Lots of fixed-gear riders (Sheldon Brown, and the crowd form the SS/fixed forum) would suggest that running 165mm to 170mm cranks are the norm (faster spinning, less risk of pedal strike, etc.) But if the goal is just fixed gear training for road racing, should your crank arm length be different from your road bike?

I'm asking because I ride 175mm arms on my road bikes, and I don't like the idea of having my fixed gear bike fit differently...

Thx.