Author Topic: Hydraulic Brake Hose Diameters and Interoperability  (Read 94 times)


  • Member
  • *
  • Posts: 38
    • View Profile
Hydraulic Brake Hose Diameters and Interoperability
« on: January 17, 2018, 10:29:37 AM »
I'm looking to buy some bulk hydraulic hoses to keep in my home workshop, and I can't seem to find a clear answer on hose interoperability.

Currently, I have Shimano XT BR-M8000, Shimano RS785, Formula R1, and Guide RSC hydraulic brakes. In short, my question is: do all of these brakes share the same hydraulic hoses?

I believe the answer is yes as long as the inserts are correct.

The "universal" hose in most cases has an outer diameter (OD) of 5.0mm and internal diameter (ID) of 2.1mm

The XT's use the BH90 hose, which has an OD of 5.0mm and ID of 2.1mm.

The RS785s use the BH59 hose with OD 5.0mm and 2.5mm ID (I think? can't find this answer, just know it's slightly larger than the BH90), however many have reported using the BH90s without issue.

The only deviation I can find are Tektro and Hayes brakes that use hoses with 5.5mm OD and 2.5mm ID.