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Thread: Spoked Rear Wheel, Disc Brake

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    Spoked Rear Wheel, Disc Brake

    I want to convert my 78 R100S from rear drum to a disc brake. I have all the parts I need, but I can not find a spoke wheel with a disc brake hub???? All there is are snowflakes. Are they THAT rare?

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    Administrator 20774's Avatar
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    Didn't the early R100RS come with spokes? Assuming it had a rear disk, then they might be pretty rare.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

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    Sir Darby Darryl Cainey's Avatar
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    Quote Originally Posted by 20774 View Post
    Didn't the early R100RS come with spokes? Assuming it had a rear disk, then they might be pretty rare.
    No, all the R100RSs with spokes had drum brakes, only the ones with snowflakes had the option of drum or disc
    brakes.
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    How about the S? I know there was a 1978 R100S with a rear disc. What wheel did that have?

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    Sir Darby Darryl Cainey's Avatar
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    Quote Originally Posted by EMSimon View Post
    How about the S? I know there was a 1978 R100S with a rear disc. What wheel did that have?
    The same, the only difference is the handelbars & faring.
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    Does that mean, I cannot get a spoke rear wheel with a disk brake? I have to get one made?

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    Sir Darby Darryl Cainey's Avatar
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    Why are you trying to reinvent the wheel> pun!

    Not saying it couldn't be done, why don't you just get a pair of Snowflakes with a rear disc.
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    Quote Originally Posted by Darryl Cainey View Post
    Why are you trying to reinvent the wheel> pun!

    Not saying it couldn't be done, why don't you just get a pair of Snowflakes with a rear disc.
    I don't like the looks of the Snowflakes and I hear all these horror stories about them having flaws.

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    Administrator 20774's Avatar
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    Quote Originally Posted by EMSimon View Post
    I hear all these horror stories about them having flaws.
    Only the ones that haven't been taken out of service for the recall. Other than that, they should be fine.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

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    Quote Originally Posted by 20774 View Post
    Only the ones that haven't been taken out of service for the recall. Other than that, they should be fine.
    I wouldn't know how to tell black from white. But the main issue is really the looks. The Snowflake wheels to me are an 80s BMW. A 70s Airhead needs to have spoke wheels. Especially a R100S.
    I don't think Snowflakes would look good on a R90S either.

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    You might consider calling Woody's Wheelworks and discuss the situation with them. I wonder if you had a rim and hub, could the wheel be respoked with enough offset to allow the use of a disk brake. I suspect some engineering will be needed on the frame side to mount the caliper as well as the master cylinder.

    It's sounding like this combination never existed in production...maybe for a reason...maybe not. But worth a question to some wheel experts.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

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    Quote Originally Posted by EMSimon View Post
    How about the S? I know there was a 1978 R100S with a rear disc. What wheel did that have?
    Disc on snowflakes only, or aftermarkets (Lesters, etc.)

    Why do you want the disc rather than a drum? If you're looking for the spokes to give that "period authenticity/appearance", i would think that a drum set-up would enhance that look, not detract from it. No?
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    You may need to have a hub custom built

    I don't think your going to find a OEM BMW spoked rear wheel or hub to fit your bike that mounts a disc brake, I don't think they made them OEM. I'm almost certain that if there's a Lester rear wheel disc brake it will not be for sale. I know that Morris mags are out there (I have a set for a pending project) and they do make a rear disc wheel for Air heads but you will need to fabricate a caliper mount. Morris mags look almost like Lesters but just a little lighter in weight and a little better looking in my opinion.

    Woodys Wheel Works is an excellent resource and vendor for custom stuff and the staff has a wealth of knowledge regarding what works and what might be a very expensive and unproductive experiment.

    I had given thought to having a disc mounting adapter made for a spoked wheel hub until I compared the stopping power of the rear disc on my R 100S and the drum brake on my R 90/6 and found that there is not much of a difference between them.

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    At one of the rallies, I saw a R90S with a rear disc brake, that the owner had adapted.
    The main reason I wanted to go with a rear disc was the final drive (imagine that) I found a brand new 32/11 final drive which I would like to install, but it is for a disc brake application.

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    Sir Darby Darryl Cainey's Avatar
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    Any final drive can be converted over to drum brakes.
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