What is the diameter of a P215/50R18 tire?

A P215/50R18 tire has an overall diameter of 26.46 inches (672.1mm).

How many revolutions per mile does a P215/50R18 tire make?

A P215/50R18 tire makes approximately 762 revolutions per mile.

What rim width is recommended for P215/50R18 tires?

The recommended wheel rim width for a P215/50R18 tire is 5.4" - 7.5".

P215/50R18

Passenger / P-Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The P215/50R18 tire size features an overall diameter of 26.46 inches, a section width of 8.5 inches (215mm), and rotates 762 times per mile. It is a standard factory tire fitment on 14+ vehicle models including Mazda CX-3.

Shop P215/50R18 Tires on Tire Rack →Buy on Amazon →

Physical Dimensions & Specs

Overall Diameter

26.46"

672.1 mm

Section Width

215 mm

8.46" wide

Sidewall Height

4.23"

107.4 mm (50% aspect)

Revolutions / Mile

762

Circumference: 83.14"

Rim Diameter

18"

Wheel size

Recommended Rim Width

5.4" - 7.5"

Optimal rim width range

Where to Buy & Install P215/50R18 Tires

Looking for P215/50R18 tires? Skip hauling tires in your car—choose direct delivery to a local certified shop or doorstep delivery:

⭐ Recommended · Ship to Local Shop

Tire Rack

Free shipping directly to over 10,000+ certified local installers.

✓Delivered to local installer (Firestone, Discount Tire & local shops)
✓Mobile installation available — mount & balance right in your driveway
✓Free 2-year road hazard warranty on most eligible tire models

🏎️Find P215/50R18 on Tire Rack (Local Install) →

Direct Home Delivery

Amazon Automotive

Fast doorstep shipping for DIYers or bringing to your own shop.

✓Prime doorstep shipping for home garages or spares
✓Huge range of budget and specialty tire sizes in stock
✓Ideal if you have a local independent mechanic you prefer

🛒Shop P215/50R18 on Amazon →

As an affiliate for Tire Rack and Amazon, we earn from qualifying purchases at no extra cost to you.

Speedometer & Alternate Size Calculator

Testing an alternate size for your vehicle? Compare P215/50R18 against any proposed tire size below:

Popular Comparisons:

Tire 1 (Stock / Base)215/50R18

Section Width (mm)

Aspect Ratio (%)

Rim Diameter (in)

Wheel Width (in)

Offset ET (mm)

Overall Height:26.5"

Sidewall:4.2"

Revs/Mile:762

Tire 2 (New / Compare)245/60R18

Section Width (mm)

Aspect Ratio (%)

Rim Diameter (in)

Wheel Width (in)

Offset ET (mm)

Overall Height:29.6"

Sidewall:5.8"

Revs/Mile:682

Visual Tire & Wheel Comparison

Speedometer Variance

+11.8%At 60 mph reading, actual speed is 67.1 mph

Indicated	Actual Speed	Diff
20 mph	22.4 mph	+2.4 mph
30 mph	33.5 mph	+3.5 mph
45 mph	50.3 mph	+5.3 mph
60 mph	67.1 mph	+7.1 mph
75 mph	83.8 mph	+8.8 mph
90 mph	100.6 mph	+10.6 mph

Fender & Suspension Clearance

Fitment Status: MODERATE RISK

Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.

Inner Strut Space:7.7mm LESS clearance

Outer Fender Push:Extends 17.7mm further out

Ride Height Delta:+1.56" ground clearance

Vehicles That Fit P215/50R18 (14+ Models)

Factory standard and optional vehicle fitments utilizing P215/50R18 tires:

Year	Make & Model	Trim / Variant	Lookup Specs
2016	Mazda CX-3	Grand Touring, AWD	View 2016 CX-3 ›
2016	Mazda CX-3	Grand Touring, FWD	View 2016 CX-3 ›
2017	Mazda CX-3	Grand Touring, AWD	View 2017 CX-3 ›
2017	Mazda CX-3	Touring, FWD	View 2017 CX-3 ›
2017	Mazda CX-3	Touring, AWD	View 2017 CX-3 ›
2017	Mazda CX-3	Grand Touring, FWD	View 2017 CX-3 ›
2018	Mazda CX-3	Touring, AWD	View 2018 CX-3 ›
2018	Mazda CX-3	Grand Touring, FWD	View 2018 CX-3 ›
2018	Mazda CX-3	Touring, FWD	View 2018 CX-3 ›
2018	Mazda CX-3	Grand Touring, AWD	View 2018 CX-3 ›
2019	Mazda CX-3	Grand Touring, AWD	View 2019 CX-3 ›
2019	Mazda CX-3	Touring, FWD	View 2019 CX-3 ›
2019	Mazda CX-3	Touring, AWD	View 2019 CX-3 ›
2019	Mazda CX-3	Grand Touring, FWD	View 2019 CX-3 ›