I have a set that's 170mm - for the buyer just be real careful when torquing them on as they will crack. Ask me how I know. It's too bad because I love the look of the crankset.

Per my email conversation with Eric Sampson:

"We are aware of the issue, and it is why all the Sampson cranks were sold with precise mounting instructions ---and all cranks sold after 1995 also had a full warranty registration that required the installer to sign the form and fill in the torque setting-- While it is standard now for cranks to have a torque setting-in the 1990's most people ignored it, and the result would be a fracture as you describe, which was the result of simply pushing the cranks too hard onto the taper of the bb-

We had really about 0 issues with this series as I designed in a big addition of material on the top of the crank set, and the pedal flats, and most importantly, for a warranty (one year btw) owner needed to send in a warranty card that required the installer to certify and sign the torque used for the crank installation- To pop the top so to speak on this series took significantly more torque than the 250 in /pounds we required"