Edit live — section height, diameter, circumference, and revs/mile recompute as you type.
Plus-sizing keeps overall diameter within ±3% so your speedometer, ABS, and traction control stay calibrated. Bumping rim diameter up by 1" usually means dropping aspect ratio by 5–10 points.
No alternates within ±3% diameter for that input. Try a more common size.
New tire is 2.22 in taller (+7.0% diameter). Speedometer reads 7.0% slow — at indicated 60 mph you're actually doing 64.2 mph.
3–7% — verify clearanceEstimated lift to clear: ~1.0 in · vehicle: 2024 Tacoma TRD
A 245/45R18 stands 26.68" tall, with a 4.34" sidewall. Compare against another size — switch to the Compare tab.
Reference values only. Manufacturer specifications override. Verify load index, speed rating, and physical clearance before driving — especially with upsizes greater than 3% diameter. Speedometer correction may require an OBD2 tuner. Tire-coverage rules vary by state.
Tire height & diameter calculator by RevRated · Reviewed by Mike Reeves, ASE Master Technician