245/40R21 front · 275/35R21 rear

✓ Good pairing

Front diameter28.72″

Rear diameter28.58″

Difference-0.48%

Speedo at a true 7070.3 mph

Diameters are within 1%: speedometer, ABS, and stability control stay honest. This stagger is mechanically sound — now it is a wheel-width question. Rim widths and load index still decide the install — confirm both against the tire maker’s data sheet and your door-jamb placard.

Run your own numbers →
Want tires that rotate? The square fix →
Factory fitments by vehicle →