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@Pragma
Hi,
This is Steve from Pragmasis, manufacturer of the Protector chains and Torc ground anchor etc.
Could I suggest it would be helpful to identify the gauge of our chains that are being described in your entries, please? I don't have any complaint about anything that has been said and continue to be pleased that you've taken the time to put this list together and to maintain it, but we produce a range of chains and describe them all honestly, so we would not suggest our 13mm or 11mm chains should be included in this topic as we can't guarantee either of them to be impossible to bolt-crop with 42" croppers. However, both our 16mm and 19mm chains are impossible to crop and are equivalent to the 16mm and 19mm Almax chains in our opinion. We do suggest that the 19mm is often too heavy to use with bicycles but we do have a small number of customers using it where they have extreme requirements and don't mind the awkwardness of manhandling a really heavy chain. The 16mm, however, is a more sensible solution for high end bikes and we have a lot of customers using it as such. Even that, though, at 4.5kg per metre length, is a heavy thing in long lengths and must be handled carefully to avoid damaging a precious bike.
We are always happy to answer questions plainly and honestly. I'm the one that checks the lab test results on every batch of our chain as well as the one that has designed all of our products to date and am happy to give 'engineer' advice rather than be a pushy salesman (which I'm not!).
I hope that helps,
Steve.