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Thread: R80rt

  1. #1
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    R80rt

    What was the first year a rear disc brake was available on this RT?
    Was it available on the 800?

    Thanks
    Will

  2. #2
    Phil B bullfrog_28560's Avatar
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    Looking at the fiche, there were no R80s with rear disc, if there were I would be adding it as I did for the dual front brakes. I do not think there would be an easy way to add rear disc brakes, if someone know please let me know as well.
    Phil Bouffard
    SSG U.S. Army
    Kaiserslautern, Germany

  3. #3
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    You could add a rear disc brake to an R80 as long as the mie is pre-monolever. Most people have found that the rear disc doesn't work as well as the drum.

  4. #4
    Registered User toooldtocare's Avatar
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    Quote Originally Posted by lostboy View Post
    You could add a rear disc brake to an R80 as long as the mie is pre-monolever. Most people have found that the rear disc doesn't work as well as the drum.
    I will second that from personal experience. The disc is too touchy, too easy to lock up in a panic.

  5. #5
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    R80rt

    I wanted to know of a rear disc was offered on the R80RT, and if so what year ?

    Thanks
    Will

  6. #6
    Grammarian no, Rider yes ISAMEMON's Avatar
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    as far as I know it was not available on an r80rt. I have never seen one on an r80, nor have I seen one looking up parts for R80's.I believe It was only available on the R100's
    however I have seen calipers and brackets listed on fleabay to fit the R80rt's
    but I would not trust that
    Ive been wrong before, and will be again

  7. #7
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    Quote Originally Posted by libwwv View Post
    I wanted to know of a rear disc was offered on the R80RT, and if so what year ?

    Thanks
    Will
    Never in the USA. It could be fitted on the '83 or '84.

  8. #8
    RD'nNH&AZ rdhudson's Avatar
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    Nope

    I have an R80RT -1983 with twin front disks and drum back. I have never seen an R80RT with rear disk. I can slide the rear easily with my drum in situations that are not panicked and the front will not slide with out a death grip. I know you didn't ask but I wouldn't do it.
    2002 F650GS, 1998 R1100R 75th anniversary edition, 1983 R80RT (just sold), 1959 R60 (in restoration), Honda CT90
    If you must make a mistake, make a new one each time.

  9. #9
    Phil B bullfrog_28560's Avatar
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    No disc in EURO spec

    I own a 86 R80 Euro Spec, I purchased here in Germany and only the 3rd owner. I have ridden with others who had 90's R80s and still no rear disc, As said in my first post, look at the fiche, no rear disc on R80s.
    Phil Bouffard
    SSG U.S. Army
    Kaiserslautern, Germany

  10. #10
    Registered User lkchris's Avatar
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    Quote Originally Posted by bullfrog_28560 View Post
    Looking at the fiche, there were no R80s with rear disc, if there were I would be adding it as I did for the dual front brakes. I do not think there would be an easy way to add rear disc brakes, if someone know please let me know as well.
    Well, all the R100 parts will bolt right on. But, this means

    • new rear wheel
    • add a rear master cylinder and whatever linkage from the pedal to the master cylinder.
    • add the carrier plate for the caliper (with torque arm) as well as the caliper and of course hose to master cylinder
    • Plug the hole for brake actuater in rear drive as well as remove all brake shoe mounting parts--it might be easier to just substitute a complete R100 rear drive, but you won't find one with the same gear ratio as your R80


    It's quite obvious this is almost completely impractical and I'd advise lots of R100 owners with rear disc brake wish they had a rear drum brake instead. All there really is is the "psychological" feeling you have a more modern system when you have the disc. In reality you have a downgrade as maintenance is severely compromised and the disc works absolutely ZERO better than the drum.
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

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