I have a Big Dummy frame on the way and have a donor bike with xtr shifters/brakes that I am planning on using. I am going to go ahead and install a new headset and bottom bracket but am not sure what length cranks I should put on the bike? I have some cheap no name cranks on my donor bike now and am thinking about going ahead and upgrading them at the same time as the bottom bracket. The other question is what chain rings is most everyone running up front? Would you guys suggest I re-use my mtb geared front sprockets or should I change to something a little lower geared? Any info is greatly appreciated.