DECATHLON

BMX AIR CHAMBER 20 "x1.3/8 VALVE PRESTA/ ETRTO 32-40/438-451

4.40
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Ref. : 8543087

Designed for BMX race use with 20x1"3/8th tires.

20x1"3/8 Presta valve threaded inner tube for BMX race bikes.

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PRODUCT BENEFITS

Compatibility

For 20x1-3/8th tires and wheels. Presta valve (small valve). ETRTO 32/40 - 438

Waterproofing

Optimized composition to ensure a good seal on your inner tube.

Weight

129 grams.

TECHNICAL INFORMATION

How to choose an inner tube :

Note all the information visible on the tire's sidewall (diameter and section). For example, 29x2.00 means a tire with a diameter of 29 inches and a width of 2.00 inches.
On the tire sidewall, you'll also find the dimensions in mm in the international ETRTO unit.
For example, 50-622 means a tire with a width of 50 mm and an inside diameter of 622 mm (i.e. 29x2.00).

Removing the inner tube:

Dismantle the used inner tube using B'TWIN tire changers

Checks before fitting an inner tube :

Check the condition of your tire, and replace it if necessary.
Make sure there are no foreign objects in the tire.
Check the condition of your rim tape and its correct positioning.
Even a slightly cracked rim tape can cause punctures.
Check your rim for any alterations that could damage your inner tube.

Fitting the inner tube :

See our video before you start.
Pre-inflate the tube slightly to avoid any risk of pinching.
Insert the valve into the valve hole, making sure you use the correct type of valve for your rim.
Place your tube in the entire tire, pushing the tube so that it is positioned in the hollow of the rim.
Make sure you don't pinch the tube when you finally mount the tire.

Tire mounting :

Start by mounting the tire on the valve.
Finish the mounting on the opposite side of the valve to avoid pinching.
Never mount your tire with a tool or tire lever, as this can pinch and puncture the inner tube.

Tire inflation :

Inflate your tire carefully, to the pressure recommended by the manufacturer (visible on the tire sidewall in PSI or bars, 1 bar = 14.51 PSI).
Regularly check that the tire is correctly positioned when inflated.

Pro tip:

To avoid pinch punctures and get the best performance from your tire, we recommend that you check and, if necessary, re-pressurize your tire before every outing.

Warranty

2 years

VIDEOS

COMPOSITIONS / ADVICE

Composition

Main part 80% Isobutylene butyl isoprene rubber, 20% Brass

STOCK TIPS

Transport your inner tubes in a container that protects them from punctures (B'TWIN transport canister, original packaging, etc.).

Restrictions

Take care not to pinch the inner tube during assembly.

TESTS

To guarantee optimum quality, we check 100% of our inner tubes by pressurizing them for 8 hours.

USER REVIEWS

Questions & answers