What is the diameter of a 295/30R21 tire?

A 295/30R21 tire has an overall diameter of 27.97 inches (710.4mm).

How many revolutions per mile does a 295/30R21 tire make?

A 295/30R21 tire makes approximately 721 revolutions per mile.

What rim width is recommended for 295/30R21 tires?

The recommended wheel rim width for a 295/30R21 tire is 7.4" - 10.3".

295/30R21

Standard Metric

Factory Specs, Physical Dimensions & Compatible Vehicle Applications

Factory Spec Overview

The 295/30R21 tire size features an overall diameter of 27.97 inches, a section width of 11.6 inches (295mm), and rotates 721 times per mile. It is a standard factory tire fitment on 11+ vehicle models including BMW 750i xDrive, BMW Alpina B7 xDrive.

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Physical Dimensions & Specs

Overall Diameter

27.97"

710.4 mm

Section Width

295 mm

11.61" wide

Sidewall Height

3.48"

88.4 mm (30% aspect)

Revolutions / Mile

721

Circumference: 87.87"

Rim Diameter

21"

Wheel size

Recommended Rim Width

7.4" - 10.3"

Optimal rim width range

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Speedometer & Alternate Size Calculator

Testing an alternate size for your vehicle? Compare 295/30R21 against any proposed tire size below:

Popular Comparisons:

Tire 1 (Stock / Base)295/30R21

Section Width (mm)

Aspect Ratio (%)

Rim Diameter (in)

Wheel Width (in)

Offset ET (mm)

Overall Height:28.0"

Sidewall:3.5"

Revs/Mile:721

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

+5.7%At 60 mph reading, actual speed is 63.4 mph

Indicated	Actual Speed	Diff
20 mph	21.1 mph	+1.1 mph
30 mph	31.7 mph	+1.7 mph
45 mph	47.6 mph	+2.6 mph
60 mph	63.4 mph	+3.4 mph
75 mph	79.3 mph	+4.3 mph
90 mph	95.2 mph	+5.2 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:+0.80" ground clearance

Vehicles That Fit 295/30R21 (11+ Models)

Factory standard and optional vehicle fitments utilizing 295/30R21 tires:

Year	Make & Model	Trim / Variant	Lookup Specs
2017	BMW 750i xDrive	750i xDrive	View 2017 750i xDrive ›
2017	BMW Alpina B7 xDrive	Alpina B7 xDrive	View 2017 Alpina B7 xDrive ›
2018	BMW 750i xDrive	750i xDrive	View 2018 750i xDrive ›
2018	BMW Alpina B7 xDrive	Alpina B7 xDrive	View 2018 Alpina B7 xDrive ›
2019	BMW 750i xDrive	750i xDrive	View 2019 750i xDrive ›
2019	BMW Alpina B7 xDrive	Alpina B7 xDrive	View 2019 Alpina B7 xDrive ›
2020	BMW Alpina B7 xDrive	Alpina B7 xDrive	View 2020 Alpina B7 xDrive ›
2021	BMW Alpina B7 xDrive	Alpina B7 xDrive	View 2021 Alpina B7 xDrive ›
2022	BMW Alpina B7 xDrive	Alpina B7 xDrive	View 2022 Alpina B7 xDrive ›
2024	Mercedes-Benz GT 63 AMG	2D Coupe	View 2024 GT 63 AMG ›
2024	Mercedes-Benz GT 63 AMG	4D Coupe	View 2024 GT 63 AMG ›