345/25R21
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
The 345/25R21 tire size features an overall diameter of 27.79 inches, a section width of 13.6 inches (345mm), and rotates 726 times per mile. It is a standard factory tire fitment on 11+ vehicle models including Chevrolet Corvette.
Physical Dimensions & Specs
Overall Diameter
27.79"
705.9 mmSection Width
345 mm
13.58" wideSidewall Height
3.4"
86.4 mm (25% aspect)Revolutions / Mile
726
Circumference: 87.31"Rim Diameter
21"
Wheel sizeRecommended Rim Width
8.6" - 12.1"
Optimal rim width rangeWhere to Buy & Install 345/25R21 Tires
Looking for 345/25R21 tires? Skip hauling tires in your car—choose direct delivery to a local certified shop or doorstep delivery:
Tire Rack
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Amazon Automotive
Fast doorstep shipping for DIYers or bringing to your own shop.
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Speedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 345/25R21 against any proposed tire size below:
Visual Tire & Wheel Comparison
Speedometer Variance
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 21.3 mph | +1.3 mph |
| 30 mph | 31.9 mph | +1.9 mph |
| 45 mph | 47.9 mph | +2.9 mph |
| 60 mph | 63.9 mph | +3.9 mph |
| 75 mph | 79.8 mph | +4.8 mph |
| 90 mph | 95.8 mph | +5.8 mph |
Fender & Suspension Clearance
Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.
Vehicles That Fit 345/25R21 (11+ Models)
Factory standard and optional vehicle fitments utilizing 345/25R21 tires: