Join Date: 09-20-2004
Location: Queensland, Australia
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further to what exit90a said, a 520 conversion also gives you a significantly lighter chain - nearly a full kilo - and it removes weight from a key part of the bike, reducing inertia, so it's well worth considering.
I've run a DID520VM chain and found it to be excellent, though wouldn't go past an RK if the price was right.
Currently I'm running a RK520GXW with a VAZ steel front sprocket (15) and Talon alloy rear sprocket (43) which has been a great combination around Phillip Island.
I'm going to replace the front sprocket with an AFAM because the centre hole has not been punched correctly and the sprocket does not run true - making the chain run loose then tight (not massively but enough to make it noticeable when adjusting the chain - probably saps a little horsepower too).