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That sucks. If you have to leave your bike a lot in a high crime area try these:
http://www.peterwhitecycles.com/pitlock.asp
Seats are a hot thing to steal - mostly because it's fun to watch people ride off without one. I bet the thieves were still nearby and giggled away.
When I was in college, someone went down the whole, long rack of about 30 bicycles and took the seat or the front wheel off of every one they could.
Lock your seat, your front wheel - anything that comes off quickly.
And, kudos to you for trying to be green. I'm doing the same.
It does suck big time.
I agree: many thieves are "opportunity driven" and will just take something for "fun." I had tie-wraps attaching my seat to my bike on my former bike, which proved enough of a deterrent for two years. (One would have needed to have a good pair of scissors to cut the tie-wraps.) Now on a different bike I don't have anything (but the quick release) but I feel like I'm waiting for my seat and seatpost to be stolen. I really hate them and just need to go and replace them, so I haven't bothered securing them. (Silly me.)
This is horrible!
Try an alarmed lock - it will start a very loud siren if someone does as much as touch your bike or slightly move the frame or components. It attracts a lot of attention (and cops if they happen to be in the vicinity) and it's quite a deterrent!
This was posted on another board as a How to Lock Your Bike demo.
The cable lock starts on the front wheel, winds up and through the seat rails, goes down and connects to a U-lock that is on the rear wheel and bike rack. Might not deter someone really intent on ripping you off, but for the random "steal the seat for fun" twerps it should work.