Originally Posted by
alanbikehouston
OnGuard locks appear to be sold in the UK under the Magnum name. Take a look at the lock tests and ads in "Cycling Plus" to see which UK locks do well in testing. I'd think a good public library in the UK would have back issues, and I think the test reports may be available by Fax as well.
I've had horrible luck with OnGuard/Magnum locks freezing up due to what I think is a combination of humidity and road vibration. After three locks did this I'll never buy or recommend them again.
Neither my Abus or Kryptonite locks suffer from this problem.