Tires Size 225/40R18
Dimensions, specs, and every size 225/40R18 tire currently in stock
25.08"
637 mm · calculated
225 mm
8.86 inches
3.54"
90 mm · 40% profile
18"
457.2 mm
Showing 31 to 40 of 121 products
225/40R18 Specifications
Read directly from the size code. Load index, speed rating, and rim width range vary by model.
| Specification | Imperial | Metric |
|---|---|---|
| Section width | 8.86 in | 225 mm |
| Aspect ratio | 40% | — |
| Sidewall height | 3.54 in | 90 mm |
| Overall diameter (calculated) | 25.08 in | 637 mm |
| Wheel / rim diameter | 18 in | 457.2 mm |
| Construction | Radial | — |
What does 225/40R18 mean?
Reading the code on your sidewall
225 mm
The distance from sidewall to sidewall across the tire's widest point.
40% profile
The sidewall stands 40% of the section width, which is 90 mm on this size.
Radial
The body plies run across the tire at right angles to the direction of travel.
18 in
Fits a wheel measuring 18 inches across.
225/40R18 Questions & Answers
Dimensions and fitment guidelines for size 225/40R18
Need Help Choosing The Right Tires?
Have questions about fitment, brands, or pricing? Our team of tire experts is here to guide you to the perfect set — zero pressure, zero sales tactics.
Talk to a Tire Specialist Today
We make tire buying fast and effortless. Call or email us (Mon – Sat, 9AM – 5PM PT) to check size compatibility, load index, or speed ratings for your vehicle.
Expert Advice
Reply within 1 business day
Shop Our Collection
Explore premium tires, wheels, and fitments from top brands
Gladiator Armor 4S All-weather EV Performance 235/65R18
Delinte DH2 A/S 215/70R15
Gripmax Maxgrip R/T 80PSI 37X13.50R24LT
Royalblack Terra Force A/T 275/65R18
Toyo Observe GSI-5 Winter 255/55R19
Roadtrack Terrena UHP 225/55ZR19
Gladiator Armor 4S All-weather EV Performance 235/65R18
Delinte DH2 A/S 215/70R15
Gripmax Maxgrip R/T 80PSI 37X13.50R24LT
Royalblack Terra Force A/T 275/65R18
Toyo Observe GSI-5 Winter 255/55R19
Roadtrack Terrena UHP 225/55ZR19