My track sprint bike and pursuit bike both have 167.5 cranks. Both sets are Dura Ace and I have a Stages power meter on a crank arm that I switch between bikes. My road bike is set up with 172.5 cranks. Without looking I don't know what the mtb, cross bikes and SS/fixie cross bike crank arms are. I really don't feel a difference when riding them.

Recently I found out something about my pedal stroke that is good news for me. I have two fused ankles with only limited motion in my foot. While getting a professional fitting on the bike that I will use for the pursuit and team pursuit the fitter found that I have no dead spot in my pedal stroke and both sides are with 2% of each other. At first he didn't believe his machine was recording correctly and had me move to one side of the saddle and ride only pushing down. That showed showed dead spots and inequities in leg strength.