Hydraulic hose in between BB and BB shell?

Forums Mountain Bike Forum Hydraulic hose in between BB and BB shell?


This topic contains 4 replies, has 3 voices, and was last updated by  Aaron Chamberlain 1 year ago.

  • Author
  • #232777

    Well So I decided to get rockshox reverb dropper post. In order to install it I removed the water bottle cage, which I never use, and drilled one of the holes a little bigger for the hose. I then pushed the hose down the down tube. Next I removed the BB to help push the hose up the seat tube. Then when I went to put the BB back on I realized the hose was to big to fit in between the BB and the BB shell! So I was wondering if anyone knew how to fix this? Maybe get a different BB with a smaller center sleeve, if so what BB would you recommend? Or maybe I could sand down the section between the the down tube and seat tube, but I don’t know how I would do the sanding.

  • #232778

    This is my current bottom bracket, but 4 years old

  • #232795

    What is your frame made out of? Clearly you’re not afraid to widen holes in the frame, so maybe you could consider drilling a hole in the seat tube instead? This is where internal dropper ports are usually located, though I think if your solution does work out, it could look a lot cleaner.

    I’m sure others will correct me here, and while this isn’t ideal, I will say I’ve run bottom brackets without the shell before (by mistake) and the world did not end. My BB probably wore out a bit prematurely, as the shell exists to keep water out of the frame and the BB itself. While the shell exists to improve durability, it doesn’t affect the performance AFAIK.

  • #232796

    It’s an alloy, I think aluminum. But it’s a hard tail so I don’t know if that would put more stress on a new hole. But I really only do xc riding, so if I were to drill a new hole where in the seat tube would you recommend.

  • #232797

    With the type of BB you have, the sleeve can’t be removed. So unless you want to buy a new crankest that uses an external type BB, you’re stuck. If it were a steel frame, I’d say definitely go ahead and drill a hole in the seat tube, but I’m not as sure about aluminum.

    It would probably be fine and you’ve already voided your warranty anyway…


You must be logged in to reply to this topic.