R80ST vs. R80 Monoshock Suspension

sigpe57 · 12-31-2012, 09:52 PM

Just saw this ad on ebay. Just wondering.

The owner converted an '86 R80 to a R80ST look-a-like.

http://cgi.ebay.com/ebaymotors/1986-...item2ec4bd0dce

Are the frame and suspension setup the same between R80 monoshock and R80ST? Are parts interchangeable between these 2 bikes? Can you put an R80 monoshock rear wheel on a R80ST?

Thank you for the reply,

TT

Mark Manley · 12-31-2012, 10:18 PM

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.

squish · 01-01-2013, 01:42 AM

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.

Airhead Wrangler · 01-01-2013, 07:05 AM

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.

mark1305 · 01-02-2013, 04:58 PM

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)

squish · 01-02-2013, 05:14 PM

Quote:

Originally Posted by mark1305

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)

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...

Airhead Wrangler · 01-02-2013, 06:37 PM

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

mark1305 · 01-04-2013, 12:57 PM

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.

12-31-2012, 09:52 PM	#1
sigpe57 ^OP Gnarly Adventurer Joined: Oct 2005 Oddometer: 227	R80ST vs. R80 Monoshock Suspension Just saw this ad on ebay. Just wondering. The owner converted an '86 R80 to a R80ST look-a-like. http://cgi.ebay.com/ebaymotors/1986-...item2ec4bd0dce Are the frame and suspension setup the same between R80 monoshock and R80ST? Are parts interchangeable between these 2 bikes? Can you put an R80 monoshock rear wheel on a R80ST? Thank you for the reply, TT

12-31-2012, 10:18 PM	#2
Mark Manley Somewhere else Joined: Apr 2010 Location: Heading East Oddometer: 368	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. __________________ If it's in the Touratech catalogue then you don't need it No man is an island, except for the Isle of Man Mark Manley screwed with this post 12-31-2012 at 11:24 PM Reason: more info

01-01-2013, 01:42 AM	#3
squish Out of the office. Joined: Dec 2003 Location: Where the Ghetto meets the sea. Oddometer: 4,947	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. __________________ *On vacation for a spell*

01-01-2013, 07:05 AM	#4
Airhead Wrangler More tacos than you Joined: Mar 2008 Location: Manzanillo MX, occasionally Seattle Oddometer: 5,094	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. __________________ R80ST Gets The HPN Treatment Ducati Pantah 500SL Rebuild Seattle to TDF on an airhead WTB R100R Mystic sidestand and mount.

01-02-2013, 04:58 PM	#5
mark1305 Old Enough To Know Better Joined: Feb 2005 Location: Merritt Island, FL Oddometer: 5,516	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) __________________ Mark J Merritt Island, FL When a person asks you for advice, they don't want advice. They want corroboration.

01-02-2013, 06:37 PM	#7
Airhead Wrangler More tacos than you Joined: Mar 2008 Location: Manzanillo MX, occasionally Seattle Oddometer: 5,094	The ST IS the same frame as the G/S. The mono R65 didn't exist when the G/S and ST came out. __________________ R80ST Gets The HPN Treatment Ducati Pantah 500SL Rebuild Seattle to TDF on an airhead WTB R100R Mystic sidestand and mount.

01-04-2013, 12:57 PM	#8
mark1305 Old Enough To Know Better Joined: Feb 2005 Location: Merritt Island, FL Oddometer: 5,516	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. __________________ Mark J Merritt Island, FL When a person asks you for advice, they don't want advice. They want corroboration.

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