Originally Posted by jim-bob
Alan - Do you have an opinion on the OnGuard Bulldog Mini u-lock? I'd be interested to hear what you think about it.
All of the OnGuard Mini U-locks are unbreakable by leverage and breaking attacks when they are correctly installed (around the rear wheel, just behind the seat tube). They are as strong against leverage attacks as the BEST lock sold in the USA, the Kryptonite New York 3000 U-lock.
But, the OnGuard design can sometimes make it difficult to engage its dual bolts. The bolts must be perfectly aligned with the "cuts" in the shackles for the key to turn easily. This problem varies lock to lock. I have one OnGuard Mini where the key turns easily...the other one is always a bit of a struggle to get the alignment that allows the key to turn easily. And, if you "force" the key, you could break it.
And, as mentioned in the "Flat Key" thread, all OnGuard and Kryptonite locks with the flat key design share an irritating quirk: if just one of the seven to ten plates inside the keyway goes out of alignment, you may be able to turn the key, but you will NOT be able to unlock your bike.
An easy fix: shine a light into the keyway, and use your key to turn each plate, one by one, until all ten are in perfect alignment...takes a few seconds with some practice. Then, insert the key until it presses firmly against the bottom of the keyway. When you turn the key, you will be able to unlock your bike.
How to CORRECTLY Lock a Bike: by Sheldon Brown
Last edited by alanbikehouston; 05-02-05 at 09:52 PM.