LittleGreyCat wrote:At my modest average speed of around 12 mph I can pedal successfully on all 3 front rings.
I have in the past found myself on the smallest front ring by mistake and only noticed when the chain grumbled as I went for the smallest rear sprocket.
So speed over the road and cadence can trick one at times.
Which brings me back to indicators on the front which avoid looking back past my ankles.
If set up correctly then a triple will have roughly 2 sprockets between each chainring and a double will have 3.
So with a 9 block, you should have roughly 5 sprockets you can use with all chainrings, but this does include big-big and small-small.
Because I tend to only use the upper 7 gears on my Rohloff, I don't worry about my min speeds for each range.
But my shift up speeds in 14th gear in each of my ranges are at 14 mph, 20 mph and 35 mph.
Knowing these speed stops me going for 15th gear, most of the times ......
So you need to learn the max-min speeds for each chainring.
Once you know speed and chainring, you should know roughly where you are on the block.
Doing this won't stop you going small-small, but it will help.