Originally Posted by
T-Mar
That's not OEM gearing. According to my literature, the crankset was a Takagi AD with 52-47-34T chainrings, while the freewheels was SunTour Perfect with 14-16-18-21-24-28T cogs.
Given your long experience with this kind of stuff, I'm happy to take your word for that. I just assumed the drive train was original because all of the components are have similar date codes. This one has an 86 BCD Sugino crankset and a Shimano freewheel. I'm probably going to replace it with a Suntour Perfect.