Hey all,

I just discovered that the crankset (Sugino VP 165mm) on my commuter bike is a triple, even though it only has two chainrings. It's a 1980s Centurion Sport DLX, with a 6 speed freewheel on the back.

I've got a 30t chainring from an old Tiagra triple crankset (came off a 2008 Cannondale CAAD9 R6).

I was wondering if I could run just attach that to my crank, readjust the FD, and possibly fix the chain length in order to have a triple. The bike comes with DT shifters, so shifters won't be an issue.

The end result would be a 50-42-30 with a 14-28 in the rear. Would this work? Also, I don't have any bolts to attach the small chainring to the crankset. Any idea what kind of threads it uses?

If I could get this working, it would save me from buying a new bike as a commuter. I sold my previous bike, because I needed a triple. I'm going to be living up a hill that's a third of a mile long and averages 10% grade.