Home/275/40R20
Size reference
275/40R20: what fits & what to buy
Factory square on the narrow-body Hellcat, and the go-to rear for staggering a non-widebody Charger or Challenger.
275 = tread width in millimetres · 40 = sidewall height as a percentage of that width · R20 = radial construction on a 20-inch wheel. Two sizes with the same overall diameter are speedometer-compatible, that is the whole game in staggering.
What runs this size
Charger/Challenger SRT Hellcat 2015–2019 (factory, square), and the rear half of the 245/45R20 + 275/40R20 stagger on 20x10–10.5 wheels. Also common on staggered German setups. This size gets around.
Pairing this size front-to-rear? Run it through the stagger calculator before you order.
The picks
If the fronts are 4S, match the family out back. Balanced breakaway matters more on staggered cars, not less.
The family owners standardize on: driveable to the track, hooks at the track.
Wide, sticky enough, cheap enough to roast.
Always confirm against the tire placard on your driver-side door jamb and your actual wheel widths before ordering. Fitments here cover common factory and community setups. Years and packages vary.
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Good to know
Will a 275 fit my stock rear wheel? On the factory 9–9.5 inch Hellcat wheel, yes, that is its home. Pinched onto an 8-inch rim: no.
Wheel width window: 9–11 inches, happiest on 9.5–10. Upgrading a Hellcat? The usual move is a rear 305/35R20 on an 11-inch wheel, widebody clearance required.
// Sources & further reading
- 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.
- Michelin tire size listings & product data sheets · Manufacturer-published sizes and approved rim widths per tire model.
- 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.
How we compile and verify fitment data: our methodology. Spot an error? fitment@staggeredsetup.com. Corrections ship fast.