Wondering if people could provide some datapoints on the tradeoff between weight and lock security (and cost) - how often do bikes with bad/medium/good locks get stolen? I have an oldish lock (twisted steel cables wrapped in steel "knuckles" wrapped in plastic) that I'm considering replacing, but the alternatives are heavy or very expensive ($150+). Obviously the bike is worth much more than that, but there has to be a reasonable tradeoff somewhere. Do any of the better but not ridiculous locks (eg, the Abus "8" level ones) ever get defeated in practice?
I'm going to be leaving it overnight in the foyer of my block of flats, visible from the street, behind a glass door which is sometimes locked. Also, generally for a few hours or so during the day or evening around the place, but probably never overnight in strange locations. Melbourne, Australia.