Joined: Jan 2008
Posts: 23,643
Likes: 1,107
From: Mans of NC & SW UT Desert
Bikes: 86 Katakura Silk, 87 Prologue X2, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more
I've stopped buying new cranksets and chainrings. I tend to use homemade compact doubles on my vintage bikes. Start with a Sugino double that has 110 spacing. Add chainrings off a MTB donor bike, often, the two largest rings are in the 48+/-, 35+/- sizing.
Older MTBs can make great donors. Long cage rear derailleurs, triple cranksets, thumb shifters, desirable pedals, etc.