Shimano BH59 brake hose is 5MM OD and 2.3mm ID. The OEM barb daimeter is 2.6mm.
The olives are the same for both.
Saturday, November 29, 2025
Shimano BH90 and BH59 barb sizes
Shimano BH90 brake hose is 5mm OD and 2.1mm ID. The OEM barb diameter is 2.35mm. Aftermarket barb diameters range from 2.31mm to 2.39mm.
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