My ongaurd mini u-lock weighs only 1 pound 6.2 ounces on my kitchen scale. That's just the U-lock without the included cable. I just put the lock through my frame and rear wheel and call it a day. I do park in a low theft area, though. And I have a short wheelbase, which makes it loads easier to get the frame and wheel inside of the lock.

Use a very tiny titanium combo lock with short cable; less than 4 oz.
It will keep a casual thief at bay (depending HOW you lock it up), but not a pro.
Had a friend tell ne he could steal our tandem in 3 minutes.
Looked at my watch and told him:" GO!" He could not do it; but he said . . . "but if I some big cutters . . ."

I'm surprised that nobody has quoted the "all bikes weigh 30lbs" saying yet.

All bikes weigh 30lbs...
a 10lb bike requires a 20lb lock
a 30lb bike doesn't require a lock.

I use a Magnum 3000 u-lock. At 2.16kg (~4.76 lbs) it's no lightweight, but it does make me feel more secure about locking my bike up when I'm away from home.

I also have a heavy chain (4.5kg/9.92 lbs) and mini u-lock (473g/1.04 lbs) combo that I leave on the rack at work. When I have to transport it, it wraps neatly around my seat post.

I don't care about the weight (see my sig), I care about security. Luckily for me I get to park my double-locked bike in a fenced-in, locked compound that is under video surveillance.

That being said, I'd gladly leave my locks at home if work provided some of these bike lockers:

http://www.wilder.org/fileadmin/wild.../ream/bike.png

I have a Kryptonite New York STD U-lock. I believe it weighs 4.3lbs, maybe 4.2. Initially I got the NY FU U-lock, but I found that its small size made it less adaptable to different locking situations. If I'm going to carry around a 4lb lock, I want to make sure it's useful. The NY STD is bigger, and slightly lighter than the FU, and I feel pretty safe with it. Because I like the convenience of a small lock, I also have an Abus Granite Futura 64, mini U-lock. It's incredibly light, and I've been pretty happy with it, though I generally use it for shorter periods when I'm not far from my bike. It's lighter, narrower, and a little longer than the Kryptonite Evo Mini. The NY FU lock is a beast (no OnGuard pun intended) though. I was impressed with how thick & heavy it is. If I was a bike thief, I'd tend to avoid that lock if I had other options- which I would, thanks to everyone else using cable locks.

Does anyone know how much the Kryptolok Mini (ie "Kryptonite Kryptolok Series 2 Mini-7") weighs?

The full size version is supposedly under 2 lbs, so the Mini might be even lighter than the Onguard Bulldog. It's longer than the Onguard Bulldog, which is important because even an unbreakable lock isn't going to help you if you can't get it around a secure object.

[Does anyone know how much the Kryptolok Mini (ie "Kryptonite Kryptolok Series 2 Mini-7") weighs?]


Amazon says 2.4lbs

http://www.amazon.com/Kryptonite-Kry.../dp/B001AYQB9Y

Yeah, but the other weights on Amazon don't match with what people have posted in this thread. Someone over here says it's 0.8 kg (1.75 lbs):
http://www.guvnorownersclub.com/foru...ng-the-guvnor/

More like 50 pounds around here... My Trucker weighs 34 pounds unloaded, and I still use one of Kryptonite's New York locks with it ;-)

Your 15 pound club ride/race bike needs a 35-pound lock; my newly-adopted 50-pound Schwinn Varsity probably doesn't need a lock ;-)

The most bad-assed locks around here in central AR, though, are probably best for mountain bikes. Those seem to be the favorite targets by the ghetto rats.

When I got my bike I got the 3' Krypto chain and the bigger ulock. I considered leaving the chain at work, but I decided to keep it all in my bags. If I cared about weight I wouldn't have gotten the LHT to begin with. With these the 2 locks, the security I get more than makes up for the extra weight. Like someone said earlier, a few pounds of extra weight is better than 0 pounds for a missing bike.

i dont mind carrying the extra weight since it will protect my bike for a short period of time

leave the lock attached to the bike rack you use most often.

hardened steel doesn't weigh more than mild steel..

I bought this one as a gift for a friend and weighed it on the bathroom scale. It came in at a svelte 11.5 lbs.
New York Fahgettaboudit® 1410 3.25' (100cm)

After using U locks for many years, I am now a big fan of the Abus folding locks http://www.abus.de/us/main.asp?Scree...ArtikelGrID=11
Weightwise, they are hefty, but not as heavy as U-locks with similar protection rating, and they fold and tuck into a nice little pouch that mounts to the frame. I always hated having to stuff my U-lock into a pannier or on top of my rack.