r80st front break caliper questions

Discussion in 'Airheads' started by lochridge, Oct 9, 2012.

  1. lochridge

    lochridge Been here awhile

    Joined:
    Apr 17, 2007
    Oddometer:
    152
    Location:
    here
    i noticed a thread last week (i think) where a guy had a picture posted of his r80st that has two front calipers.
    i would seriously like to do that to mine. is there a certain part number that i would need to look for, for the left side caliper?
    also what else would need to be modified.......thinking spacers or whatnot.
    from my understanding the g/s and st calipers are different.
    #1
  2. Mark Manley

    Mark Manley Long timer

    Joined:
    Apr 3, 2010
    Oddometer:
    1,104
    Location:
    Back home in the UK
    I have a G/S which I have fitted twin discs and a friend has an S/T which he has done and they are the same parts. It was a while ago but from what I can remember the wider spacer has to be remade 5.5 mm longer, in theory you need to replace the 12mm diameter master cylinder with a 16mm one but in practice if the 12 is in good condition it will do the job, we have both used stainless steel hoses. The extra calipers and discs were bought second hand from a breakers.
    #2
  3. lochridge

    lochridge Been here awhile

    Joined:
    Apr 17, 2007
    Oddometer:
    152
    Location:
    here
    i have a stainless line on there now, it is only about 2 years old.
    i did not know about the larger master cylinder though. where can you get one of those?
    since i ride in traffic everyday around here, i have people pull out in front of me all the time, and i would just like to have a little better stopping power for when i need it.
    thank you
    #3
  4. Clay Spinner

    Clay Spinner Been here awhile

    Joined:
    Nov 6, 2008
    Oddometer:
    758
    Location:
    Nova Scotia
    lochridge... don't bother with the twin disc set up (IMO), you'll be better off getting a front caliper from a r1100 GS (or whatever uses the same one), milling off the tabs a bit (0.158 inch) and using that. I have this setup on mine and it is like having real brakes on the bike. I expect it will be cheaper and lighter than a double disc. once the calliper is milled... its a bolt on bolt off job.
    #4
  5. desmo

    desmo Been here awhile

    Joined:
    Mar 30, 2002
    Oddometer:
    238
    Location:
    South Florida
    #5