Current 650 build has come up against a snag. Its a 530 chain but has 900 a4 CMA's so needed a 530 900 rear sprocket. The only one available is a 47 tooth. So I compensated by increasing the front sprocket to keep the stock ratio the same. But this has caused a problem. The chain run now touches the Dresda Box section swing arm bracing. So tried a stock front sprocket to lift the chain a tad but it's still just scraping even with the rear shocks under load.
So my dilemma is 1, find a 36 tooth A4 rear sprocket for a 530 chain or 2, take a chunk out the swing arm brace.
Unless you bike builders can come up with a simpler alternative. which would be nice as taking a chunk out is a pain and a smaller diameter sprocket doesn't appear to be available.
