Rated 3 out of 5 by Anonymous Solution ! to the seizing up problem
I bought 4 of these and at first they worked fine. After a few weeks of regular use, they all started to seize up. This is a commonly described problem with these locks - see the many complaints on Amazon. It becomes very difficult to fully insert the key, and therefore impossible to fully engage the pins and turn the key to open the lock.
I seem to have solved the problem with mine. The keys have a very blunt, rectangular tip. I got a metal file and gently filed a bevel on 2 sides and 2 edges of the tip of the key. This helps the tip of the key slide into the final level in the lock and lets you open the lock again. I tested this with one key filed and another unfiled (as original), and the filed one definitely has more success. Still stiff, and needing a jiggle to fully engage, but usually success after a few seconds.
Otherwise, this is a very beefy, solid lock, about 900 grams. Heavy, but easy to wrap around handlebars and carry. I imagine it would take serious work with an angle grinder to defeat this lock.
10 October 2012
Rated 3 out of 5 by Anonymous Strong but...
The chain looks stiff and with a very detailed factory assembly! Security level 8/10 and 90cm long with 8mm thickness. You can lock your bike around a tree easily. But? its much more a motorbike chain. Too heavy for a daily rider. Almost 3,5kg. I got it in Red, nice color.
08 October 2012
Rated 3 out of 5 by Anonymous Great lock, doesn't last
Had this lock twice and both times it started to seize up after a few months. Remedied somewhat by oil but is completely unopenable now. I leave my bike out a lot, obviously doesn't agree with the lock mechanism.
Otherwise very strong and sturdy.
16 March 2011