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Old 06-20-2013, 11:09 AM   #61
Ras Thurlo
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what are you thinking in terms of shock set up? going vertical or diagonal?

if you are going for an airhead bevel box, can you mount the shock in standard 100GS mounting points - but with a monster long shock?


[IMG][/IMG]
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Old 06-20-2013, 12:21 PM   #62
Prutser
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Last weekend some German HPN owner told me they charge 3000 for there swing arm.
He also told me that with the 1100 or 1150 swing 250mm wheel travel was the max. But if you would like to have more you would have to use there swing arm.
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Old 06-20-2013, 12:38 PM   #63
Chuck U Farley
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Quote:
Originally Posted by Airhead Wrangler View Post
...and a new project begins.





Just to dispell another internet myth: An R1100GS swingarm is neither 20mm narrower than nor the same width as a R100GS swingarm. I've heard mention of both being the case. I couldn't get a super-precise width on the R100GS swingarm, but it's just about exactly 10mm wider. An 1100 swingarm is 254mm wide.
Airhead Wrangler, I'm going to be following your progress closely as I'm about to embark on the same project. I have the 1100 swingarm, driveshaft, diff etc as well as the coupler to connect to the airhead output shaft. I understand that there is an offset issue to deal with on the rear wheel.

Keep us updated on your progress.
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Old 06-20-2013, 01:06 PM   #64
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Quote:
Originally Posted by Prutser View Post
He also told me that with the 1100 or 1150 swing 250mm wheel travel was the max. But if you would like to have more you would have to use there swing arm.

Have a look at page 13 of their pricelist. They list the various specs of their swingarm options and their own welded swingarm has the same travel as a 1100 swingarm. I think the greatest limiting factor is the angles that the driveshaft can take so the swingarm itself isn't the limiting factor for travel.

http://hpn.de/english/pdfs/Katalog_01_09_engl.pdf

Just look at this monster:

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Old 06-20-2013, 01:44 PM   #65
Prutser
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Quote:
Originally Posted by Airhead Wrangler View Post
Have a look at page 13 of their pricelist. They list the various specs of their swingarm options and their own welded swingarm has the same travel as a 1100 swingarm. I think the greatest limiting factor is the angles that the driveshaft can take so the swingarm itself isn't the limiting factor for travel.

Just look at this monster:
I didn't even check there price list yet. That what I just told was info I got from a guy I spoke to on the Touratech travel event I went to last weekend.

I think the restriction is not the drive shaft but the max angle the final drive can make in the stock 1100 or 1150 swing arm.
The final drive touches the inside of the swing arm on min and max wheel travel.

Their swing arm looks like a monster indeed
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Old 07-30-2013, 07:05 AM   #66
Ras Thurlo
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still para-curious

at the risk of asking a stupid question:

could you fit a R1200 swing arm onto an airhead?

if its good enough for a HP2, could work well on an 'HPN'

Ras Thurlo screwed with this post 07-30-2013 at 02:09 PM
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Old 08-02-2013, 02:08 AM   #67
Ras Thurlo
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bump

is this possible?

I know nothing about oil/hex heads, but was para-curious why this had never come up for discussion


Quote:
Originally Posted by Ras Thurlo View Post
at the risk of asking a stupid question:

could you fit a R1200 swing arm onto an airhead?

if its good enough for a HP2, could work well on an 'HPN'
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Old 08-02-2013, 02:16 AM   #68
Rob Farmer
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The 1100 Swinging arm fits straight into a mono frame but is a different width to the paralever swinging arm. You have to weld a small spacer to the left hand side of the paralever frame to take up the slack. and then tap through with a 20mm 1.5 tap to keep the support for the swinging arm pivot.

The offset on the rear wheel is approximately 20mm which is where the 20mm figure mentioned above comes from.

I was putting this together a couple of years ago. You can see the offset using unmodified standard parts. The 1100 swinging arm is considerably longer than the standard paralever one. If you fit the 1150 swinging arm it's only slightly longer than the paralever setup.

Getting the wheel pulled into line is the hardest part, everything else is pretty straight forward and deceptively easy. Though you will need to make a decent bracket for the top shock mount. You end up with a very high machine that I thought was very unwieldy. I sat on one of the bikes crazy Ivan had built and it made my 1150 GSA feel like a toy which defeated the object of having an airhead. You may as well run a stripped down 1100GS




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Old 08-02-2013, 02:29 AM   #69
Ras Thurlo
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Quote:
Originally Posted by Rob Farmer View Post
The 1100 Swinging arm fits straight into a mono frame but is a different width to the paralever swinging arm.
was asking about mounting one of these 1200 bad boys onto an airhead. Had just never seen this come up as a topic, maybe for good reason...

[IMG] photo r1200swingarm_zps32266d9a.jpg[/IMG]

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Old 08-02-2013, 02:43 AM   #70
Rob Farmer
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I'd have though it was possible Ras and would like to see it done. The 1200 final drive is it's biggest weakness though so availability of second hand ones may have put people off before.
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Old 08-02-2013, 06:36 AM   #71
CrazyIvan
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Quote:
Originally Posted by Ras Thurlo View Post
was asking about mounting one of these 1200 bad boys onto an airhead. Had just never seen this come up as a topic, maybe for good reason...
A few reasons:
  • The swingarm bolts are not in the center of the gearbox anymore, but offset.
  • The final drives are more likely to fail, where the 11XX ones are basically the same design as the paralever ones. (bearing wise).
  • There's also only very tall gear ratio's with the 1200 final drives. The R850's and early R1100RS bikes have got the same ratio as the R80GS and R100GS.

BTW, Increasing suspension travel and keeping the bike the same height is also very difficult...
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Old 08-26-2013, 03:21 AM   #72
Chuck U Farley
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Here's mine finished, with the 1100 rear end.......



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Old 08-26-2013, 08:02 AM   #73
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Quote:
Originally Posted by CrazyIvan View Post
BTW, Increasing suspension travel and keeping the bike the same height is also very difficult...
Especially if you want to keep ground clearance when fully compressed. Can you tell me what length and stroke you used for your shock? Have you measured how much travel you get on the rear?
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Old 08-26-2013, 08:57 AM   #74
Ras Thurlo
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Quote:
Originally Posted by Airhead Wrangler View Post
Have you measured how much travel you get on the rear?



+ is there any appreciable difference in seat height on an airhead between using an extended monolever (+100mm) and a 1100 para lever?

wheel base should be a bit longer for the 1100 swing arm, but dont know about ride height

Ras Thurlo screwed with this post 08-26-2013 at 09:07 AM
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Old 08-26-2013, 12:37 PM   #75
Dmaster
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Quote:
Originally Posted by Airhead Wrangler View Post
Have you measured how much travel you get on the rear?
I've been into this lately.
I came to this conclusion:
If you keep the torque arm setup stock (use the R100GS mount) you can get 260mm MAX.
Real wheel travel, 0 from ground to 260 from ground.

If you fuck around with the torque arm setup you can get over 300mm, but you'll have the "jacking" back
If you fuck it up a bit different i think you can get 285mm wheel travel with the no jacking system still working.
But i did not tested this setup yet, so it may be bullshit .
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