New Crank

Hey probably a simple question but how do you measure your Crank? Is it from the centre of the bottom Bracket to the centre of where the pedals go on the arm?
Also any suggestions for upgrades? looking at SLX from my Deaore. Don't want to go too crazy but want quality.
Cheers
@munkyallt
Also any suggestions for upgrades? looking at SLX from my Deaore. Don't want to go too crazy but want quality.
Cheers
@munkyallt
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Parktools :?:SheldonBrown
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Parktools
http://www.sheldonbrown.com/cranks.html
May be different if you're riding a single speed though.