Problems fitting hope e4 rear brakes on Giant Stance rear

oldskoolg60
oldskoolg60 Posts: 20
edited May 2018 in MTB workshop & tech
Bought some hope e4 brakes and the fronts went on well with the adaptor, the rear however is a nightmare. Once fitted, the caller body touches the rear chain stay triangle, meaning I can't push it any further outboard, which I need to do, so that the disc is in the centre of the caliper. At the moment it's too far over to one side and is rubbing badly. Bike is a giant stance 2016. https://postimg.cc/image/xk21smjqz/
https://postimg.cc/image/erq6p7v4b/

Comments

  • 02gf74
    02gf74 Posts: 1,171
    Ouch, that must be disappointing.

    Other than fitting a larger diameter disc and adapter, which may or may not fix the problem, looks like the calliper is too wide to fit the frame.

    If you are determined to use it, another option is to remove the hub from the wheel and using a lathe, take some metal off the bolt holes, assuming it's not centre lock and there is enough metal left for the bolts.
  • oldskoolg60
    oldskoolg60 Posts: 20
    02GF74 wrote:
    Ouch, that must be disappointing.

    Other than fitting a larger diameter disc and adapter, which may or may not fix the problem, looks like the calliper is too wide to fit the frame.

    If you are determined to use it, another option is to remove the hub from the wheel and using a lathe, take some metal off the bolt holes, assuming it's not centre lock and there is enough metal left for the bolts.

    Yes I did consider that but it would be expensive to unmade and relace the wheel. Might make it a long term project and put the standard brakes back in for now. I reckon a couple of mm off the mounting face of the hub might be doable , could put small nuts on the back with threadlock to secure rotor screws.
  • JBA
    JBA Posts: 2,852
    edited May 2018
    Buy a new bike to fit them to. :wink:
    “Life has been unfaithful
    And it all promised so so much”

    Giant Trance 2 27.5 2016 ¦ Sonder Broken Road 2021¦ Giant Revolt Advanced 2 2019 ¦ Giant Toughtroad SLR 1 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009
  • swod1
    swod1 Posts: 1,639
    assume your using a 160mm disc on the rear?

    that does look tight fit, how much is the disc off centre?
  • oldskoolg60
    oldskoolg60 Posts: 20
    swod1 wrote:
    assume your using a 160mm disc on the rear?

    that does look tight fit, how much is the disc off centre?

    About 2 mm ish, gonna order a new rear hub and machine some off the mounting face..

    New bike if not lol
  • 02gf74
    02gf74 Posts: 1,171
    Fitting 180mm disc with appropriate adapter may sort it, likely to be simplest and cheapest.
  • JGTR
    JGTR Posts: 1,404
    Seat stay curves in towards the top so a larger disc will be an even worse fit surely?
  • oldskoolg60
    oldskoolg60 Posts: 20
    JGTR wrote:
    Seat stay curves in towards the top so a larger disc will be an even worse fit surely?
    That's right mate, hence why new hub needed.
  • JBA
    JBA Posts: 2,852
    That's a lot of hassle and expense to try and fit a brake to a bike, if you don't mind me saying.
    The cost of the brakes the new hub/wheel and getting it machined may be more than the bike is worth.
    “Life has been unfaithful
    And it all promised so so much”

    Giant Trance 2 27.5 2016 ¦ Sonder Broken Road 2021¦ Giant Revolt Advanced 2 2019 ¦ Giant Toughtroad SLR 1 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009
  • oldskoolg60
    oldskoolg60 Posts: 20
    JBA wrote:
    That's a lot of hassle and expense to try and fit a brake to a bike, if you don't mind me saying.
    The cost of the brakes the new hub/wheel and getting it machined may be more than the bike is worth.
    I'll be doing all the work myself so it's going to be a little project, I love these kinds of challenges.
  • 02gf74
    02gf74 Posts: 1,171
    If you have access to a well equipped workshop, an alternative is to modify a disc brake rotor to move the braking surface inwards. For example take a two piece root with alloy carrier from 180 mm and attach a 160mm outer. Machining the hub is the better and safer option imo.
  • oldskoolg60
    oldskoolg60 Posts: 20
    02GF74 wrote:
    If you have access to a well equipped workshop, an alternative is to modify a disc brake rotor to move the braking surface inwards. For example take a two piece root with alloy carrier from 180 mm and attach a 160mm outer. Machining the hub is the better and safer option imo.
    I did think about getting a hope floating disc, then grinding the rivets off and placing a spacer in between rivet and disc but that wouldn't work as the rivet only just clears the pads so putting a space in would foul the inside.

    Some 2nd hand dented rims are on the way and I'll chop the spokes out of that and use the hub which looks in good nick.
    Will update once I've machined it, probably not build the wheel up just yet but put a disc on the machined hub and see if I've sorted it.
  • oldskoolg60
    oldskoolg60 Posts: 20
    So set the hub up in a lathe and machined off, 2.5mm , did a dummy run with disc fitted, still catches, put it back into the lathe, took a bit more off, catches the other side now, no problem I thought, I have adjustment on the slots to bring it back, nope, adjustment is the wrong way ! So I'm going to fit a hope spacer behind the disc, (1mm) which will bring it perfectly in line with the centre of the caliper. Top tip, don't take off too much. Will upload a pic once I get the spacer.

    https://ibb.co/b6fKVd

    https://ibb.co/iy2zVd

    https://ibb.co/hxO6Ad
  • 02gf74
    02gf74 Posts: 1,171
    How annoying, you know what they say, measure twice, cut once.

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