Home/Staggered guide
The master guide
Staggered fitment, explained properly
Wider tires on the back than the front. That is the whole definition. The interesting parts are when it helps, what it costs, and the two rules that separate a sorted setup from an expensive mistake.
Square: same size at all four corners, the way every factory Charger ships, Hellcats included. Rotation stays possible; behavior stays neutral.
Rule 01
Match the diameters: the 1% rule
Your speedometer, ABS, traction and stability control all assume the four tires roll the same distance per revolution. Keep front and rear overall diameters within about 1% and everything stays honest. Drift past 2% and the speedo reads wrong, and stability control starts making decisions on bad data.
This is exactly why the classic pairs are what they are: as the tire gets wider, the aspect ratio drops to keep the diameter constant. 245/45R20 pairs with 275/40R20, not 275/45R20. Check any pairing:
// Stagger check: will these two sizes play nice?
The calculator also lives at its own address for bookmarking and sharing: staggeredsetup.com/staggered-tire-calculator/.
Rule 02
The wheel decides, not the tire
A wider tire only grips more if the wheel spreads it properly. Pinch a 275 onto an 8-inch rim and the tread crowns in the middle: less rubber on the road than the narrower tire you replaced. Before any stagger, check your wheels against the windows:
| Tire size | Rim width range | Happiest on | Common role |
|---|---|---|---|
| 235/55R18 | 6.5–8.5″ | 7.5″ | Factory SXT / R/T |
| 245/45R20 | 7.5–9.5″ | 8–8.5″ | Scat Pack square · stagger front |
| 275/40R20 | 9–11″ | 9.5–10″ | Hellcat square · stagger rear |
| 305/35R20 | 10–12″ | 11″ | Widebody square · big rear |
The trade-offs, honestly
What staggering costs you
Rotation is over
Fronts stay front, rears stay rear. On a driven Mopar the rears die young and alone. Budget for rears at roughly twice the front’s pace.
Balance shifts
When the rear out-grips the front, understeer creeps in at the limit. Fine for straight-line heroes; road-course drivers often prefer square for exactly this reason.
Two sizes forever
Two different replacement schedules, two prices, and no swapping a good rear to the front in a pinch. The look and the launch pay for it, just know the bill.
Why factory monsters ship square: even Hellcats leave the factory with matching sizes. It keeps rotation possible, inventory simple, and handling neutral. Staggering is a choice, not an upgrade path everyone must climb, and on factory-width wheels, a stickier compound beats a wider size every time. That is not a compromise; it is the physics of contact patches.
Ready for specifics? The Charger chart · Scat Pack picks · sizes: 245/45R20 · 275/40R20 · 305/35R20.
// Sources & further reading
- Continental tire knowledge: rim/tire combinations (ETRTO) · How approved rim-width ranges are defined under industry standards.
- Tire and Rim Association (T&RA) standards · The US standards body whose yearbook defines size/rim pairing norms.
- NHTSA: tire safety & ratings · Federal guidance on tire safety, aging, and UTQG ratings.
- Your vehicle’s tire placard (driver-side door jamb) & owner’s manual · The legally required OEM fitment record on every car, always the first authority.
How we compile and verify fitment data: our methodology. Spot an error? fitment@staggeredsetup.com. Corrections ship fast.