Short answer: Yes they're rubbish and do not last very long.

In English they are normally described as "cush drive rubbers" (as in 'cushion'). If you try searching using those terms on the forum you will find how other people have improved their life using inner-tube rubber.

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I spent a lot of money on travel and racing motorcycles - the rest I just squandered.

XT660Z - Commuter, Adventurer...Racer?

www.dashmoto.net

Other bikes >> MT-03 / CG125BR-J / ER-6F
Departed >> ZXR400L3 / EC300 / DR-Z400E / DR800S / GPZ500S / GS400