What is the diameter of a 315/35R21 tire?

A 315/35R21 tire has an overall diameter of 29.68 inches (753.9mm).

How many revolutions per mile does a 315/35R21 tire make?

A 315/35R21 tire makes approximately 679 revolutions per mile.

What rim width is recommended for 315/35R21 tires?

The recommended wheel rim width for a 315/35R21 tire is 7.9" - 11".

315/35R21

Standard Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The 315/35R21 tire size features an overall diameter of 29.68 inches, a section width of 12.4 inches (315mm), and rotates 679 times per mile. It is a standard factory tire fitment on 70+ vehicle models including BMW X5 M, BMW X6 M.

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Physical Dimensions & Specs

Overall Diameter

29.68"

753.9 mm

Section Width

315 mm

12.40" wide

Sidewall Height

4.34"

110.2 mm (35% aspect)

Revolutions / Mile

679

Circumference: 93.25"

Rim Diameter

21"

Wheel size

Recommended Rim Width

7.9" - 11"

Optimal rim width range

Speedometer & Alternate Size Calculator

Testing an alternate size for your vehicle? Compare 315/35R21 against any proposed tire size below:

Popular Comparisons:

Tire 1 (Stock / Base)315/35R21

Section Width (mm)

Aspect Ratio (%)

Rim Diameter (in)

Wheel Width (in)

Offset ET (mm)

Overall Height:29.7"

Sidewall:4.3"

Revs/Mile:679

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

-0.4%At 60 mph reading, actual speed is 59.8 mph

Indicated	Actual Speed	Diff
20 mph	19.9 mph	-0.1 mph
30 mph	29.9 mph	-0.1 mph
45 mph	44.8 mph	-0.2 mph
60 mph	59.8 mph	-0.2 mph
75 mph	74.7 mph	-0.3 mph
90 mph	89.7 mph	-0.3 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:-0.05" lower ground clearance

Vehicles That Fit 315/35R21 (70+ Models)

Factory standard and optional vehicle fitments utilizing 315/35R21 tires:

Year	Make & Model	Trim / Variant	Lookup Specs
2020	BMW X5 M	Base	View 2020 X5 M ›
2020	BMW X6 M	Base	View 2020 X6 M ›
2021	BMW X5 M	Base	View 2021 X5 M ›
2021	BMW X6 M	Base	View 2021 X6 M ›
2022	BMW X5 M	Base	View 2022 X5 M ›
2022	BMW X6 M	X6 M	View 2022 X6 M ›
2023	BMW X5 M	Base	View 2023 X5 M ›
2023	BMW X6 M	X6 M	View 2023 X6 M ›
2024	BMW X5 M	X5 M	View 2024 X5 M ›
2024	BMW X6 M	X6 M	View 2024 X6 M ›
2025	BMW X5 M	X5 M	View 2025 X5 M ›
2025	BMW X6 M	X6 M	View 2025 X6 M ›
2019	Porsche Cayenne	Base	View 2019 Cayenne ›
2019	Porsche Cayenne	S	View 2019 Cayenne ›
2019	Porsche Cayenne	Turbo	View 2019 Cayenne ›
2019	Porsche Cayenne	E-Hybrid	View 2019 Cayenne ›
2020	Porsche Cayenne	Base, 4D Utility Wagon	View 2020 Cayenne ›
2020	Porsche Cayenne	Base, 4D Utility Coupe	View 2020 Cayenne ›
2020	Porsche Cayenne	E-Hybrid, 4D Utility Wagon	View 2020 Cayenne ›
2020	Porsche Cayenne	E-Hybrid, 4D Utility Coupe	View 2020 Cayenne ›
2020	Porsche Cayenne	S, 4D Utility Coupe	View 2020 Cayenne ›
2020	Porsche Cayenne	S, 4D Utility Wagon	View 2020 Cayenne ›
2020	Porsche Cayenne	Turbo, 4D Utility Coupe	View 2020 Cayenne ›
2020	Porsche Cayenne	Turbo, 4D Utility Wagon	View 2020 Cayenne ›
2020	Porsche Cayenne	Turbo S E-Hybrid, 4D Utility Wagon	View 2020 Cayenne ›
2020	Porsche Cayenne	Turbo S E-Hybrid, 4D Utility Coupe	View 2020 Cayenne ›
2021	Porsche Cayenne	Base, 4D Utility Coupe	View 2021 Cayenne ›
2021	Porsche Cayenne	Base, 4D Utility Wagon	View 2021 Cayenne ›
2021	Porsche Cayenne	E-Hybrid, 4D Utility Coupe	View 2021 Cayenne ›
2021	Porsche Cayenne	E-Hybrid, 4D Utility Wagon	View 2021 Cayenne ›
2021	Porsche Cayenne	GTS, 4D Utility Coupe	View 2021 Cayenne ›
2021	Porsche Cayenne	GTS, 4D Utility Wagon	View 2021 Cayenne ›
2021	Porsche Cayenne	S, 4D Utility Wagon	View 2021 Cayenne ›
2021	Porsche Cayenne	Turbo S E-Hybrid, 4D Utility Coupe	View 2021 Cayenne ›
2021	Porsche Cayenne	Turbo S E-Hybrid, 4D Utility Wagon	View 2021 Cayenne ›
2021	Porsche Cayenne	Turbo, 4D Utility Coupe	View 2021 Cayenne ›
2021	Porsche Cayenne	Turbo, 4D Utility Wagon	View 2021 Cayenne ›
2021	Porsche Cayenne	S, 4D Utility Coupe	View 2021 Cayenne ›
2022	Porsche Cayenne	Base, 4D Utility Coupe	View 2022 Cayenne ›
2022	Porsche Cayenne	Base, 4D Utility Wagon	View 2022 Cayenne ›
2022	Porsche Cayenne	E-Hybrid, 4D Utility Coupe	View 2022 Cayenne ›
2022	Porsche Cayenne	E-Hybrid, 4D Utility Wagon	View 2022 Cayenne ›
2022	Porsche Cayenne	GTS, 4D Utility Coupe	View 2022 Cayenne ›
2022	Porsche Cayenne	GTS, 4D Utility Wagon	View 2022 Cayenne ›
2022	Porsche Cayenne	Platinum Edition, 4D Utility Coupe	View 2022 Cayenne ›
2022	Porsche Cayenne	Platinum Edition, 4D Utility Wagon	View 2022 Cayenne ›
2022	Porsche Cayenne	S, 4D Utility Coupe	View 2022 Cayenne ›
2022	Porsche Cayenne	S, 4D Utility Wagon	View 2022 Cayenne ›
2022	Porsche Cayenne	Turbo S E-Hybrid, 4D Utility Coupe	View 2022 Cayenne ›
2022	Porsche Cayenne	Turbo S E-Hybrid, 4D Utility Wagon	View 2022 Cayenne ›
2022	Porsche Cayenne	Turbo, 4D Utility Coupe	View 2022 Cayenne ›
2022	Porsche Cayenne	Turbo, 4D Utility Wagon	View 2022 Cayenne ›
2023	Porsche Cayenne	Base, 4D Utility Coupe	View 2023 Cayenne ›
2023	Porsche Cayenne	Base, 4D Utility Wagon	View 2023 Cayenne ›
2023	Porsche Cayenne	E-Hybrid Platinum Edition, 4D Utility Coupe	View 2023 Cayenne ›
2023	Porsche Cayenne	E-Hybrid Platinum Edition, 4D Utility Wagon	View 2023 Cayenne ›
2023	Porsche Cayenne	E-Hybrid, 4D Utility Coupe	View 2023 Cayenne ›
2023	Porsche Cayenne	E-Hybrid, 4D Utility Wagon	View 2023 Cayenne ›
2023	Porsche Cayenne	GTS, 4D Utility Coupe	View 2023 Cayenne ›
2023	Porsche Cayenne	Platinum Edition, 4D Utility Coupe	View 2023 Cayenne ›
2023	Porsche Cayenne	Platinum Edition, 4D Utility Wagon	View 2023 Cayenne ›
2023	Porsche Cayenne	S Platinum Edition, 4D Utility Coupe	View 2023 Cayenne ›
2023	Porsche Cayenne	GTS, 4D Utility Wagon	View 2023 Cayenne ›
2023	Porsche Cayenne	S Platinum Edition, 4D Utility Wagon	View 2023 Cayenne ›
2023	Porsche Cayenne	S, 4D Utility Coupe	View 2023 Cayenne ›
2023	Porsche Cayenne	S, 4D Utility Wagon	View 2023 Cayenne ›
2023	Porsche Cayenne	Turbo S E-Hybrid, 4D Utility Coupe	View 2023 Cayenne ›
2023	Porsche Cayenne	Turbo S E-Hybrid, 4D Utility Wagon	View 2023 Cayenne ›
2023	Porsche Cayenne	Turbo, 4D Utility Coupe	View 2023 Cayenne ›
2023	Porsche Cayenne	Turbo, 4D Utility Wagon	View 2023 Cayenne ›