20"x1.3/8 / ETRTO 32-40/438-451 Presta Valve BMX Inner Tube




₹ 199.00


Made for
20x1"3/8 threaded Presta valve inner tube for BMX racing.
Sizes guide

CompatibilityFor 20x1-3/8" tyres and wheels. Presta valve (small valve). ETRTO 32/40 - 438
WaterproofOptimised composition to ensure your inner tube has a good seal.
Weight129 g.
Warranty2 Years
Technical Information

Choosing an inner tube:
Check the information indicated on the sidewall of the tyre (diameter and width). For example, 29x2.00 means that the tyre is 29 inches in diameter and 2.00 inches wide. On the tyre sidewall you will also find the dimensions in mm in ETRTO international units. For example, 50-622 means that the tyre is 50mm wide with a 622mm internal diameter (approx. 29x2.00).
Removing an inner tube:
Remove the old inner tube using B'Twin tyre levers
Checks to make before installing an inner tube:
Check the condition of your tyre and replace it if necessary. Make sure no objects are lodged in the tyre. Check the condition of your rim strip and that it is positioned correctly. A rim strip that is even slightly bent can cause punctures. Check that your rim does not have any other issues that could damage your inner tube
Installing an inner tube:
Watch our video before you start. Pre-inflate the inner tube slightly to avoid pinching. Insert the valve, making sure you are using the correct valve for your rim. Put the inner tube entirely inside the tyre so that it fits inside the rim. Take care not to pinch the inner tube when fitting.
Fitting a tyre:
Start mounting the tyre at the valve. Finish mounting the tyre opposite the valve to avoid pinching the inner tube. Never mount your tyre with a tool or a tyre lever, as you risk pinching and puncturing the inner tube.
Inflating a tyre:
Inflate your tyre carefully, to the pressure recommended by the manufacturer (visible on the tyre sidewall in PSI or bars, 1 bar = 14.51 PSI). Regularly check that your tyre is in the correct position as you inflate it.
Pro advice:
To avoid punctures from pinching and for the best tyre performance, we recommend that you check your tyres and inflate them to the suggested pressure before every ride.
Information / Concept / Technology
Main part : 80.0% Rubber - Isobutylene Isoprene Rubber - Butyl, Main part : 20.0% Brass

Product test
To guarantee optimal quality, 100% of our inner tubes are inflated for a period of 8 hours.

Stockage tips
Carry your inner tubes in a container to protect them from getting punctured (B'Twin carry case, original packaging, etc.).
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