Is the size the diameter of the metal rim or the rubber tire?

Read the side wall of the tire for proper inner tube sizing. The first number is the diameter of your wheel, the second is the width.

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Description

🚴‍♂️ Ride Fat, Ride Fearless – Upgrade Your Fat Bike Game!

BUILT TO LAST - Thicker, wear-resistant tube with valve cover to prevent leaks and deformation.
ENHANCED RIDE COMFORT - Shock-absorbing tube design smooths out bumps for a plush ride experience.
SUPERIOR AIR RETENTION - Butyl rubber construction ensures airtight seal and long-lasting inflation.
UNIVERSAL FAT TIRE FIT - Fits 20" tires from 3.5" to 4.5" wide, perfect for fat bikes and e-bikes.
EFFORTLESS INSTALLATION - Comes with 2 tire levers to protect rims and fingers during tube changes.

Hydencamm’s 20x4 fat bike inner tubes feature premium butyl rubber and a 32mm Schrader valve, designed to fit tires between 3.5" and 4.5" wide. Each pack includes two tubes and tire levers for easy installation, delivering superior air retention, durability, and shock absorption—ideal for mountain, gravel, city, and electric fat bikes.

Specifications

Brand	Hydencamm
Valve Type	Schrader
Material	Butyl Rubber
Wheel Size	20 Inches
Item Diameter	20 Inches
Item Width	4 Inches
Compatible Tire Width Minimum	3.5 Inches
Valve Length	32 Millimeters
Item Weight	1.94 Pounds
Manufacturer	Hydencamm
Size	20 x3.5/4.5
Compatible Tire Width Maximum	4.5 Inches
Item Package Dimensions L x W x H	8.03 x 6.1 x 3.15 inches
Package Weight	0.91 Kilograms
Brand Name	Hydencamm
Warranty Description	6 Months
Model Name	20 Fat Tire Bike Inner Tubes
Color	Black
Suggested Users	unisex-teen
Number of Items	2
Part Number	20-Bike tube
Style	20" X 3.5/4.5 (2pack)
Included Components	2 Pack-20" Fat Tube, 2 Tire Levers
Sport Type	Cycling

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