What 315/40R18 means
315/40R18 identifies the tire dimensions used for fitment. Match this size exactly unless a qualified installer confirms an alternative.
Exact-size tire comparison
315/40R18 Tires: Compare Prices, Brands & Options
Only exact 315/40R18 tire matches appear in the main results. Confirm tire size, load rating, speed rating, and fitment on the retailer site before buying.
Size guide
Buying considerations
Compare category, load rating, speed rating, installation, shipping, current price, and whether the retailer fitment tool matches your vehicle.
Vehicles using this size
Brands available in this size
Tire categories available
Common alternatives
1Exact Size MatchVerified ProductPrice Available
Passenger and SUV tires
Nitto NT555RII LL Drag Racing Radials
315/40R18all-season
- Category
- Passenger and SUV tires
- Use case
- all-season
315/40R18 shoppers comparing Nitto NT555RII LL Drag Racing Radials through The Tire Rack product feed availability.
$503.00 at Tire RackConfirm size, load rating, speed rating, and fitment before purchase.245/40R18 tires235/40R18 tires245/45R18 tires225/40R18 tires235/45R18 tires255/55R18 tires265/60R18 tires275/65R18 tires
FAQ
What vehicles commonly use 315/40R18 tires?
315/40R18 can appear on multiple trims and vehicle types. Confirm the driver-side door placard or retailer fitment tool before buying.
What brands make 315/40R18 tires?
Common 315/40R18 brand paths include Nitto, Michelin, Goodyear, Bridgestone. Availability changes by retailer, model, load rating, and speed rating.
What tire categories are available in 315/40R18?
315/40R18 tire searches commonly include Best, Price, All-Season, All-Weather categories. Match the category to climate, vehicle use, mileage needs, and ride preference.
Can I replace 315/40R18 with 245/40R18?
Only use a different size if a qualified installer or retailer fitment tool confirms it. Diameter, load rating, speed rating, clearance, and vehicle systems can all be affected.
Are 315/40R18 tires expensive?
315/40R18 tire pricing depends on brand, category, warranty, speed rating, load rating, installation, shipping, and current retailer availability. Compare retailer checkout pages before deciding.
What should I check before buying 315/40R18 tires?
Confirm exact size, load rating, speed rating, tire category, installation availability, shipping, return policy, and whether the retailer fitment tool matches your vehicle.
Related tire research
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Reviewed by the Tire Search Engine editorial team. Updated June 3, 2026. Sources: retailer fitment tools, tire sidewall specifications, manufacturer information, and the Tire Search Engine methodology.