Inner Tube FISCHER Dunlop Valve 20 inch (50.80 cm) compatible with ETRTO sizing

FISCHER inner tube with a Dunlop (Woods) valve in 20" (50.80 cm) size, manufactured to match common ETRTO sizing for small-wheeled bicycles. This replacement tube is intended for use where a 20" ETRTO inner tube is specified, offering a standard rubber construction that provides an airtight seal and reliable pressure retention. The Dunlop valve design allows for easy inflation using pumps compatible with Woods/Dunlop valves and is commonly found on city, folding and certain children's bikes.

Advantages

The tube is designed to provide a consistent fit for 20" ETRTO tire assemblies and to restore airtight performance after puncture repair or replacement. Its Dunlop valve offers a balance between compatibility and ease of use, enabling simple inflation with many common pumps without additional adapters. Made from durable but flexible inner tube rubber, it combines puncture resistance typical of standard tubes with straightforward installation and removal.

Suitable for

• City bicycles with 20" (50.80 cm) wheels
• Folding bicycles requiring ETRTO 20" tubes
• Small-wheeled commuter or leisure bikes
• Bikes that specifically use Dunlop/Woods valve tubes

Key specifications

• Tube size: 20" (50.80 cm) compatible with ETRTO 20" sizing
• Valve type: Dunlop (Woods) valve
• Material: standard inner tube rubber
• Intended use: replacement/spare inner tube for 20" wheels
• Valve length: standard length suitable for typical 20" rims

How to use

Inspect the tire and rim for sharp objects or damage before installation. Deflate and remove the wheel or, if preferred, work with the wheel mounted. Use tire levers to carefully pry one side of the tire bead over the rim, insert the Fischer inner tube, align the Dunlop valve through the rim hole, and seat the tire bead back onto the rim. Inflate gradually to the manufacturer-recommended pressure while checking that the tube is seated evenly and the valve is straight. After inflation, check for leaks and ensure the tire is properly seated before riding.

Recommendations

Choose the correct ETRTO 20" tire size when replacing the tube and confirm compatibility with your rim and pump. Keep a basic repair kit with tire levers, a pump compatible with Dunlop valves, and a patch kit for on-the-road repairs. If frequent punctures occur, consider using higher-durability tubes or additional tire protection layers.