Here are some interesting cranks that I've used on various builds of my singlespeeds
(except for the Profile Ti, which I have only one arm of).
The important thing to keep in mind is that running just one gear will place a lot
of stress on the drivetrain, so use a crankset that is appropriate for your weight
and power. As for crank length, a lot of that depends on your personal preference,
along with your bodily dimensions. A good starting point is around 175mm for offroad use.
Bullseye with standard spider (chromoly)
McMahon Racing Steely Danz (chromoly)
Early Cooks Quality Products (chromoly)
Profile Racing with Euro BB (chromoly)
Shimano 1st-gen XTR (cold-forged aluminum)
Cooks Brothers titanium
Morati titanium
Profile Racing titanium (rare - this is the driveside arm)
