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My chain broke and in a moment of silliness (I was cold wet and slightly annoyed) I threw the broken one away before thinking about measuring the new one.

Is there a guide to getting the chain length/tension correct ?

It's an 8 speed road bike (Shimano Sora back, double ring front)

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up vote 9 down vote accepted

Put the chain around the big-big gears without threading it through the derailleur. Have the chain overlap by one link. Now with that length thread it through the derailleur.

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How did I miss that - I checked the great prophet sheldon's site. My Zinn book talked about the one extra link - but implied that a link was half of the link-pair that the sheldon picture shows. – mgb Dec 14 '10 at 16:50
Most people consider that 2 links, including Shimano. – zenbike Aug 7 '11 at 14:38
@zenbike So the correct overlap is two half-links or one full-link (depending on which definition of link you use), right? – amcnabb Jun 3 '13 at 19:11
One outer and one inner link. If you consider a single inner or outer to be 'one link' you cannot connect the chain. you'd have to use a special 'half link' to do so. – whatsisname Jun 3 '13 at 21:51
Yes, that's correct. – zenbike Jun 4 '13 at 16:46

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