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The OnGuard Bulldog Mini is tough yet weighs under 2 pounds.

| Average weight: | 1 lb. 11 oz. |
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| Dimensions: | 3.5 x 5.5 inches |
| Integrated lock: | Yes |
| Material: | Hardened steel |
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View other products from Onguard classified in Cycling > Locks. View all products from Onguard.
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These are products that have been indicated being comparable to this product:
| Onguard Beast Chain Bike Lock Cycling > Locks | $89.00 | |
| Onguard Bulldog LS U-Lock Cycling > Locks | $42.00 | |
| Onguard Terrier Combo Cable Lock - 6mm Cycling > Locks | $12.00 |
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Survived a Half Year NYC messenger work | |
| Rating: | ![]() |
| When used as a supplement for my heavy-duty 4ft, 25lb chain lock, the Mini gave me a feeling of added security in the most theft-prone parts of New York city over a half-year of bike messenger work in Manhattan. On my track bike, I could just squeeze the rear-wheel, seat-tube, and a street-sign into the U for a very quick run inside (5-mins or less) and a thief could only fit maybe a piece of re-bar inside the U to try and twist the lock off. This meant that even in places like Chinatown, Alphabet city, and Brooklyn I could save time and energy of using my heavy chain lock for very quick drops. When you lock you bike up 50 times a day, it makes a difference. I often slap my Mini onto my top-tube and around a sign even when I am using the chain, and when the chain has to reach around a big light post and the front wheel, I slap the Mini onto the back wheel. The cosmetics of this lock (anything not steel) wears off in a week or so of heavy use, but the simple shape makes electrical-taping easy to avoid scratching your paint or freezing your fingers in the winter. Even the vinyl on the shackle of my lock is still somewhat intact. Despite AT LEAST two attempts by NYC thieves to bust through this chunk of steel, it's held up and been a great tool in my lock-kit. Just don't let it be your ONLY lock unless you are in a more tame place, such as Boston or Philly or Chicago. | |
| Nick 301 at REI on 01/14/2009 | |
Good Value Mini U-Lock | |
| Rating: | ![]() |
| This is a good mini U-lock at an affordable price. Not as technically theft proof as the more expensive Kryptonite, the advantage of this mini U is it prevents the most common tactics of thieves. Larger u-locks are susceptible to being broken with a car jack. The mini is too small to fit a car jack inbetween the bars. Also, the double locking barrel makes it harder to freeze and break with Liquid Nitrogen, and the lock is also not susceptible to infamous Bic Pen lock picking. If you don't want your bike stolen, use one of these. It is hard to get the front wheel and the frame attached to an object with this lock, but that's part of what makes it secure, so if you have fancy quick release wheels, use something else. | |
| The President at REI on 10/12/2007 | |
Great Little Lock! | |
| Rating: | ![]() |
| Really nice sized lock. Just big enough to reach between the frame and most lock-up areas. I picked this up after reading about how you can open up other locks with a bic pen and successfully attempting to do it with my old lock. I would get a burlier model if I locked up overnight in bad areas, but for daytime around town this works great! | |
| bikesncoffee at REI on 04/13/2009 | |
Great lock, good price. | |
| Rating: | ![]() |
| This lock is great, easy to stow, and easy to use. Small u locks are much harder to break than some of the oversized ones, so this adds security as well as a lighter weight. The frame holder is a little wonky, but it has held up for over a year and not completely broken (like some otherlock brackets I've used). Still a little weird. | |
| kraken at REI on 10/23/2008 | |
good lock for the price | |
| Rating: | ![]() |
| Decent lock for the money (on sale). My only complaint is the top of the key is large, square and very pokey. Not for pocket use. My husband has a Kryponite with a much better key design (small oval). I only use this lock in the daytime on my fixed gear. I probably would not use it in a high crime area or at night. | |
| eug or at REI on 06/27/2008 | |
disappointing - buy a kryptonite | |
| Rating: | ![]() |
| while it's appealing in it's compactness, it's unusable as it's designed for mountain or aggressive bikers. before ever installing it, one of the yellow plastic ends cracked off. i super glued it back onto the lock, but is still is cracked. you can't ratchet it where the lock hangs out of the way of pedaling or the rear tire and/or where it won't scratch the paint. the pin that connects it to the holder is so loose it allows the lock to move about and make all kind of noise. it got so loose it swung over the rear tire and began to rub, so much that part of the plastic coating is gone. when i went to lock it up, the same loose pin got stuck inside the lock holder. it's unacceptable for a [$] lock to be this useless. buy a kryptonite instead. | |
| spychic at REI on 07/13/2009 | |