the gearing/chain on my XT600E is 15/45 with a 106 link 520 chain. DID do a chain for it, oem 520V or 520VM(X-ring) as an upgrade. i recommend the X-ring over a plain O-ring.
i just got a kit for my triumph from M+P with a DID X-ring and two steel JT sprockets for £85 inc P+P, which was pretty good for a superbike kit, a smaller 520 should be less. the sprockets quality is no-frills, but solid. if you must you can get an alloy renthal rear for less lb but more £, but i dont personally think its worth it.
i got a snottoiler for xmas so im going to see if it makes any difference
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dave
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