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Old 01-22-2013, 10:25 AM   #16
Other Bob
Gnarly Adventurer
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Joined: Nov 2005
Location: Detroit 'burbs
Oddometer: 450
Photorider & Bpeckm,

Here is the '86-'96 R100GS 6.3gal tank mounted on my '85 R80-mono:

That is the stock R80-mono seat, which I think has a very similar profile to the seat on your bike now. Nice fit, not perfect like AW mentions (small gap at bottom), but not bad either. It's not very noticable with a black tank/black seat and could probably be reduced or eliminated with a spacer under the rear tank mount area, but it just wasn't enough of an issue for me:

It's narrower than the 8.5gal R80GS tank, too. With the handlebars at full stop it's inside the jugs/grip, so a slide on solid ground would probably not result in a scuffed tank:

I hope that helps with your decision Photorider. You might also consider the stock '85-'87 R80-mono 5gal tank:

I'm happy witht he 6.3gal tank, but a little more range would be nice and I like the aethetics of the 8.5gal tank, too.

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Old 01-22-2013, 12:07 PM   #17
Yeah, right!
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Joined: May 2003
Location: Rapaura
Oddometer: 4,702
Here are a few options.

What you have:

What it came with:

What I use on most of my rides:

I found the PD tank to be too big for what I need. I have no need for a 500km range. It's easier to damage in a tip over and a I do a lot of those. But what clinched it is that the large tank does not fit me. It make my knees splay out.

The small dent in the R100GS (400km range, bottom picture) was from my left knee.
R80GS Basic
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Old 01-22-2013, 01:20 PM   #18
Ras Thurlo
Desert Lion
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Joined: Aug 2010
Location: Hillcountry, Italy
Oddometer: 686
Originally Posted by Kokopelli View Post
Here are a few options.

i respect the tank quiver
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Old 01-22-2013, 02:53 PM   #19
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Joined: Apr 2008
Location: Road Island
Oddometer: 5,946
Nice "selection", good to be able to see an apple-apple comparison! Would love to see a classic R80 tank mounted on the ST or G/S!!

XS650 becomes a VT BackRoadRunner
Loving the 80ST
I love projects that take twice as much effort as should be needed. Should be an Airhead motto. (disston)
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Old 01-22-2013, 03:04 PM   #20
One Less Harley
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Joined: Nov 2006
Location: Bowling Green, Ky
Oddometer: 4,828
R100GS tank closeup, note loop was cut off tank- this will be your easiest tank to find. Buy one already dented so you wont care about putting a knee into it.

course if you want to make it look similar to the original--

If not then maybe this-

HPN fit, but a costly option-

stock G/S tank-

2004 BMW R1150RS
1984 BMW R80G/S
(wrenching index)
2003 Suzuki DRZ 400S (TAT Prep)
One More DRZ does the TAT (Ride Report)

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