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dasbmw
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Lansing MI
Joined: 01/03/2016
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Hi, I saved a R100/7 from the dump,frame#6146774,got it home and found a few strange things....having 32mm bings with 40mm exhaust pipes,was this something from the factory? also it has a drum rear brake but the tabs on the swing arm and frame for a disc brake, last it has a rear mag wheel that I have never seen: BMW stamped #3631-1235-667 also stamped with FPS and date stamp 77, has the open ports for brake cooling,and has old blue paint. My question is this an early R100rs rear wheel? Thanks to all who answer.

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schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6540
Welcome to the forum! I have

Welcome to the forum! I have a /7 that is a couple of thousand units before yours. Your bike is a Nov 1977 build.

I don't think that the exhaust headers were from the factory like that...I just measured mine and they are a shade under 38mm in OD. I would have thought that the /7s made at that time would have been pretty much stock. With those other changes, makes me think that the rear of the bike was in some sort of accident and other parts from an RT/RS were substituted. The number you gave is not a part number, but is some kind of special coding used by BMW possibly for tracking or a mold number.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

khittner
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Joined: 02/15/2012
Posts: 369
A picture of your rear wheel

A picture of your rear wheel would help with the identification. Early ('77) RS rear wheels were spoked with a drum brake hub and blue pinstripes around the circumference on both sides of the spoke holes.

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Konrad

dasbmw
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Lansing MI
Joined: 01/03/2016
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Ian Fallon's book BMW bible

Ian Fallon's book BMW bible states that the optional mag wheels were available for the R100rs in 1977 but only a few were sold.

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khittner
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Joined: 02/15/2012
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That's "Custom"

I've never seen an OE snowflake wheel in anything but silver, or the light gold color that they used for some of the early root beer brown and biege RTs (1979?). Some folks paint/powder coat them to suit their own tastes, so that's almost surely some PO's idea of "custom". Media blast at will.

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Konrad

dasbmw
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Lansing MI
Joined: 01/03/2016
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The color of paint is not the

The color of paint is not the concern here, identifying what this wheel came on is the question.

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schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
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Sounds like you found the

Sounds like you found the answer in Ian's book. How it got you your /7 might forever remain a mystery.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

A. S. Pels
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Joined: 09/05/2009
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Some 1977 R100RS had 40mm headers

and drum brake cast rear wheels, but the R100/7 never had the 40mm pipes . . .

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