Replacing a tyre tube on Brompton

It is ironic or synchronistic, whatever it is.  I just got a spare tube for my Brompton, and an old tube went. 

I removed the leaky tube, and I found out that the rubber was cut at the base of a tube valve.  I am guessing that the valve must have been pushed back and forth too much when I was pumping up the tyre with a hand pump.

I replaced the original tube with one from SCHWALBE, and hopefully this won't develop the same problem down the track.

この前、タイヤのスペアーチューブを買ったと思ったら、タイヤがパンク。しかもバルブとチューブ本体の接合部分が裂けてしまって修理不可能。ハンドポンプで空気を入れている時にバルブに横から負荷が掛かったのかもしれません。

Bromptonのオリジナルのチューブと比べて、新しいSCHWALBE社製チューブは、バルブの作りが良さそう。これなら同じ様な問題は起こり難いかもしれません。

This is an original tube which came with the bike

A new valve looks stronger