Originally Posted by
Leebo
What? Slightly older mountain triples were 64/104 bcd. Standard 3x9 drivetrain. 22-26, 32-36 and 42-48. Most were like 22, 34, 44.
22-32-42 was the most common, actually. And that's why most mountain bikes will not clear a 30t granny like the one someone was recommending. You may be able to make that 30/39/50 road triple work by using a longer-than-you-should bottom bracket spindle, at the expense of chain line.