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@tynan
fireball one other important thing:
On road bikes (and mountain bikes) 175mm is usually the standard crank length.
For fixed it is wise to get shorter crank arms - 165mm is good.
The reason is when you go around corners on a road bike you usually level your cranks so they are away from the ground and hold them there for a couple seconds until you have completed the corner - on a fixed wheel bike of course you cannot stop your cranks going around or keep your cranks in one position (they will always be moving) so shorter cranks will mean you are less likely to hit your pedals on the ground = crash !