I am building a new rear end assembly for my wife's Roadstar and going to chain drive. If anyone has experience with chains, what would an 18t drive with a 36t driven sprocket do for us? And if you could give me an idea of the chain length it would assure me I calculated it right. Going with the above sprockets and a 530 by 130 "O" ring chain. I will machine any adapters to fit the chain sprockets for the bike. This last motorcycle trip we had to buy ANOTHER drive belt at $300. I figured out why the belts keep breaking, but still want a chain drive for if one fails, I'll have a spare with some master links ready to go. No disassembly required to install the new chain.