The "Cheap chains from Andover" have a history- the history being we had loads of oproblems with the "quality" chains from Renolds (total desaster) and Iwis/Germany (not quite as bad") until I came across the CZ ones. We have used them for over a decade in racers and roadsters alike- yes, I do race primary chains, I tend to believe vintage racing is not a silouette formula but want to ride as near as posasible what they did ride then- and CZs never caused any problems as primary chains. In my German abode Norton Motors GmbH I also stock and sell them for 500, 650 and 750 Triumphs (duplex and triplex), with the same positive results.
The "cheap" price comes from purchasing a great quantity of chains from CZ themselves and has nothing to do with bad quality.
Joe Seifert
Owner, Andover Norton, Norton Motors Ltd, Norton Motors GmbH and a lot of Norton motorcycles which my kids and I do use on road and track.