For Shimano brifters, the flight deck computers have them:
For grip shifters, they can be stamped and painted on the clamp section:
Others?
Like most everyone else I go by feel ... but I probably don't pay as much attention as I ought to, because there are times I'm cross-chaining and don't realize I'm still in the big ring until I hear the noise of the chain complaining, and it can't be good for the shifter cable to keep trying to shift down when I'm already in my lowest gear. I do look down occasionally to see where I am.






, and it can't be good for the shifter cable to keep trying to shift down when I'm already in my lowest gear. I do look down occasionally to see where I am.
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