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Old 09-25-2014, 03:56 PM   #1
Jim K in PA OP
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Car wheel with rear drum brake on a BMW airhead

Has anybody seen or done a rear car wheel conversion on an airhead BMW with a drum brake? Would love to see pictures, especially of the drum. Is there a car or trailer brake drum compatible with the BMW brake shoes?

I am imagining an adapter machined to mate the wheel (Centerline 15x3.5) with a brake drum, rear spline cup, bearings, and drilled for the axle.

Easier option would be to convert to a rear disk and mount the rotor to the adapter, rather than a drum.

Weighing options on what to do with Olga's wheels. Opinions welcome.
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Old 09-26-2014, 04:55 AM   #2
Bobmws
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Had to look back at your thread to see the rear wheel as it is. I envision clearance issues installing / removing a wheel with the car tire in that two sided swingarm.
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Old 09-26-2014, 07:33 AM   #3
Jim K in PA OP
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Legitimate point, Bob. Unless the drum is centered within the wheel, it won't even go IN the swingarm. Conversion to rear disk looks like the only option for what I am envisioning. The disk hat & rotor would mount on the left side of the whee, partially within the dish.

If I go this route, I'll sketch something up and perhaps turn a test adapter out of wood to confirm the design. I can't turn the adapter itself as I do not have a metal working lathe.
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Old 09-26-2014, 02:05 PM   #4
hack2004
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Car tire on reart wheel with drum break

I have had a 135 15 r Michelin on my 1975 R9100/6 ural rig for over thirty years. The rim has heavy duty stainless spokes and drum brake and clears the swing arm with a bit of body language . Chris at Boxermetal mounted new stainless car rims and spokes in 2013 for me,
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Old 09-26-2014, 02:06 PM   #5
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Car tire on reart wheel with drum break

I have had a 135 15 r Michelin on my 1975 R9100/6 ural rig for over thirty years. The rim has heavy duty stainless spokes and clears the swing arm with a bit of body language.
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Old 09-26-2014, 02:34 PM   #6
Jim K in PA OP
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Ok - I guess I was not clear on what I was asking about. I was not talking about adapting a wheel and car tire to my spoke hub. I have that now. I am considering going to a disk wheel like the Centerline I mentioned. My rear wheel needs to be rebuilt/re-spoked, so am looking at all options.

Hack2004 - gorgeous rig. I am impressed that you have a 135 in there. My 125 just barely clears the swing arm as it sits. My swing arm was already narrowed and plated at the fat part of the tire radius for clearance.

I also see that you have Brembos on the front, with what appear to be non-BMW rotors on adapters. What are the rotors from?

Thanks for the input.
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Old 09-26-2014, 06:16 PM   #7
hack2004
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Ca tire on airhead rear

Front rotors are rcb on my original /6 front hub
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Old 09-27-2014, 10:10 AM   #8
whitham_wannabe
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Something like this?

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Old 09-27-2014, 12:04 PM   #9
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Quote:
Originally Posted by whitham_wannabe View Post
Something like this?
VERY interesting! Can you share some details? It looks like the original hub was somehow was mounted to the centerline disk wheel.



Is that Chris' old rig?
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1975 BMW R90S Hack - Olga - Olga's story - adopted 3/22/14
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Old 09-27-2014, 12:10 PM   #10
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Quote:
Originally Posted by hack2004 View Post
Front rotors are rcb on my original /6 front hub


Sorry - rcb?
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Old 09-27-2014, 08:29 PM   #11
hack2004
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Rear car ti

EBC rotors
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Old 09-27-2014, 08:54 PM   #12
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Link to gs rig build etc

http://www.expeditionportal.com/foru...idecar-Rig-EML

I think it was built by that cat Chris (530.520.7856) out on the west coast............BOXERMETAL........but I am not sure...........If you join expeditionportal.com you should be able to track down whoever did the centerline drum brake conversion definitively...........Good luck and show us what you find!........I have a GSPD Replica which I may want to do something similar to down the road.....just gotta payoff a few other projects first

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Old 09-27-2014, 09:51 PM   #13
Jim K in PA OP
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Quote:
Originally Posted by hack2004 View Post
EBC rotors
Ah - what application? Were they spaced out from the stock hub to allow the calipers to clear the spokes?
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1979 BMW R100T - Otto - Returned to the road - 5/12/11
1975 BMW R90S Hack - Olga - Olga's story - adopted 3/22/14
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Old 09-27-2014, 09:53 PM   #14
Jim K in PA OP
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Quote:
Originally Posted by SLACKER View Post
http://www.expeditionportal.com/foru...idecar-Rig-EML

I think it was built by that cat Chris (530.520.7856) out on the west coast............BOXERMETAL........but I am not sure...........If you join expeditionportal.com you should be able to track down whoever did the centerline drum brake conversion definitively...........Good luck and show us what you find!........I have a GSPD Replica which I may want to do something similar to down the road.....just gotta payoff a few other projects first
Yep - thought so. I've been on expo portal for years. Thanks for the reminder/confirmation.
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1975 BMW R90S Hack - Olga - Olga's story - adopted 3/22/14
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Old 09-29-2014, 07:51 AM   #15
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Yup, Boxer Metal Chris' build. I can take some photos if you like, but his build photos linked above will probably give more insight.

But ... if you have the skills and the desire, it can be done!
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