A less-common Japanese road bike....

[juvela]

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I have the same crank and derailleurs for my Miki (and Sunshine hubs). I think the taper is Suginos own as ISO came later but they are both similar the old campy taper. I just used 70s Campagnolo Record BB with the Sugino Super Mighty crankset.

I think the common square taper widths or profiles are
Narrow: Ofmega
Medium: ISO, Campagnolo, Gipiemme, Sugino, most NJS square taper?, Omas, some old French spindles like Nervar, Mavic and Stronglight
Wide: JIS(Shimano, SR), some French spindles (TA?)

Does anybody know where the 171mm crank arm lengh comes from?

the 171mm length is the metric equivalent of 6 3/4"

was widely employed on early Sugino products

much the same that the 71mm shell width was much employed in Japan for a number of years as it is the equivalent of the Raleigh 26TPI shell


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[Freeman]

Well, I took it all apart and put it back together and took another photo of it, and it looks pretty much the same. The "Italia" seat is off an old Motobecane I used to have which was about the same year as this bike, and I put Velox black cotton bar tape on the bike. Also got rid of the self-extracting Shimano crank bolts and put regular crank bolts in and covered them with a pair of Sugino covers I had in my toolbox. Tires are a used pair of Conti gatorskins. I hung the bike on a scale with some old alloy road pedals installed and it was 22 pounds dead even. I think I would like to get a shorter stem for it at some point in the future if I am going to ride it regularly, as the reach to the seat is further than I am used to.