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Old 10-28-2011, 09:51 AM   #61
AliBaba
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Quote:
Originally Posted by Airhead Wrangler View Post
YES!! Thanks. That's some really good info. I was surprised that the offset was as small as 25mm. Everyone so far has told me that HPN used roughly the same offset as BMW, but looking at your photos it's obviously not even close.
The offset on my KTM is even smaller.


Quote:
Originally Posted by Airhead Wrangler View Post
Any idea what your spring rate is??
Sorry, the springs are not marked, that's the (main) reason that I haven't ordered softer srings.
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Old 10-28-2011, 10:27 AM   #62
SOLO LOBO
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Just read about another ADVR getting custom wound 0.65 springs from this place:

http://www.sonicsprings.com/catalog/
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Originally Posted by Stagehand
your bike is suitably dirty. Well done.
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Old 10-28-2011, 10:43 AM   #63
Airhead Wrangler OP
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Quote:
Originally Posted by SOLO LOBO View Post
Just read about another ADVR getting custom wound 0.65 springs from this place:

http://www.sonicsprings.com/catalog/
I've seen off the shelf (non-custom) springs available from .36 all the way up to .70 for 4860s.
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R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
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Old 10-30-2011, 09:03 PM   #64
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Quote:
Originally Posted by AntonLargiader View Post
I finally got around to measuring the ones I have.

66mm upper clamp area
137mm gap
91mm lower clamp area
These measurements seem to be consistent for the dirt bike models. However I was missing data on the 950/990 models, but as luck would have it someone on their way south on a 990 adventure is crashing at my house for the next couple days. I measured his forks and got a very different measurement between clamping areas:

65mm upper clamp area
175mm gap
92mm lower clamp area

I used a crappy tape measure and judging by anton's avatar, his numbers for the clamping area lengths are probably better than mine, but the gap between the two is obviously MUCH bigger on the 990 I measured - not sure what year - so much so that they probably wouldn't work on an airhead.
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R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
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Old 10-31-2011, 07:50 AM   #65
Airhead Wrangler OP
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Does anyone have a KTM dirtbike to pull some measurements off of? Could you measure the center to center of the diameter of the hexagonal brake rotor bolt pattern? I'd like to compare them to the pattern from a 990 adventure which uses dual 300mm floating rotors as stock. The 990 rotors use no lateral offset, so if the rotor bolt pattern is the same, I might be able to use a 990 rotor with dirt model forks.
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R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
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Old 10-31-2011, 08:26 AM   #66
AliBaba
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Quote:
Originally Posted by Airhead Wrangler View Post
Does anyone have a KTM dirtbike to pull some measurements off of? Could you measure the center to center of the diameter of the hexagonal brake rotor bolt pattern?
EXC400, 2006, +-2mm:
Straight accross (center to center) 125mm
One hole to the next (center to center): 65mm
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Old 10-31-2011, 08:30 AM   #67
Airhead Wrangler OP
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Quote:
Originally Posted by AliBaba View Post
EXC400, 2006, +-2mm:
Straight accross (center to center) 125mm
One hole to the next (center to center): 65mm
Thanks for that, but DAMN. Not the same as the 990 which is about 143mm. Back to the drawing board. Maybe if I start with a 690 enduro hub. Hmmm...

EDIT: OK, after a bit more checking it looks like the 950/990 adventure, the 950 super enduro, and the 690 enduro all use the larger 143mm rotor bolt pattern. While the 950/990 adventure use the larger 30mm, the super enduro and 690 enduro use the same 26mm axle as the RFS model. I might have to start with a 690 enduro or 950 superenduro front hub. I'll also need a different caliper holder if not an entirely different caliper.

Measurements ripped off of metalgear's website:


Measurements (mm)
Outside Diameter: 300
Inside Diameter: 124
Bolt Hole CTC Diameter: 143
Bolt Hole Qty: 6
Bolt Hole Size: 6.5
Thickness: 5.0
Minimum Thickness: 4.5
Offset: 0.0

Metalgear makes some nice rotors at pretty reasonable prices too:



$189AU
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R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.

Airhead Wrangler screwed with this post 10-31-2011 at 10:21 AM
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Old 11-02-2011, 06:08 AM   #68
aerone
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KTM 950 SM Conversion

I just finished my bike, rode it yesterday. (88GS} Short story, new cnc offset trees using stock SM forks and radial mount brakes. Shortened KTM stem turned down to fit BMW stock bearings. I used both KTM calipers and the stock KTM brake lines. The brakes are great, not too much as on the SM. I used a 16 mm BMW master cylinder and all my stock switchgear and throttle work fine on the KTM fatbars that are mounted in the stock rubber isolators. The stock springs in the 06 USD seem to be about right for me at 190 pounds.

I'm not too good a posting pictures. I will share if one of you send me an email address.

I was inspired by all of these unholy reunion threads and had to take action. Thanks !
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Old 11-02-2011, 08:28 AM   #69
Airhead Wrangler OP
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Quote:
Originally Posted by aerone View Post
I'm not too good a posting pictures. I will share if one of you send me an email address.
Check your PMs.
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R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
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Old 11-02-2011, 01:05 PM   #70
igormortis
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Quote:
Originally Posted by aerone View Post
I just finished my bike, rode it yesterday...I'm not too good a posting pictures. I will share if one of you send me an email address.
Quote:
Originally Posted by Airhead Wrangler View Post
Check your PMs.
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Old 11-03-2011, 09:02 AM   #71
Airhead Wrangler OP
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Quote:
Originally Posted by aerone View Post
I'm not too good a posting pictures. I will share if one of you send me an email address.
Here you go. That's one hell of a big offset in the triples. I guess that's necessary in this application as the SM forks are non-leading axle. Have you shortened the travel at all? If not, it looks like you could bottom out your front wheel in the fender.







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R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
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Old 11-03-2011, 10:19 AM   #72
aerone
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Thick Clamps

That is quite the offset. I left the clamps pretty thick, they are strong enough to set a house on. I have done some real hard braking while testing the rig, no issue yet on tire to fender clearance. I made sure the axle location is real close to stock, the geometry seems to be spot on.
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Old 11-03-2011, 10:41 AM   #73
Airhead Wrangler OP
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Quote:
Originally Posted by aerone View Post
I have done some real hard braking while testing the rig, no issue yet on tire to fender clearance.
I bet. Those brakes look like they'd stop you like a brick wall.
__________________
R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
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Old 11-03-2011, 06:46 PM   #74
Airhead Wrangler OP
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Quote:
Originally Posted by AliBaba View Post
EXC400, 2006, +-2mm:
Straight accross (center to center) 125mm
One hole to the next (center to center): 65mm
Are you sure about this measurement? I had a manufacturer of aftermarket KTM hubs tell me that the front rotor bolt diameter on ALL KTMs 125+ is 143mm. He said that 125mm is the diameter of the rear rotor bolt pattern on a lot of the dirt models.
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R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.
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Old 11-04-2011, 12:32 AM   #75
AliBaba
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Quote:
Originally Posted by Airhead Wrangler View Post
Are you sure about this measurement? I had a manufacturer of aftermarket KTM hubs tell me that the front rotor bolt diameter on ALL KTMs 125+ is 143mm. He said that 125mm is the diameter of the rear rotor bolt pattern on a lot of the dirt models.


Aaarggh, you are right, it is 143 mm. I have a lot of trashed parts and picked a rear one. Sorry.
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