Just to add my 2penneth, I used to race albeit on smaller cc bikes (400's), always used 520 chain, all the race teams use 520 chains, I have always used 520 chains on my road bikes ( all Ducati's) since then and Never ever had an issue, the only issues i have seen with chains coming adrift is from the use of split links and or poor fitting, maintenance etc. I have actually purchased ex race chains (and tyres) from a WSS team not to far from myself. Just imagine the power and snatch a WSS/WSBK bike will put onto it's chain over 1 race let alone a race weekend, I doubt most road user's would be able to do that to there chains over 1 to 2 years, so I have no issues with using a 520 chain on any of my bikes, but i never use a split link.
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