• Sram shifters shift both up and down with the thumb and I've not tried a front Shimano shifter but at least on the rear Shimano trigger shifter I've used, the paddle to shift up a gear can be pulled with the finger or pushed with the thumb for the same result.

  • Good to know re: SRAM - I’ll investigate. Shimano is a no-go based on trying out my partner’s bike with a front mech… adding work beyond just braking triggers all sorts of interesting aches (lacking a usable index finger means the others have to work harder than they seem to want to in general).

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