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Anyone know if, with ht2 cranks of the same model (let’s say Ultegra 6600), is the chainline for the outer most chainring position the same on double and triple cranks or does it change?
It changes. The big ring on the triple is further out.
Also I feel like the triples are 130bcd for the two outer ring positions right?
Yes.
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Here are some numbers for fc 6700 which confirm what Brommers said. They are from a shimano frame specification manual that I can't find at the moment.
Brommers
svenhöek
@M_V
Anyone know if, with ht2 cranks of the same model (let’s say Ultegra 6600), is the chainline for the outer most chainring position the same on double and triple cranks or does it change?
Also I feel like the triples are 130bcd for the two outer ring positions right?