Shimano Ultegra Hydraulic Brakes Compatible With Shimano MTB Lines???
Results 1 to 5 of 5
  1. #1
    RoadBikeReview Member
    Reputation:
    Join Date
    Sep 2020
    Posts
    3

    Shimano Ultegra Hydraulic Brakes Compatible With Shimano MTB Lines???

    I'm disassembling one bike with Ultegra Di2/hydraulic and building another, going from post mount Shimano calipers to flat mount Ultegra calipers, keeping the levers. Ive bled a bunch of MTB stuff, not road but I have the tools. My real question is I need a longer rear hydraulic line and have a long Shimano line from an MTB with a banjo bold on it. It looks like I can just cut off the banjo bolt and insert the brass fitting and it will work, is that a safe assumption to make?

  2. #2
    'brifter' is f'ing stupid
    Reputation: cxwrench's Avatar
    Join Date
    Nov 2004
    Posts
    15,236
    Sounds reasonable. Make sure you use the right fittings, Shimano has 2 types...1 has the silver barb, the other is brass. Both use brass olives. There are also 2 types of brake hose, you can check the Shimano site to confirm what you have and which fittings to use.
    #promechaniclife

  3. #3
    RoadBikeReview Member
    Reputation:
    Join Date
    Sep 2020
    Posts
    3
    Good to know, I did a little more research, I actually have ST-R785 levers which are Alfine not Ultegra, my derailleur is Ultegra. The user manual on the Shimano site doesn't say anything about what type of hydraulic line or olive/insert to use, where do you get that info? I have BH90 olives/inserts, which I think are what the Ultegra R8000 use. I just need to double check the housing I have because it's new old stock MTB with SM-BH63 stamped on it. I'm going to re-use the the rear line on the front brake so I know it will fit, I just need to figure out this MTB one and if it's compatible.

  4. #4
    RoadBikeReview Member
    Reputation:
    Join Date
    Dec 2009
    Posts
    46
    Do you know what the part numbers for the current and new calipers are? As far as the hoses go, Shimano currently uses SM-BH59 and SM-BH90. The BH63 is an older hose. I don't know its exact differences, so I can't really compare it to the two current hoses. The BH59 and BH90 have slightly different internal diameters, so it is important to use the proper one for the lever/caliper that you're using. si.shimano.com lets you look up a ton of good tech info and also takes you to the spec/compatibility site at productinfo.shimano.com

    So long story short, I wouldn't recommend using that older BH63 hose for this project. The ST-R785 levers use the BH90 hose, so as long as your new calipers require that as well, then grab yourself a new pack of BH90.

  5. #5
    RoadBikeReview Member
    Reputation:
    Join Date
    Sep 2020
    Posts
    3
    Quote Originally Posted by omgBikes View Post
    Do you know what the part numbers for the current and new calipers are?
    They are the Ultegra BR-R8070 F and matching rear calipers. OK I already assembled and bled everything - it seems to be working just fine but I haven't ridden it yet. If I can track down a newer hose then I can swap it in pretty easy. Thanks for pointing me to the si.shimano.com site - that would have come in handy!

Similar Threads

  1. Hydraulic Brake Lines and Palm Discomfort
    By TiCoyote in forum Components, Wrenching
    Replies: 8
    Last Post: 01-28-2020, 08:43 AM
  2. Shimano Hydraulic ST-RS685 or Sram Hydraulic
    By Kuna in forum Cyclocross
    Replies: 16
    Last Post: 07-24-2015, 05:43 AM
  3. Replies: 4
    Last Post: 06-29-2014, 07:40 PM
  4. Hydraulic brake lines
    By Cinelli 82220 in forum Components, Wrenching
    Replies: 2
    Last Post: 02-18-2012, 06:44 PM
  5. Replies: 3
    Last Post: 11-07-2009, 11:13 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

THE SITE

ABOUT ROADBIKEREVIEW

VISIT US AT

© Copyright 2020 VerticalScope Inc. All rights reserved.