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Fitment Guides

WHEEL & TIRE
FITMENT GUIDES

Practical, spec-heavy guides from the Fitment Labs desk. Learn how offset, backspacing, tire sizing, staggered setups, and lift kits actually work — then use our offset calculator to run your numbers.

◆ Fitment 101

Wheel Offset Explained: Positive vs Negative Offset and What It Means for Your Fitment

The complete guide to positive, negative, and zero offset — what the ET number really means, how it changes poke and clearance, and how to pick the right spec.

8 min read · Updated 2026-07-06
◆ Tires

How to Read Tire Sizes: What the Numbers on Your Sidewall Mean

Section width, aspect ratio, load index, speed rating — everything stamped on your sidewall, decoded with real examples and swap-friendly rules.

7 min read · Updated 2026-07-06
◆ Fitment 101

Staggered Fitment: Pros, Cons, and When to Run Wider Rear Wheels

Staggered setups run wider rears than fronts. Here's when it works, when it hurts, and how to spec a staggered wheel-and-tire package.

9 min read · Updated 2026-07-06
◆ Off-Road

Lift Kit Wheel Fitment: Choosing Wheels and Tires After You Lift Your Truck

How much lift for 33s, 35s, and 37s — plus the offset, backspacing, and tire specs that actually work on modern half-tons, Broncos, and Wranglers.

10 min read · Updated 2026-07-06
◆ Also Worth Reading

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