Ha ha, Dave Shimano use a 24mm axle size
if your familar with mtb cranks
square taper( used on cheap trial setups tend to snap axles and round off crank arms square fittings)
octalink ( used by Shimano as there alternative to isis not trials specific)
isis ( used by truvative, fsa, raceface ect.. Stronger axle less likely to snap and much less likely to round off used also by most trials crank systems)
fsa omega drive 15mm axle size ( fitted to road bikes)
gxp truvative 24/23mm axle ( fitted to mtbs and road bikes)
Shimano, fsa and race face 24mm ( fitted to mtb and road)
e thirteen and raceface 30mm ( very similar to as30 can be fitted using there bb to any frame)
sram bb 30 ( only fits bb30 or pressfit 30 frames.
crewkers as30 uses a 30mm axle but as with the race face and sram 30mm stated axle size i am still to find out what there axle diameter is.
the sram uses a shorter axle lengnth than the as30 and raceface/e thirteen cranks