(edit are you referring to yourself being 5'1 or your sister?)
My sister.
For her bike its a toss up between;
quality double road cranks, like 90's shimano 600/DA or even modern ext BB ones if we are lucky. They are all available in 165mm at the smallest.
But spa cycles have decent looking triple chainset in 160mm for only £35.
Definitely not getting 170mm for her (seeing as they even feel big for me at 5'8")
@DFP started
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My sister.
For her bike its a toss up between;
quality double road cranks, like 90's shimano 600/DA or even modern ext BB ones if we are lucky. They are all available in 165mm at the smallest.
But spa cycles have decent looking triple chainset in 160mm for only £35.
Definitely not getting 170mm for her (seeing as they even feel big for me at 5'8")