Which Sugino crank is this?

Spider has no tabs for inner chainring, so I’m guessing it’s a track crank. BCD is 144. Backside says “49-I”, “171” (wtf length?) or “I7I” and “M-14”. Should I go for an ISO or JIS bottom bracket?

probably ISO

edit: wait, thats 171? Gimme that, I have a matching nds arm, been looking for 171 ds arm.

It is a Sugino Mighty or maybe a Super Mighty crank arm. 171mm is the crank arm length. 49-1 is the date code and is Jan. of 1974. M14 is the pedal threads aka French threaded. No backing plate on the spider would indicate a track crankset and it would probably be ISO and use a 109mm spindle (same as current Sugino 75 track cranks).


Serious about the pedal threading? I just tried a standard 9/16" pedal on the crank and it threaded on seemingly perfectly, with no resistance. Are these semi-interchangeable? edit: I just checked Sheldon, it seems a French thread can be tapped to take standard 9/16" pedals, this seems to be the case.

No, you gimme that nds arm.

Tons of thanks for the info. I got the crank for 3 euros, figured it was something of a good deal. Now if only I had a matching nds arm for a similar price.

edit: Until I find one, will I notice the difference if I run this with a 170mm nds crank? Were these actually manufactured in 1mm increments? Whoa.

hell no!

I think they were made in 3 mm increments. I have seen 165/168/171. Probably didn’t have the .5mm capability back then.

regular mighty

Moderately Mighty.

Sugino Super Weak

sugino mighty mouse


can we get this thread stickied?

Somewhat Mighty.

slight might

Not Especially Mighty