I will also agree that using lightweight tubes can be a VERY big problem!! I have had several blow just like some of you have mentioned... the bike can be standing still and the next thing you know it blows.... Bonty tubes definitely have a problem, and wise to switch to something else. Although I know it's hard to envision that a tube can explode without the tire coming off the rim... it really DOES happen. Unfortunately, tubes can have a weak spot in them, and may not blow for quite some time... I have tested this in the shop, and you can actually see where the weak spot is.... it will expand completely different than the rest of the tube... it may expand larger or be a smaller area. Unfortuantely when a manufacturer has a problem such as this, it not only happens to one tube... it generally happens to a whole run of them... hence you can have the same problem with more than one or not... Anyway, hope the problem is a thing of the past!