Lowest price
Gripmax Suregrip Pro Sport
315/45R21
SummerPassenger
Price
$223.96
at SimpleTire4.6(8,900)
Excl. install
Price
$223.96
at SimpleTire
315/45R21Tires
2 prices · 2 brands · 1 retailers · Updated 1 month ago
Cheapest Price
$223.96
at SimpleTire (excl. installation)
Prices updated: July 6, 2026
2 of 2 offers for 315/45R21
Price comparison: 315/45R21
Showing 2 of 2 tires
Continental Premiumcontact 6
315/45R21
Load116 · 2,756 lbsSpeedY · 186 mph
SummerPassenger
Price
$482.99
at SimpleTire4.6(8,900)
Excl. install
Price
$482.99
at SimpleTire
Prices per tire · Sales tax may apply · Updated 1 month ago · Submit a price correction
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What Does 315/45R21 Mean?
315
Width
millimetres
45
Profile
% of width
21
Rim
inches
A 315mm wide tire with a sidewall height equal to 45% of the width (141.8mm), fitting a 21-inch rim, a common passenger tire size in the US market.
FAQ: 315/45R21 Tires
Where can I buy 315/45R21 tires online in the USA?+
The cheapest 315/45R21 tires we track start at $223.96 from SimpleTire. Tire Rack, SimpleTire, Priority Tire, and other national retailers ship nationwide; use the table above to compare.
How much does a 315/45R21 tire cost in the USA?+
315/45R21 tires typically range from about $223.96 for value brands up to $492.71 or more for premium performance tires. Installation is usually $15–$25 per tire extra.
Is 315/45R21 the right tire for my car?+
Check your door-jamb sticker or owner's manual. Many vehicles that use 315/45R21 also have approved alternative sizes; see our vehicle fitment pages for common models.
How much does tire installation cost for 315/45R21?+
Most US tire shops charge $15–$25 per tire for mount and balance. Wheel alignment is often $75–$150 extra. Retailers like Tire Rack let you ship to a local installer at checkout.
Is 315/45R21 the same as 315/45R21?+
Yes, same size. Both describe a 315mm wide tire with a 45% sidewall on a 21-inch rim.
Related Tire Sizes
Looking for a specific brand? Gripmax, Continental. City hubs: Houston, Los Angeles, Chicago, New York. Seasons: all-season, winter.