Ah, did you try wacking them? Mine were tough but a good wack on the head (them not me) with a hammer helped. You'll need to get them off anyhow (or the old system is un-usable) so cutting = last resort.

Heating them is another method.

Swearing should accompany all methods, iv'e been reminded of this today with my first try at a motard tyre change- Argh

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XTX 09