Designed for 20-inch tyres and wheels (junior bikes).

    More details
    SKU: S67 (176449)
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    Size Guide

    Delivery in 6 to 7 days

    € 3.00
    Our e-commerce is suspended for a transition period. We expect to be back soon!
    Product benefits
    1. Compatibility
      20" wheels and tyres with a 1.7 to 2.2 cross-section.
    2. Waterproof
      High quality valve that retains pressure.
    • Weight
      154 g.
    • Material
    • Sold
    Product feature
    1. Choosing an inner tube
      Write down all visible information from the tyre sidewall (diameter and width). For example, 26 x 2.20 means your tyre is 26 inches in diameter and 2.20 inches wide/. . You will also find the dimensions in mm in international ETRTO measurements. For example, 50-559 means the tyre is 50 mm wide with an inner diameter of 559 mm (approx. 26 x 2.00 inches).
    2. Removing an inner tube
      Remove the old inner tube using B'Twin tyre levers (ref 8047839).
    3. Checks to carry out 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. Even slightly bent rim strips can cause punctures. Check that your rim does not have any other issues that could damage your inner tube.
    4. Installing the inner tube
      Pre-inflate the inner tube slightly to avoid pinching. Insert the valve, making sure you are using the correct valve for your rims. 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.
    5. Mounting the tyre
      Start by mounting the tyre from the opposite side of the valve. Finish at the top of the valve to avoid pinching. Never use a screwdriver or tyre lever to mount the tyre or you could pinch the inner tube and puncture it.
    6. Inflating the 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 the tyre in correctly positioned as you inflate it.
    7. Tip from the pros
      To avoid punctures from pinching and for best tyre performance, we recommend that you check your tyres and inflate them to the suggested pressure before every ride.
    Product testing
    1. Composition
      Material: isobutylene. Weight: 154 g.
    2. Storage advice
      Transport your inner tubes in a container that protects them from perforations (b'twin carry case, original packaging, etc.).
    3. Cleaning advice
      To find out the size of your wheels, check the inscriptions on the side of the tyre. Always have a spare inner tube and a pump.
    4. Product restrictions
      Take care not to pinch the inner tube when fitting.
    5. Product catchline
      Schrader inner tube (large valve) for 20-inch tyres and wheels.
    Product reviews
    2.3 / 5
    4 reviews
    4 users recommend this product
    Write a review
    • So far so good

      firman (United Kingdom)
      Used for 2 to 8 weeks
      Upon fitting the inner tube to the tyre with some air in it, it seems the tube is longer than the tyre. It kind of folds a bit (BTWIN Foldable bike) after fitting.Who knows if it's still folder once fully inflated.

      So far it still holds the tyre and works....
    • Quality or installation seems to be the problem.

      Tabrez (India)
      Used for 1 week or less
      After getting the tube replaced, we found out a puncture again the next morning.
      Response of the brand
      Thank you for taking the time to give us your feedback. Inner tubes and tires are wearable components and it is possible for punctures to happen due to external factors and internal problems like pinching and spoke piercing. Please get the wheel diagnosed again for any such signs. Feel free to write back if you have any questions. 

      Deepak Babu E-sport manager DECATHLON
    • Good quality at low cost

      David (United Kingdom)
      Used for 2 to 8 weeks
      Bought a pair for my fold up bike and sons BOX. These are superior to the cheap innertubes sold by other shops.
      Low cost. Holds air well.
    • Poor quality

      Andre (United Kingdom)
      Used for 2 to 8 weeks
      I think maybe on this occasion it would have been better to have paid for a better quality tube
      Very poor quality meaning prone to punctured
      Response of the brand
      Dear Sir,
      I'm sorry to read that you have had a puncture.
      Peter Lazarus UK Market Manager DECATHLON