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apparently my ideal crank length in 180mm.... obviously too long for fixed gear.
i however feel like im spinning a kiddie bike if i use 165's and i feel im not getting into the power stroke of my pedalling, if that makes sense.
i use 170's or 172.5 generally.

Crank Length Calculator

Well, Mr Burrows always like to challenge convention. Scroll down to his thoughts here

http://www.bikefix.co.uk/index.php?get_ol_id=1&get_gl_id=62&r_full_id=7