What is the diameter of a 275/45R21 tire?

A 275/45R21 tire has an overall diameter of 30.74 inches (780.8mm).

How many revolutions per mile does a 275/45R21 tire make?

A 275/45R21 tire makes approximately 656 revolutions per mile.

What rim width is recommended for 275/45R21 tires?

The recommended wheel rim width for a 275/45R21 tire is 6.9" - 9.6".

275/45R21

Standard Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The 275/45R21 tire size features an overall diameter of 30.74 inches, a section width of 10.8 inches (275mm), and rotates 656 times per mile. It is a standard factory tire fitment on 150+ vehicle models including Chevrolet Blazer EV.

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Physical Dimensions & Specs

Overall Diameter

30.74"

780.8 mm

Section Width

275 mm

10.83" wide

Sidewall Height

4.87"

123.7 mm (45% aspect)

Revolutions / Mile

656

Circumference: 96.59"

Rim Diameter

21"

Wheel size

Recommended Rim Width

6.9" - 9.6"

Optimal rim width range

Speedometer & Alternate Size Calculator

Testing an alternate size for your vehicle? Compare 275/45R21 against any proposed tire size below:

Popular Comparisons:

Tire 1 (Stock / Base)275/45R21

Section Width (mm)

Aspect Ratio (%)

Rim Diameter (in)

Wheel Width (in)

Offset ET (mm)

Overall Height:30.7"

Sidewall:4.9"

Revs/Mile:656

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

-3.8%At 60 mph reading, actual speed is 57.7 mph

Indicated	Actual Speed	Diff
20 mph	19.2 mph	-0.8 mph
30 mph	28.9 mph	-1.1 mph
45 mph	43.3 mph	-1.7 mph
60 mph	57.7 mph	-2.3 mph
75 mph	72.1 mph	-2.9 mph
90 mph	86.6 mph	-3.4 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:-0.58" lower ground clearance

Vehicles That Fit 275/45R21 (150+ Models)

Factory standard and optional vehicle fitments utilizing 275/45R21 tires:

Year	Make & Model	Trim / Variant	Lookup Specs
2024	Chevrolet Blazer EV	RS, AWD	View 2024 Blazer EV ›
2024	Chevrolet Blazer EV	RS, RWD	View 2024 Blazer EV ›
2025	Chevrolet Blazer EV	RS, AWD	View 2025 Blazer EV ›
2025	Chevrolet Blazer EV	RS, RWD	View 2025 Blazer EV ›
2021	Ford Explorer	Platinum Hybrid, 4WD	View 2021 Explorer ›
2021	Ford Explorer	Platinum Hybrid, RWD	View 2021 Explorer ›
2021	Ford Explorer	Platinum, 4WD	View 2021 Explorer ›
2021	Ford Explorer	Platinum, RWD	View 2021 Explorer ›
2022	Ford Explorer	Platinum, 4WD	View 2022 Explorer ›
2022	Ford Explorer	Platinum Hybrid, 4WD	View 2022 Explorer ›
2022	Ford Explorer	Platinum, RWD	View 2022 Explorer ›
2022	Ford Explorer	Platinum Hybrid, RWD	View 2022 Explorer ›
2023	Ford Explorer	Platinum, 4WD	View 2023 Explorer ›
2023	Ford Explorer	Platinum Hybrid, 4WD	View 2023 Explorer ›
2023	Ford Explorer	Platinum Hybrid, RWD	View 2023 Explorer ›
2023	Ford Explorer	Platinum, RWD	View 2023 Explorer ›
2024	Ford Explorer	Platinum, 4WD	View 2024 Explorer ›
2024	Ford Explorer	Platinum, RWD	View 2024 Explorer ›
2024	Ford Explorer	ST, 4WD	View 2024 Explorer ›
2024	Ford Explorer	ST, RWD	View 2024 Explorer ›
2025	Ford Explorer	Platinum, 2.3L Eng VIN H, 4WD	View 2025 Explorer ›
2025	Ford Explorer	Platinum, 2.3L Eng VIN H, RWD	View 2025 Explorer ›
2025	Ford Explorer	Platinum, 3.0L Eng VIN C, 4WD	View 2025 Explorer ›
2025	Ford Explorer	Platinum, 3.0L Eng VIN C, RWD	View 2025 Explorer ›
2025	Ford Explorer	ST, 4WD	View 2025 Explorer ›
2025	Ford Explorer	ST, RWD	View 2025 Explorer ›
2025	Ford Explorer	ST-Line, 4WD	View 2025 Explorer ›
2025	Ford Explorer	ST-Line, RWD	View 2025 Explorer ›
2024	Honda Prologue	Elite	View 2024 Prologue ›
2025	Honda Prologue	Elite	View 2025 Prologue ›
2021	Jeep Grand Cherokee L	Summit Reserve, 3.6L Eng VIN G	View 2021 Grand Cherokee L ›
2022	Jeep Grand Cherokee	Summit Reserve, 5.7L Eng VIN T	View 2022 Grand Cherokee ›
2022	Jeep Grand Cherokee	Summit Reserve 4xe	View 2022 Grand Cherokee ›
2022	Jeep Grand Cherokee	Summit Reserve, 3.6L Eng VIN G	View 2022 Grand Cherokee ›
2022	Jeep Grand Cherokee L	Summit Reserve, 3.6L Eng VIN G	View 2022 Grand Cherokee L ›
2022	Jeep Grand Cherokee L	Summit Reserve, 5.7L Eng VIN T	View 2022 Grand Cherokee L ›
2023	Jeep Grand Cherokee	Summit Reserve, 3.6L Eng VIN G	View 2023 Grand Cherokee ›
2023	Jeep Grand Cherokee	Summit Reserve, 5.7L Eng VIN T	View 2023 Grand Cherokee ›
2023	Jeep Grand Cherokee	Summit Reserve 4xe	View 2023 Grand Cherokee ›
2023	Jeep Grand Cherokee L	Summit Reserve, 3.6L Eng VIN G	View 2023 Grand Cherokee L ›
2023	Jeep Grand Cherokee L	Summit Reserve, 5.7L Eng VIN T	View 2023 Grand Cherokee L ›
2024	Jeep Grand Cherokee	Summit Reserve 4xe	View 2024 Grand Cherokee ›
2024	Jeep Grand Cherokee	Summit Reserve	View 2024 Grand Cherokee ›
2024	Jeep Grand Cherokee L	Summit Reserve, 5.7L Eng VIN T	View 2024 Grand Cherokee L ›
2024	Jeep Grand Cherokee L	Summit, 3.6L Eng VIN G	View 2024 Grand Cherokee L ›
2024	Jeep Grand Cherokee L	Summit, 5.7L Eng VIN T	View 2024 Grand Cherokee L ›
2024	Jeep Grand Cherokee L	Summit Reserve, 3.6L Eng VIN G	View 2024 Grand Cherokee L ›
2025	Jeep Grand Cherokee	Summit Reserve	View 2025 Grand Cherokee ›
2025	Jeep Grand Cherokee	Summit Reserve 4xe	View 2025 Grand Cherokee ›
2025	Jeep Grand Cherokee	Summit 4xe	View 2025 Grand Cherokee ›
2025	Jeep Grand Cherokee	Summit	View 2025 Grand Cherokee ›
2025	Jeep Grand Cherokee L	Summit Reserve	View 2025 Grand Cherokee L ›
2025	Jeep Grand Cherokee L	Summit	View 2025 Grand Cherokee L ›
2013	Land Rover Range Rover	Autobiography	View 2013 Range Rover ›
2013	Land Rover Range Rover	Supercharged	View 2013 Range Rover ›
2014	Land Rover Range Rover Sport	Autobiography	View 2014 Range Rover Sport ›
2014	Land Rover Range Rover	Supercharged	View 2014 Range Rover ›
2014	Land Rover Range Rover	Autobiography Black	View 2014 Range Rover ›
2014	Land Rover Range Rover	Autobiography	View 2014 Range Rover ›
2015	Land Rover Range Rover	Supercharged	View 2015 Range Rover ›
2015	Land Rover Range Rover	Autobiography	View 2015 Range Rover ›
2015	Land Rover Range Rover Sport	SVR	View 2015 Range Rover Sport ›
2015	Land Rover Range Rover Sport	Autobiography	View 2015 Range Rover Sport ›
2016	Land Rover Range Rover	Supercharged	View 2016 Range Rover ›
2016	Land Rover Range Rover	SVAutobiography	View 2016 Range Rover ›
2016	Land Rover Range Rover Sport	Autobiography	View 2016 Range Rover Sport ›
2016	Land Rover Range Rover Sport	HST, 3.0L Eng VIN P	View 2016 Range Rover Sport ›
2016	Land Rover Range Rover	Autobiography	View 2016 Range Rover ›
2016	Land Rover Range Rover Sport	HST, 3.0L Eng VIN V	View 2016 Range Rover Sport ›
2016	Land Rover Range Rover Sport	SVR	View 2016 Range Rover Sport ›
2017	Land Rover Discovery	First Edition, 3.0L Eng VIN K	View 2017 Discovery ›
2017	Land Rover Discovery	First Edition, 3.0L Eng VIN V	View 2017 Discovery ›
2017	Land Rover Range Rover	Autobiography	View 2017 Range Rover ›
2017	Land Rover Range Rover	Supercharged	View 2017 Range Rover ›
2017	Land Rover Range Rover Sport	HSE Dynamic	View 2017 Range Rover Sport ›
2017	Land Rover Range Rover Sport	SVR	View 2017 Range Rover Sport ›
2018	Land Rover Range Rover	Autobiography	View 2018 Range Rover ›
2018	Land Rover Range Rover Sport	Autobiography Dynamic	View 2018 Range Rover Sport ›
2018	Land Rover Range Rover Sport	HSE Dynamic	View 2018 Range Rover Sport ›
2018	Land Rover Range Rover	Supercharged	View 2018 Range Rover ›
2018	Land Rover Range Rover Sport	SVR	View 2018 Range Rover Sport ›
2018	Land Rover Range Rover Sport	Supercharged Dynamic	View 2018 Range Rover Sport ›
2019	Land Rover Range Rover	Autobiography	View 2019 Range Rover ›
2019	Land Rover Range Rover	Supercharged	View 2019 Range Rover ›
2019	Land Rover Range Rover Sport	Autobiography Dynamic	View 2019 Range Rover Sport ›
2019	Land Rover Range Rover Sport	HST	View 2019 Range Rover Sport ›
2019	Land Rover Range Rover Sport	SVR	View 2019 Range Rover Sport ›
2019	Land Rover Range Rover Sport	Supercharged Dynamic	View 2019 Range Rover Sport ›
2020	Land Rover Range Rover	Autobiography	View 2020 Range Rover ›
2020	Land Rover Range Rover Sport	Autobiography Dynamic, 2.0L Eng VIN Y	View 2020 Range Rover Sport ›
2020	Land Rover Range Rover Sport	Autobiography Dynamic, 5.0L Eng VIN E	View 2020 Range Rover Sport ›
2020	Land Rover Range Rover Sport	HSE Dynamic	View 2020 Range Rover Sport ›
2020	Land Rover Range Rover Sport	HST	View 2020 Range Rover Sport ›
2020	Land Rover Range Rover Sport	SVR	View 2020 Range Rover Sport ›
2021	Land Rover Range Rover	Autobiography, 2.0L Eng VIN Y	View 2021 Range Rover ›
2021	Land Rover Range Rover	Autobiography, 5.0L Eng VIN E	View 2021 Range Rover ›
2021	Land Rover Range Rover Sport	Autobiography Dynamic, 2.0L Eng VIN Y	View 2021 Range Rover Sport ›
2021	Land Rover Range Rover Sport	Autobiography Dynamic, 5.0L Eng VIN E	View 2021 Range Rover Sport ›
2021	Land Rover Range Rover Sport	HSE Dynamic	View 2021 Range Rover Sport ›
2021	Land Rover Range Rover Sport	HSE Silver Edition, 2.0L Eng VIN Y	View 2021 Range Rover Sport ›
2021	Land Rover Range Rover Sport	HSE Silver Edition, 3.0L Eng VIN K	View 2021 Range Rover Sport ›
2021	Land Rover Range Rover Sport	HSE Silver Edition, 3.0L Eng VIN U	View 2021 Range Rover Sport ›
2021	Land Rover Range Rover Sport	HST	View 2021 Range Rover Sport ›
2021	Land Rover Range Rover Sport	SVR	View 2021 Range Rover Sport ›
2022	Land Rover Range Rover	Autobiography, 4.4L Eng VIN 7	View 2022 Range Rover ›
2022	Land Rover Range Rover	Autobiography, 5.0L Eng VIN E	View 2022 Range Rover ›
2022	Land Rover Range Rover Sport	Autobiography Dynamic	View 2022 Range Rover Sport ›
2022	Land Rover Range Rover Sport	HSE Dynamic	View 2022 Range Rover Sport ›
2022	Land Rover Range Rover Sport	HSE Silver Edition	View 2022 Range Rover Sport ›
2022	Land Rover Range Rover Sport	HST	View 2022 Range Rover Sport ›
2022	Land Rover Range Rover Sport	SVR	View 2022 Range Rover Sport ›
2024	Land Rover Discovery	Dynamic SE, 3.0L Eng VIN U	View 2024 Discovery ›
2024	Land Rover Discovery	Dynamic SE, 2.0L Eng VIN X	View 2024 Discovery ›
2025	Land Rover Discovery	Dynamic SE, 3.0L Eng VIN U	View 2025 Discovery ›
2025	Land Rover Discovery	Dynamic SE, 2.0L Eng VIN X	View 2025 Discovery ›
2020	Lincoln Aviator	Black Label Grand Touring	View 2020 Aviator ›
2021	Lincoln Aviator	Black Label Grand Touring	View 2021 Aviator ›
2021	Lincoln Aviator	Grand Touring	View 2021 Aviator ›
2022	Lincoln Aviator	Black Label Grand Touring	View 2022 Aviator ›
2022	Lincoln Aviator	Grand Touring	View 2022 Aviator ›
2023	Lincoln Aviator	Black Label Grand Touring	View 2023 Aviator ›
2023	Lincoln Aviator	Grand Touring	View 2023 Aviator ›
2025	Lincoln Aviator	Premiere, AWD	View 2025 Aviator ›
2025	Lincoln Aviator	Premiere, RWD	View 2025 Aviator ›
2025	Lincoln Aviator	Reserve, RWD	View 2025 Aviator ›
2025	Lincoln Aviator	Reserve, AWD	View 2025 Aviator ›
2024	Mazda CX-90	PHEV Premium	View 2024 CX-90 ›
2024	Mazda CX-90	PHEV Premium Plus	View 2024 CX-90 ›
2024	Mazda CX-90	Turbo Premium	View 2024 CX-90 ›
2024	Mazda CX-90	Turbo Premium Plus	View 2024 CX-90 ›
2024	Mazda CX-90	Turbo S	View 2024 CX-90 ›
2024	Mazda CX-90	Turbo S Premium Plus	View 2024 CX-90 ›
2024	Mazda CX-90	Turbo S Premium	View 2024 CX-90 ›
2025	Mazda CX-70	PHEV Premium	View 2025 CX-70 ›
2025	Mazda CX-70	Turbo Preferred	View 2025 CX-70 ›
2025	Mazda CX-90	PHEV Premium Plus	View 2025 CX-90 ›
2025	Mazda CX-90	Turbo Premium Plus	View 2025 CX-90 ›
2025	Mazda CX-90	PHEV Premium Sport	View 2025 CX-90 ›
2025	Mazda CX-90	Turbo Premium Sport	View 2025 CX-90 ›
2025	Mazda CX-90	Turbo S Premium	View 2025 CX-90 ›
2025	Mazda CX-90	Turbo S Premium Plus	View 2025 CX-90 ›
2016	Mercedes-Benz GLE450 AMG	GLE450 AMG	View 2016 GLE450 AMG ›
2018	Mercedes-Benz GLE43 AMG	4D Utility	View 2018 GLE43 AMG ›
2018	Mercedes-Benz GLE43 AMG	4D Utility Coupe	View 2018 GLE43 AMG ›
2019	Mercedes-Benz GLE43 AMG	4D Utility	View 2019 GLE43 AMG ›
2019	Mercedes-Benz GLE43 AMG	4D Utility Coupe	View 2019 GLE43 AMG ›
2020	Mercedes-Benz GLS580	GLS580	View 2020 GLS580 ›
2021	Mercedes-Benz GLE63 S AMG	4D Utility	View 2021 GLE63 S AMG ›
2021	Mercedes-Benz GLE63 S AMG	4D Utility Coupe	View 2021 GLE63 S AMG ›
2021	Mercedes-Benz GLS580	GLS580	View 2021 GLS580 ›