mm) at the same offset adds about 12.7 mm on the inside, toward the suspension, and 12.7 mm on the outside, toward the fender.

Put together: a 9.5-inch wheel at ET35 replacing an 8.5-inch wheel at ET45 sits about 22.7 mm further out on the outside edge (10 mm from offset plus 12.7 mm from width) and about 2.7 mm closer to the strut on the inside. Online fitment calculators do this arithmetic for you, but knowing where the numbers come from keeps you from trusting a typo.

Check both sides, not just the fender

Poke is the obvious failure, but the inside matters as much. A low-offset, wide wheel can clear the fender and still rub the strut, the spring perch or the brake caliper. Big brake kits are the usual surprise: a caliper that fit the factory wheel's spokes can hit a wheel with a flatter face. Before you buy, check:

  • The inner barrel against the strut and spring perch, with the steering at full lock both ways.
  • The spoke face against the caliper. Many wheel makers publish caliper-clearance templates.
  • The tire against the fender lip with the suspension compressed, not just parked.

Spacers: the cheap way to change offset

A spacer lowers effective offset by its thickness: a 10 mm spacer on an ET45 wheel behaves like ET35. Quality matters here. A good hub-centric, bolt-on spacer with its own studs and the correct lug seats is a normal part of fitment. Stacking thin, generic spacers on longer studs is the ricer move from the list above: it puts the load in the wrong places and loosens over time.

Recap

Offset is the distance from the centerline to the mounting pad. Higher tucks, lower pokes. Camber, ride height and rolled fenders decide what actually fits.

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Previous: ← How to read wheel specs · Next: coilovers vs lowering springs (Oct 15)

Frequently asked questions

Is a lower offset better?

Not by itself. Lower offset pushes the wheel out for a wider stance, but too far causes poke, fender rub and heavier steering. The right offset is the one that sits flush on your car at your ride height.

How do I find the right offset for flush fitment?

Start from your car's factory offset, measure the room between the tire and the fender, then use the rule that each millimeter of offset moves the wheel one millimeter. Fitment calculators and test-fitting a wheel confirm it.

Do wheel spacers change offset?

Yes. A spacer reduces effective offset by its thickness. Use quality hub-centric spacers with the correct studs and lug seats, never stacked thin spacers.

Does offset affect handling?

It can. Moving the wheel outward changes the scrub radius, which can make steering heavier and more sensitive to bumps and braking. Small changes are rarely noticeable; large ones can be.