What does 27.5" (650B) Bike mean?

It specifies a 55 mm section width and a 23.0-inch bead-seat diameter.

What is the overall diameter of the 27.5" (650B) Bike Tire?

Its overall diameter is about 700.0 mm, with a circumference of 2199.1 mm.

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27.5" (650B) Bike Tire Size & Dimensions

Tires

Official Confirmed Size

The 27.5" (650B) Bike Tire has a section width of 55.0 mm ( 2.17 in), a 58.0 mm sidewall, and an overall diameter of 700.0 mm ( 27.56 in). It rolls 2199.1 mm per revolution. It weighs 800 g (1.76 lb).

Exact Dimensions

27.5" (650B) Bike Tire exact dimensions in millimeters and inches
Dimension	Metric	Imperial
Section width	55.0 mm	2.17 in
Sidewall height	58.0 mm	2.28 in
Overall diameter	700.0 mm	27.56 in
Rim diameter	584.0 mm	22.99 in
Circumference	2199.1 mm	86.58 in
Revolutions per mile	731.8	731.8
Weight	800 g	1.76 lb

Calculate another tire sizeCompare diameter, circumference, clearance change, and speedometer impact for a replacement tire.

Size in Context

The 27.5" (650B) Bike Tire has a section width of 55.0 mm, a sidewall height of 58.0 mm, and an overall diameter of 700.0 mm. Each revolution covers about 2199.1 mm. It weighs about 800 g.

The 27.5" (650B) Bike Tire is a vehicle component, so its outer diameter, width, and profile describe the space it needs rather than a pocket or desk footprint.

At 800 g, the 27.5" (650B) Bike Tire has the substantial feel expected of a vehicle component; size and weight both matter for fit and handling.