That's brilliant, thank you all for your help. I'll work out in due course whether I'm cultured, a pleb or an idiot!
Her current shifter is a Shimano EZ Fire Plus with a Tourney mech and she only needs the front triple. Very much low budget to test the water and see how she gets on with MTBing.
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Does 'halfpipe' mean you have a longer length of grip to twist? From what I've found so far, Shimano's offering seems to be intended to operate with thumb and forefinger only. As her thumb is the issue, I would think the longer grip area would be better .... or do they mean, you only need the thumb/forefinger wrapped around the grip to operate it? As you can see - I know
nothing!
When you say Gripshifters take a bit of getting used to, is that because they feel weird compared to thumbshifters or are they just a bit ... odd?
What are 'chucky thumbshifters'? Google throws up some interesting results!