>>1815191>>1815193Yes, probably. But there's still companies that make 74mm chainrings (roughly from $ to $$$): Origin8, Shimano, TA, Sugino. I'm sure there are other cheap rings I don't know about.
https://www.modernbike.com/chainrings+bcdis74+availableisyeshttps://www.peterwhitecycles.com/tach.php#zelitoThat said, 74mm rings are tiny, so you'd have a 18t or 20t difference between chainrings.
Disclaimer: I'm a "friction only" guy, so I might be missing something relating to index shifting.
You'll need longer chainring bolts & chainring spacers. The specific measurements will depend on your new 110 ring (thickness & does it have recesses for bolt heads). If you have access to an old/junk triple, it might have what you need.
Should be 5mm spacing from chainring to chainring, at the centerline of the teeth. So, whatever spacers get you that measurement. The bolts need to be the length of your current ones + the spacer + the new ring.
Chainring spacers are commonly 1, 2, 3mm, but Wheels Mfg at least makes a bunch of other sizes. A local shop might have one of these kits.
