R80ST vs. R80 Monoshock Suspension

Discussion in 'Airheads' started by sigpe57, Dec 31, 2012.

  1. sigpe57

    sigpe57 Been here awhile

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    #1
  2. Mark Manley

    Mark Manley Long timer

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    I think an R80RT of that era would have been monolever from new so it has not been converted, the spoked rear wheel will not fit as it has three bolts and the monolever one has four. Apart from the insruments there is not much ST about this bike, it still has twin silencers and the right hand silencer mount is not there on the ST frame which is which another difference.
    This does not mean it is not a capable machine, a friend of mine has done the same to his monolver RT and loves the bike but if you want an ST you will have to buy one as this is nothing like it.
    From what I can recall the only parts that are the same are the engine and gearbox, just about everything else is different.
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  3. squish

    squish Out of the office.

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    Subframe is different
    Three bolt vs four or four vs five rear wheels.
    Shock mount point at the frame is different too. At least the r80 uses the big battery and the st uses the smaller one.

    I've got one of each in the stable.
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  4. Airhead Wrangler

    Airhead Wrangler Long timer

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    Squish mentioned the upper shock mount being different, but the lower one is also different. The shock mounts to the swingarm on the ST (same swingarm as G/S) whereas it mounts to the the final drive on the later mono models.
    #4
  5. mark1305

    mark1305 Old Enough To Know Better

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    Also, the ST frame is based on the R65 monolever frame with a few little changes. (that's why R65 gas tanks will fit the ST and G/Ss)
    #5
  6. squish

    squish Out of the office.

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    Funny I though the Mono R65 was the same frame as the Mono R80 and the ST was the same frame as the G/S...
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  7. Airhead Wrangler

    Airhead Wrangler Long timer

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    The ST IS the same frame as the G/S. The mono R65 didn't exist when the G/S and ST came out.
    #7
  8. mark1305

    mark1305 Old Enough To Know Better

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    Oops, I stand corrected on the R65 mono part. I had mis-remembered the description in Zimmerman's BMW Motorcycle Buyers Guide where he describes the origins of the G/S then the creation of the ST as a street version with forks and frame similar to the R 65 with the use of the mono rear end on the ST.
    #8