What length should my chain be?

pechacheli

I've just changed my 105 chainset from a double to a compact. I have a new chain and 10 speed cassette however I am not sure what length the chain needs to be?

Usually I measure the new against the old but would this be ok given the chain rings are now smaller?

Is there a standard way of measuring the length regardless of the chainset/gears?

Any advice would be gratefully received.

Thanks

anyuser

This explains it better than I could:

http://www.parktool.com/blog/repair-hel ... gth-sizing

I would look at the largest cog to largest chainring method.

Smokin Joe

I use this -

http://www.machinehead-software.co.uk/b ... hcalc.html

pechacheli

many thanks all..