Lock related
- Have a better lock than the bike next to yours.
- At the very least get a lock such as this one: http://www.bicycleworkshop.co.uk/products.php?plid=m2b1s93p186 they are relatively difficult to break and are easy to operate meaning you'll lock your bike as a matter of course.
- Don't use a cable lock. Bolt cutters snip them in like 5 seconds.
Location
- Use a U-lock or solid chain lock (links thicker than 12mm) to attach your bike to something, but (and this is important) never lock your bike to something that would make it inconvenient for someone else.
- Lock the bike to something solid.
- Never leave your nice bike outside overnight or for extended periods of time during the day (but you're already doing this because you don't want to leave your precious bike out in the rain right?).
- it should be in a reasonably populated, busy area
- if you park in one area frequently, try to move around a bit - thieves might notice a decent bike often in the same place
Bike Tips
- Get a cheap, ugly secondhand bike for city use.
- Get allen key skewers as opposed to quick release
- Keep your lights and/or cycle computers with you, not on the bike