questionscan anyone recommend a good bike lock?

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Very small, and light, may not be particularly doable if you want to get away with keeping your bike safe. I don't know if this is a deal or a good price, but this is what I had: http://www.amazon.com/OnGuard-Bulldog-Bicycle-U-Lock-Security/dp/B000FL3E8E/

It's keyed, sturdy, comes with a cable to allow you to loop it through a tire, and only weighs a few pounds. On mine, which may be a different/older model, there was a plastic "sheath" to protect the lock itself from the elements, which I thought was a nice feature.

Also, here are some tips for choosing the right lock for you: http://www.rei.com/expertadvice/articles/bike+lock.html

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@gatzby: Thanks! That's the most common type of lock I see around here. Now do you carry that on your bike or in a backpack? Because I'm not sure if there is anywhere I could put it on my bike without it hitting the tires? I'd like to find a lock that can be left on the bike while I ride.

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Come on! Someone! Anyone! ...now this question is buried deep in the Woot Question chasm never to be seen again.

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Go to a bike store/hto/rei and get a bike bag.

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I wind my cabled lock around the seat post, it stays away from the tire.
It's not like the one in gatzby's link, mines just a cable with the lock bits on both ends.

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You say you want something very small, lightweight, and durable, but you'll probably have to sacrifice one thing for another. Assuming your top priority is protecting your bike, I recommend these: http://www.amazon.com/gp/product/B0009V1WQQ?ie=UTF8&force-full-site=1 (Master Lock Street Cuffs) They're very well designed and reliable. The drawbacks are their weight and that they'll only secure the frame. You can take your front wheel with you or use a cheap combi cable for it. If I'm parked wisely (in a public, visible area), I just leave the wheel as is. Depending on your frame and other components (rack?), you may have a good place to carry them on the bike. I would never leave a bike locked overnight, so these have worked for me.
Feel free to ask me anything about them. I'm in New York, by the way.

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Just do not get a combination! http://www.youtube.com/watch?v=-babRDZV-UE

Also, some of the keyed locks (even ones that look solid can be wiggled out of. Moral of the story- invest in a good one.