Originally Posted by
TrojanHorse
3 critical things to consider:
Bottom bracket compatibility (e.g. English threaded, Italian threaded, BB30 etc)
Crank length (170mm to 175mm are common)
Double or triple
Bonus - chain compatibility. Most are either Shimano compatible or Campy but you don't want to mix them.
Upgrading cranks is usually a matter of increasing stiffness or decreasing weight and both are expensive to do.
Thanks mate, with my serious lack of knowledge I might buy a cheap one or a second hand bike and pull one apart to look at it =) that is how I learn the fastest