Uhh Hmm i was abt to advise how not to get ur bike stolen cos
mine never got stolen before until I saw this. My regular bike is
those mini one, bright pink.. err hurhurhurhur No wonder nobody
want har?
Anyway I very kiasu cos I used to cycle MTB quite regularly
too.
First line of defence -
Stainless steel chain links, each link about 1 inch, thickness of
link about 5 mm each. Heavy like hell, but put in basket lah.
Regular wire cutter/pliers cannot cut these. So it is not so
convenient for them to remove it.
Second line of Defence
Those rectangular lock that has just enough space for you to put
the two links together so they can't cut the bar in between
either.
Last Line of defence
Chain front wheel AND body, if possible in place where human
traffic is heavy.
But if yours have a quick release seat, and back wheels. It's
goodbye to them too lah.