Originally Posted by
Atlas Shrugged
The gearing range is determined by the capacity of the derailleur system and not the number of chainrings. A wide range 11 or 12-speed 2X system has the same gearing options available as any 3X system.
Can you give an example? You appear to be talking specifics and I did say I was talking what was common and in general.
On common road bikes, a 34 is the smallest ring for a 2x. On 3x a 30 is common. So for the same cassette a lower low with the 3x.
Usually I've seen that on 2x cranks to get a smaller small, you also have to get a smaller large ring. And that affects top end ratio which the 3x will be able to give.