Different tier calipers needing different fittings, so you cannot always reuse the hose. Think deore vs. Slx
BH90 and BH59 are cross compatible, you just need to make sure you use the correct barbs
Not strictly Shimano true but seems to be so in practice.
I guess I missed the "without modification" part of the sentence.
@B0N0R started
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Different tier calipers needing different fittings, so you cannot always reuse the hose. Think deore vs. Slx