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Old 04-14-2008, 01:29 PM   #1
airheadpilot OP
Le Poulet du Désert
 
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Joined: Dec 2005
Location: near San Francisco
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Disc brakes on /2 Earls Forks

I'm screwing around with a project bike - basically building an airhead entirely from parts. Since it was never a whole bike, I don't feel too obligated to stick to anything that could be described as "original." I had planned on using 1981-1984 forks with heavily modified internals because I'd like to run wire wheels but I want the stopping power of the Brembos. But then I stumbled across a good deal on a straight /2 Earls front end - missing the shocks and the wheel. I love the way my stepdad's R60/2 rides with the Earls fork, and am thinking that might be fun to play around with, but I still want the braking power of dual Brembos. I've seen them in the past so I know it's been done. Anyone out there have good photos of a BMW Earls fork front end modified to run dual calipers? Better yet, has anyone done it and can give me an idea of the level of fabrication required, beyond just welding the tangs for the calipers on the bottom of the swinging arm? Maybe nothing comes of it, but I'm having fun thinking outside of the box.

Thanks!

Andrew
1970 BMW R50/5 project bike
1971 Moto Guzzi V750 Ambassador
1972 BMW R75/5
2000 Honda XR650R dual sport
2003 Suzuki Burgman 400 wife's bike
2005 Yamaha FJR1300A
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Old 04-14-2008, 02:15 PM   #2
SOLO LOBO
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perhaps not the solution you are looking for, but see this?

http://www.bmwgs.com/forums/showthread.php?t=330310
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your bike is suitably dirty. Well done.
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Old 04-14-2008, 03:56 PM   #3
airheadpilot OP
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Actually, that's very helpful. I was thinking of using Brembos from a post-1980 airhead, but it's basically the same idea. What that shows me is that the Earls will fit up to a /5 headstock and that a later wheel (I'm thinking a /6 hub with dual discs) will fit, albeit it with possibly some futzing (technical term) with the axle and bearing preload.

Thanks!

Andrew
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Old 04-14-2008, 06:34 PM   #4
Uncle Ernie
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I've got a single disk on mine, and the wheel just barely fits. You really only need one, but if you're dead set on 2, check these guys out;

http://autos.groups.yahoo.com/group/slash2conversions/
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Old 04-14-2008, 08:45 PM   #5
RocketJ
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Wire and bremo f08s

Quote:
Originally Posted by airheadpilot
Actually, that's very helpful. I was thinking of using Brembos from a post-1980 airhead, but it's basically the same idea. What that shows me is that the Earls will fit up to a /5 headstock and that a later wheel (I'm thinking a /6 hub with dual discs) will fit, albeit it with possibly some futzing (technical term) with the axle and bearing preload.

Thanks!

Andrew
The calipers will hit the spokes, unless you find a rare 100CS wire wheel, some R65(?) hubs or those from a G/S. The /6 and 7 hubs won't work.
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Old 04-15-2008, 05:42 PM   #6
Hennepinboy
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Check with Nathan from Boxerworks

http://boxerworks.com/message.phtml

They have set up for disk on Earls Forks and everything else you may need.
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Old 04-15-2008, 07:32 PM   #7
JohnTM
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Old 10-29-2013, 02:47 PM   #8
Tony Collett
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Quote:
Originally Posted by airheadpilot View Post
Actually, that's very helpful. I was thinking of using Brembos from a post-1980 airhead, but it's basically the same idea. What that shows me is that the Earls will fit up to a /5 headstock and that a later wheel (I'm thinking a /6 hub with dual discs) will fit, albeit it with possibly some futzing (technical term) with the axle and bearing preload.

Thanks!

Andrew
Have just completed doing this Disk Brake conversion. Not that difficult, just not to be rushed. If you need some pointers, I can help as there are many ways to skin this cat. Happy Trails, My email is : tony.collett@shaw.ca
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