Poke and Tuck Explained: Where Your Wheel Sits vs the Fender
Every wheel setup on earth does one of two things at the fender: it pokes, or it tucks. Poke means the outer face of the wheel and tire sits past the fender lip; tuck means it hides inside it. The entire visual identity of a build — and a good chunk of its legality and practicality — comes down to which side of that line you're on and by how many millimeters. This guide covers the math, the taste, and the limits.
The measurement that defines both
Both terms describe the same measurement from opposite signs: the horizontal distance between the outermost point of the wheel/tire package and the fender lip, taken at axle height. Positive numbers are poke; negative numbers are tuck. Three inputs set it:
- Width — half of every extra inch (12.7mm) goes toward the fender.
- Offset — every millimeter of ET drop moves the whole wheel 1mm outward. (New to offset? Start with our offset explainer.)
- The car itself — a fender-to-hub measurement taken on the exact car at its actual ride height and alignment. The database does not supply this measurement.
The tire adds a wrinkle: its sidewall usually bulges a few millimeters past the rim lip (unless stretched), so the rubber — not the wheel — is often the first thing to reach the fender. Camber adds the final adjustment: negative camber leans the top of the tire inward, which pulls the upper sidewall away from the lip and effectively converts some poke back into clearance right where fenders rub.
How much poke is acceptable?
| Fender position | Reading | What it means in practice |
|---|---|---|
| Negative | Tuck | The measured outer tire edge is inboard of the measured fender reference |
| Near zero | Near flush | Measurement uncertainty and tire variation can change the result |
| Positive | Poke | The measured outer tire edge is outboard of the measured fender reference |
Legality varies by jurisdiction: many US states and most European inspection regimes require the tire tread to be covered by bodywork. Mild poke where the lip of the wheel passes the fender but the tread stays covered often skates through; tread past the fender is a fix-it ticket almost everywhere that inspects.
Tuck isn't free either
Chasing deep tuck has its own failure mode: inner clearance. Every millimeter you don't use toward the fender is a millimeter the wheel package sits closer to the strut, control arm, or inner fender liner. High-offset, wide-wheel combinations that tuck beautifully can contact the suspension long before the fender ever mattered — it's the least photogenic and most expensive way to discover your inner clearance number. Check both sides of the envelope, not just the pretty one.
Measuring poke on a real car
- Hang a plumb line (string + nut) from the fender lip at the axle centerline.
- Measure horizontally from the string to the wheel lip and to the widest tire bulge — the larger value is your current poke/tuck.
- Measure front and rear independently and check both sides because production and alignment tolerances can differ.
Getting from tuck to flush (without buying twice)
Once you have measured the actual vehicle, you can compare lower offset, added width, or spacers on wheels you already own. The mistake to avoid is stacking changes on guesswork. Calculate the relative movement, measure the available space, and test the exact wheel-and-tire assembly before spending.