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All I can find is expensive or really cheap (mystery brand) is there a particular model I should look for?
@Scilly.Suffolk I think you may be onto something but gf is not convinced... Having ridden hire bikes with grip shifts she is pretty convinced the within reach from her grips is ideal.
I remember having thumbies on a mtb as a kid and didn't think they were too awkward, they were indexed though...
Would old Shimano 6 speed thumbies work with the indexing on the right hand & campag rear mech, could just run friction for front of course... I don't understand all the different pull ratios etc or when they came about.
Cheap and reliable define thumbshifters.
That said, just get the cheapest shimano one that works.