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.