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Cooper
Discoverer Crossrange
275/45R21
$246.74/tire
$328.99
Set of 4: $986.96
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↩️ Free returns within 30 days — unmounted tires, prepaid label, no return shipping cost.
Specifications
| Size | 275/45R21 Discoverer Crossrange |
|---|---|
| Width | 275 mm |
| Aspect ratio | 45 |
| Rim diameter | R21 |
| Load index | 107 |
| Speed rating | H |
| Load range | SL |
| UTQG | 400 A A |
|---|---|
| Tread depth | 11/32" |
| Weight | 33.52 lbs |
| Max pressure | 51 psi |
| Severe snow (3PMSF) | No |
| Run-flat | No |
About the Cooper Discoverer Crossrange
All-Season Sports Performance Highway Terrain Passenger SUV and CUV tire.
Understanding the 275/45R21 size
In the size code 275/45R21, 275 is the section width in millimetres (about 10.8"). 45 is the aspect ratio — the sidewall height is 45% of the width, or roughly 123.8 mm. R21 means radial construction on a 21-inch wheel, giving an approximate overall diameter of 30.7".
The load index 107 means each tire supports up to 2,149 lbs — about 8,596 lbs across a full set of four. The speed symbol H certifies the tire to 130 mph under its rated load. Always match or exceed the load index and speed rating listed on your vehicle's door-jamb placard.
What the Cooper Discoverer Crossrange is built for
Fitment category: Undefined.
Tread life and grip ratings
This tire carries a UTQG rating of 400 A A. The treadwear grade of 400 is a relative durability score — a grade of 200 is expected to last roughly twice as long as a grade of 100 under the same controlled test. Traction grade A measures straight-line wet stopping grip (AA is highest, then A, B and C). Temperature grade A reflects heat resistance at sustained speed (A is highest).
Price and value
At $246.74 per tire, a full set of four costs $986.96. That is about 21% below the average price of the 73 tires we stock in this size.
Frequently asked questions
What does the tire size 275/45R21 mean?
275 is the section width in millimetres, 45 is the aspect ratio (sidewall height as a percentage of width, about 123.8 mm), and R21 indicates radial construction for a 21-inch wheel. Overall diameter is approximately 30.7 inches.
What are the load and speed ratings of the Cooper Discoverer Crossrange 275/45R21?
Its load index of 107 allows up to 2,149 lbs per tire. Its speed rating of H is certified to 130 mph. Check your door-jamb placard and do not fit a tire rated below the vehicle's requirement.
How much does a set of 4 Cooper Discoverer Crossrange 275/45R21 tires cost?
A single tire is $246.74 and a set of four is $986.96.
Does the Discoverer Crossrange come in other sizes?
Yes — we stock 1 additional Discoverer Crossrange size besides 275/45R21. Fit only a size approved for your vehicle.
Other sizes of this model
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