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I would think from an engineering stand point that 520 will outlast 428... larger rollers, more surface area, not to mention thicker stronger links and side plates.... I converted my shineray to 520 for the ninja wheel supermoto conversion and I have put 1000 miles on and theres not any visible wear yet....there was visible wear on my old 428 sprockets after the 500 miles I put on em after gearing up from stock...
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